CN118857076A - A high temperature experimental device and method for a capacitive blade tip clearance sensor with a cooling channel - Google Patents

Abstract

The invention belongs to the technical field of blade tip gap measurement, and discloses a high-temperature experimental device and a high-temperature experimental method for a capacitive blade tip gap sensor with a cooling flow channel, wherein the high-temperature experimental device for the capacitive blade tip gap sensor with the cooling flow channel comprises an installation module, a simulation module and a measurement module, the installation module is used for clamping and fixing the capacitive blade tip gap sensor with the cooling flow channel, the capacitive blade tip gap sensor with the cooling flow channel is provided with the cooling flow channel, cooling gas is introduced into the cooling flow channel to cool a probe, the temperature resistance is improved, the simulation module is used for providing an experimental environment of extreme high temperature and extreme temperature gradient of an aeroengine, and the measurement module is used for data monitoring in the experimental process; the high-temperature experimental method of the capacitive blade tip gap sensor with the cooling flow channel can be used for carrying out temperature-resistant detection on the capacitive blade tip gap sensor with the cooling flow channel through the high-temperature experimental device of the capacitive blade tip gap sensor with the cooling flow channel, and is simple and convenient to operate.

Description

A high temperature experimental device and method for a capacitive blade tip clearance sensor with a cooling channel

Technical Field

The invention relates to the technical field of blade tip clearance measurement, and in particular to a high temperature experimental device and method for a capacitive blade tip clearance sensor with a cooling flow channel.

Background Art

The tiny distance between the top of the rotor blade of an aircraft engine and the inner wall of the casing is called the tip clearance, which is one of the important parameters affecting the mechanical performance of the engine. Reducing the tip clearance can reduce fuel consumption and significantly improve operating efficiency, but too small a tip clearance value will cause the blade to rub against the casing, seriously endangering the safety of engine operation. Therefore, the tip clearance measurement technology is of great significance to improving the performance of aircraft engines and ensuring safe operation.

At present, mature methods for measuring blade tip clearance include discharge probe method, laser triangulation method, fiber bundle method, eddy current method, capacitance method and microwave method. Among them, the capacitance method is suitable for harsh environments such as high temperature and high pressure. Due to its fast response speed and high reliability, it is widely used in engineering tests of blade tip clearance. However, the performance requirements of modern aircraft engines such as high thrust-to-weight ratio and high efficiency have led to a gradual increase in the turbine inlet temperature. The working environment of the blade tip clearance sensor is becoming increasingly harsh, and has reached the limit that the sensor design material can withstand.

For extremely high temperature working environments, it is necessary to overcome the insufficient temperature resistance of sensor materials in existing technologies and design a capacitive tip clearance sensor. However, the high temperature environment inside an aircraft engine is complex. How to simulate this extremely high temperature and extremely large temperature gradient environment under laboratory conditions and verify the temperature resistance of this capacitive tip clearance sensor has become a key issue that needs to be solved urgently.

Summary of the invention

The object of the present invention is to provide a high temperature experimental device of a capacitive blade tip clearance sensor with a cooling flow channel, which has a simple structure and is easy to install.

To achieve this object, the present invention adopts the following technical solutions:

A high temperature experimental device for a capacitive blade tip clearance sensor with a cooling channel is used to perform a high temperature test on a capacitive blade tip clearance sensor with a cooling channel, comprising:

A mounting module, wherein the mounting module comprises a mounting flange, a top cover and a tube body, wherein the mounting flange is mounted on one end of the tube body, and the convex surface of the mounting flange is circumferentially connected to the inner wall of the tube body, and the top cover is sealed at the other end of the mounting flange, and the top cover is provided with a mounting hole, wherein the capacitive tip clearance sensor with a cooling flow channel is mounted inside the tube body, and a probe of the capacitive tip clearance sensor with a cooling flow channel extends into the mounting hole, and an outer wall of the probe circumferentially abuts against a hole wall of the mounting hole;

A simulation module, wherein the simulation module comprises a high-temperature furnace and a cooling pipe, the installation module extends into the furnace through the furnace hole, and the flange surface of the installation flange is placed on the outer wall of the high-temperature furnace, and the detection end of the probe is flush with the inner wall of the high-temperature furnace, one end of the cooling pipe is connected to compressed air, and the other end extends into the pipe body;

A measuring module, wherein the measuring module comprises a host computer and an oscilloscope, and both the host computer and the oscilloscope are connected to the cable.

Preferably, the capacitive tip clearance sensor with a cooling channel comprises:

A core pole, an insulating layer, an outer metal layer, a tail top ring, a cable and a mounting seat, wherein the insulating layer is sleeved on the outside of the core pole, the outer metal layer is sleeved on the outside of the insulating layer, the top of the tail top ring is circumferentially connected to the bottom of the insulating layer, the side wall of the tail top ring is circumferentially connected to the inner wall of the outer metal layer, one end of the core pole extends out of the insulating layer and extends into the tail top ring, the cable extends into the tail top ring and connects to the core pole, the mounting seat is sleeved on the outer metal layer, and a cooling channel is formed between the mounting seat and the outer metal layer, and an air inlet and an air outlet are spaced apart on the mounting seat, and the air inlet and the air outlet are both connected to the cooling channel.

Preferably, a first annular protrusion is provided at the bottom of the outer metal layer, and the first annular protrusion is circumferentially connected to the inner wall of the mounting seat. A second annular protrusion is provided at the top of the mounting seat, and the second annular protrusion is circumferentially connected to the outer wall of the outer metal layer. The outer wall of the outer metal layer, the first annular protrusion, the second annular protrusion and the inner wall of the mounting seat cooperate to form the cooling channel.

Preferably, the capacitive tip clearance sensor with a cooling channel further comprises an air inlet pipe and an air outlet pipe, one end of the air inlet pipe is connected to the air inlet, and one end of the air outlet pipe is connected to the air outlet.

Preferably, the other end of the air intake pipe is connected to a first air source, a first pressure reducing valve is arranged between the air intake pipe and the first air source, and a flow meter is installed on the air intake pipe.

Preferably, a thermocouple is installed inside the tube body.

Preferably, one end of the cooling pipe is connected to a second air source, the second air source is compressed air, and a second pressure reducing valve is arranged between the cooling pipe and the second air source.

Another object of the present invention is to provide a high temperature test method for a capacitive blade tip clearance sensor with a cooling channel, which is easy to operate.

To achieve this object, the present invention adopts the following technical solutions:

A high temperature test method for a capacitive blade tip clearance sensor with a cooling channel is provided. A high temperature test device for a capacitive blade tip clearance sensor with a cooling channel is used to perform a temperature resistance test on a capacitive blade tip clearance sensor with a cooling channel. The method comprises the following steps:

S1, calculating the ideal volume flow rate _V01 and amount of cooling gas required for the probe of the capacitive tip clearance sensor with cooling flow channel to be lower than the heat resistance temperature, and calculating the ideal volume flow rate _V02 and amount of compressed air required for the internal temperature of the pipe body to be lower than the heat resistance temperature;

S2. Assembling the capacitive tip clearance sensor high temperature experimental device with cooling channel;

S3, performing a high temperature experiment on the capacitive tip clearance sensor with a cooling channel;

S4. Analyze the experimental results.

Preferably, S3 includes:

S3.1, the high temperature furnace is heated according to the heating curve;

S3.2, when the internal temperature of the furnace reaches 600°C, cooling gas is introduced into the air inlet pipe at an ideal volume flow rate V ₀₁ ;

S3.3. When the internal temperature of the furnace reaches 600°C, compressed air is introduced into the tube body at an ideal volume flow rate _V02 to control the detection temperature of the thermocouple to be 600°C.

Preferably, S4 includes:

S4.1. During the heating process, detecting whether the leakage capacitance and leakage conductance of the capacitive tip clearance sensor with a cooling channel are within a compensable range, and whether the noise is less than the noise tolerance;

S4.2. Take out the capacitive tip clearance sensor with cooling channel and cool it down, and observe whether cracks, deformation or oxidation appear on the probe surface;

S4.3. Use a simulated blade to sweep across the detection end of the probe, and observe whether a signal waveform appears on the oscilloscope.

Beneficial effects of the present invention:

The present invention provides a high-temperature experimental device and method for a capacitive blade tip clearance sensor with a cooling flow channel. The high-temperature experimental device for a capacitive blade tip clearance sensor with a cooling flow channel comprises an installation module, a simulation module and a measurement module, wherein the installation module is used to clamp and fix a capacitive blade tip clearance sensor with a cooling flow channel, the simulation module is used to provide an experimental environment of extremely high temperature and extreme temperature gradient of an aircraft engine, and the measurement module is used to monitor data during the experiment. The capacitive blade tip clearance sensor with a cooling flow channel comprises a core pole, an insulating layer, an outer metal layer, a tail top ring, a cable and a mounting seat, the insulating layer is sleeved on the outside of the core pole, the outer metal layer is sleeved on the outside of the insulating layer, the top of the tail top ring is circumferentially connected to the bottom of the insulating layer, and the side wall of the tail top ring is circumferentially connected to the outer metal layer. The inner wall, one end of the core pole extends out of the insulating layer and extends into the tail top ring, the cable extends into the tail top ring and connects the core pole, the mounting seat is sleeved on the outer metal layer, and a cooling channel is formed between the mounting seat and the outer metal layer. The temperature is reduced by introducing cooling gas into the cooling channel to improve the temperature resistance performance; a high-temperature test method for a capacitive tip clearance sensor with a cooling channel, including calculating the ideal volume flow and amount of cooling gas required for a probe of a capacitive tip clearance sensor with a cooling channel to be lower than the heat resistance temperature, calculating the ideal volume flow and amount of cooling gas required for the internal temperature of the tube body to be lower than the heat resistance temperature, assembling a high-temperature test device for a capacitive tip clearance sensor with a cooling channel, performing a high-temperature test on a capacitive tip clearance sensor with a cooling channel, and analyzing the test results, and the operation is simple.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a capacitive blade tip clearance sensor with a cooling channel provided in Embodiment 1 of the present invention;

FIG2 is a schematic diagram of the structure of an installation module provided in Embodiment 1 of the present invention;

3 is a schematic structural diagram of a high-temperature experimental device for a capacitive tip clearance sensor with a cooling channel provided in Embodiment 1 of the present invention;

FIG4 is a flow chart of a high temperature test method for a capacitive tip clearance sensor with a cooling channel provided in a second embodiment of the present invention.

In the figure:

Core pole; 12, insulation layer; 13, outer metal layer; 14, tail top ring; 15, cable; 16, mounting seat; 161, air inlet; 162, air outlet; 17, air inlet pipe; 18, air outlet pipe; 19, first air source; 1a, first pressure reducing valve; 1b, flow meter; 1c, filter; 10, cooling channel;

211. Mounting flange; 212. Top cover; 2121. Mounting hole; 213. Pipe body; 221. High temperature furnace; 222. Cooling pipe; 223. Thermometer; 224. Thermocouple; 225. Second gas source; 226. Second pressure reducing valve; 231. Host computer; 232. Oscilloscope.

DETAILED DESCRIPTION

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

Embodiment 1 Embodiment 1 provides a high temperature experimental device for a capacitive blade tip clearance sensor with a cooling channel, which simulates the experimental environment of extremely high temperature and extreme temperature gradient of an aircraft engine and performs a temperature resistance test on a capacitive blade tip clearance sensor with a cooling channel.

Please refer to Figures 2 and 3. A high-temperature experimental device for a capacitive tip clearance sensor with a cooling channel includes an installation module, a simulation module and a measurement module. The installation module is used to clamp and fix a capacitive tip clearance sensor with a cooling channel. The simulation module is used to provide an experimental environment of extremely high temperature and extreme temperature gradient of an aircraft engine. The measurement module is used to monitor data during the experiment, such as leakage capacitance, leakage conductance and noise value.

Specifically, referring to Figure 1, a capacitive tip clearance sensor with a cooling channel includes a core pole 11, an insulating layer 12, an outer metal layer 13, a tail top ring 14 and a cable 15. The insulating layer 12 is sleeved on the outside of the core pole 11, and the outer metal layer 13 is sleeved on the outside of the insulating layer 12. The core pole 11, the insulating layer 12 and the outer metal layer 13 are coaxially arranged. Furthermore, the top of the tail top ring 14 is circumferentially connected to the bottom of the insulating layer 12, and the side wall of the tail top ring 14 is circumferentially connected to the inner wall of the outer metal layer 13. One end of the core pole 11 extends out of the insulating layer 12 and extends into the tail top ring 14. The cable 15 extends into the tail top ring 14 and is connected to the core pole 11 so as to connect external detection equipment.

Please continue to refer to Figure 1. The tail top ring 14 is U-shaped, and the opening of the tail top ring 14 is arranged at the top, and the open end faces the core pole 11, and the inner wall of the outer metal layer 13 is circumferentially provided with a groove, and the open end is embedded in the groove. The inner side of the open end is circumferentially connected to the bottom of the insulating layer 12, and the outer side of the open end is circumferentially connected to the groove wall and groove bottom of the groove.

Furthermore, a capacitive tip clearance sensor with a cooling channel also includes a mounting seat 16, which is sleeved on the outer metal layer 13, and a cooling channel 10 is formed between the mounting seat 16 and the outer metal layer 13. For example, a first annular protrusion is provided at the bottom of the outer metal layer 13, and the first annular protrusion is circumferentially connected to the inner wall of the mounting seat 16, and a second annular protrusion is provided at the top of the mounting seat 16, and the second annular protrusion is circumferentially connected to the outer wall of the outer metal layer 13, and the outer wall of the outer metal layer 13, the first annular protrusion, the second annular protrusion and the inner wall of the mounting seat 16 cooperate to form the cooling channel 10.

Furthermore, an air inlet 161 and an air outlet 162 are provided at intervals on the mounting seat 16, and the air inlet 161 and the air outlet 162 are both connected to the cooling channel 10. Preferably, the air inlet 161 and the air outlet 162 are arranged opposite to each other along the radial direction of the inner hole of the mounting seat 16, so that the cooling gas enters through the air inlet 161, rotates one circle in the cooling channel 10, and then is discharged through the air outlet 162, thereby improving the heat exchange efficiency and the temperature resistance of a capacitive tip clearance sensor with a cooling channel.

Optionally, a capacitive tip clearance sensor with a cooling channel further includes an air inlet pipe 17 and an air outlet pipe 18 , wherein one end of the air inlet pipe 17 is connected to the air inlet 161 , and one end of the air outlet pipe 18 is connected to the air outlet 162 .

Further, please refer to Figure 3, the other end of the intake pipe 17 is connected to the first gas source 19, and a first pressure reducing valve 1a is arranged between the intake pipe 17 and the first gas source 19 to control the flow rate of the cooling gas flowing into the cooling channel 10. A flow meter 1b is installed on the intake pipe 17 to compare the flow rate of the cooling gas in the actual experiment with the ideal volume flow rate _V0 calculated by simulation, so as to provide guidance for subsequent high-temperature experiments.

In order to reduce oxidation inside a capacitive tip clearance sensor with a cooling channel, nitrogen is used as the cooling gas in this embodiment. In other feasible embodiments, inert gas may also be used.

Preferably, since nitrogen has a higher dew point, in this embodiment, a filter 1c is installed at the outlet end of the first gas source 19, which, on the one hand, reduces internal oxidation of a capacitive tip clearance sensor with a cooling channel, and on the other hand, reduces the failure rate of the first pressure reducing valve 1a and the flow meter 1b.

Specifically, please continue to refer to Figure 2. The installation module includes a mounting flange 211, a top cover 212 and a tube body 213. The mounting flange 211 is installed at one end of the tube body 213, and the convex surface of the mounting flange 211 is circumferentially connected to the inner wall of the tube body 213. The top cover 212 is sealed at the other end of the mounting flange 211, and the top cover 212 is provided with a mounting hole 2121. A capacitive tip clearance sensor with a cooling channel is installed inside the tube body 213. A probe of a capacitive tip clearance sensor with a cooling channel extends into the mounting hole 2121, and the outer wall of the probe circumferentially abuts against the hole wall of the mounting hole 2121. The cable 15, the air inlet pipe 17 and the air outlet pipe 18 extend from the tube body 213 to facilitate data transmission and cooling gas circulation.

The simulation module includes a high-temperature furnace 221 and a cooling pipe 222, wherein the installation module extends into the furnace through the furnace hole of the high-temperature furnace 221, and the flange surface of the installation flange 211 is circumferentially arranged on the outer wall of the high-temperature furnace 221, one end of the cooling pipe 222 is connected to the compressed air, and the other end extends into the tube body 213 to reduce the internal temperature of the tube body 213 and simulate the ambient temperature of the outer wall of the inner casing.

It should be noted that the maximum temperature of the high-temperature furnace 221 is higher than the temperature resistance requirement of a capacitive tip clearance sensor with a cooling channel, the furnace size is larger than the maximum diameter of the installation module, and the heating power of the high-temperature furnace 221 is capable of simultaneously heating a capacitive tip clearance sensor with a cooling channel and the tube body 213 to a predetermined temperature.

Preferably, the hole length of the furnace hole is equal to the sum of the lengths of the top cover 212 and the tube body 213, and the aperture size and hole length of the mounting hole 2121 are equal to those of the probe, so as to control the end face of the detection end of the probe to be flush with the inner wall of the high-temperature furnace 221, so as to ensure that the end face temperature of the detection end is the furnace temperature, and the furnace temperature is set to the high-temperature fuel gas temperature, so as to simulate the fuel gas environment inside the inner casing and improve the simulation authenticity.

In this embodiment, a thermometer 223 is arranged in the furnace of the high-temperature furnace 221 to detect and display the furnace temperature in real time, control the heating power of the high-temperature furnace 221, and realize that the furnace temperature is the temperature of the high-temperature fuel gas.

Further preferably, a capacitive tip clearance sensor with a cooling channel is pressed against the top cover 212 by a pressure plate, and the gap between the sensor and the top cover 212 and the tube body 213 is sealed with high-temperature glue to isolate the internal and external environments of the installation module.

Optionally, a thermocouple 224 is installed inside the tube body 213. Specifically, the thermocouple 224 is installed on the cable 15 near the tail top ring 14 to monitor the internal temperature of the tube body 213 in real time to improve the simulation authenticity.

Further optionally, one end of the cooling tube 222 is connected to a second gas source 225, which is compressed air, and a second pressure reducing valve 226 is arranged between the cooling tube 222 and the second gas source 225 to control the pressure of the compressed air discharged, thereby controlling the flow rate of the compressed gas flowing into the tube body 213, so as to achieve the purpose of controlling the temperature inside the tube body 213.

The measurement module includes a host computer 231 and an oscilloscope 232 . Both the host computer 231 and the oscilloscope 232 are connected to the cable 15 . The software of the host computer 231 is used to obtain leakage capacitance parameters and leakage conductance parameters in real time, and the oscilloscope 232 is used to monitor noise parameters.

The present embodiment provides a capacitive tip clearance sensor high temperature experimental device with a cooling channel, which can simulate the experimental environment of extremely high temperature and extreme temperature gradient of an aircraft engine.

Embodiment 2 This embodiment provides a high temperature test method for a capacitive blade tip clearance sensor with a cooling channel, and uses a high temperature test device for a capacitive blade tip clearance sensor with a cooling channel to test the temperature resistance of a capacitive blade tip clearance sensor with a cooling channel.

Please refer to FIG4 , a high temperature test method of a capacitive blade tip clearance sensor with a cooling channel, comprising the following steps:

S1. Calculate the ideal volume flow rate V ₀₁ and amount of cooling gas required for the probe of a capacitive blade tip clearance sensor with a cooling channel to be lower than the heat resistance temperature, and calculate the ideal volume flow rate V ₀₂ and amount of cooling gas required for the internal temperature of the pipe body to be lower than the heat resistance temperature;

S2. Assemble a high temperature experimental device for capacitive tip clearance sensor with cooling channel;

S3. Conduct high temperature experiments on a capacitive tip clearance sensor with cooling channels;

S4. Analyze the experimental results.

Before S1 , a temperature rise curve of the high temperature furnace 221 needs to be set.

Specifically, S1 includes:

S1.1. Calculate the ideal volume flow rate V ₀₁ and amount of cooling gas required for the probe of a capacitive tip clearance sensor with cooling channel to be lower than the temperature resistance temperature;

S1.2. Calculate the ideal volume flow rate _V02 and amount of compressed air required when the internal temperature of the tube body 213 is lower than the temperature resistance temperature.

S1.1 specifically:

Using numerical simulation thermal simulation software, starting from the volume flow rate V of the cooling gas being 0, the volume flow rate of the cooling gas is slowly increased to compare the temperature changes of the probe end face, the core electrode 11, and the cable 15 of a capacitive tip clearance sensor with a cooling channel. Until the probe end face temperature is always lower than the maximum use temperature of the manufacturing material in the simulation results, the volume flow rate V is the ideal volume flow rate V ₀₁ ;

Assuming that the pressure of the cooling gas in each gas cylinder is _P1 , the volume of the gas cylinder is _V1 , and the temperature of the gas in the gas cylinder is T1, according to the flow characteristic diagram issued by the first pressure reducing valve 1a when it leaves the factory, when the volume flow is _V01 , the corresponding gas pressure is _P0 . Since the air inlet pipe 17 is long after the cooling gas is ejected, it can be considered that the temperature of the cooling gas has become the normal temperature _T0 when entering the cooling flow channel 10. Assuming that the gas in the gas cylinder and the ejected gas are both ideal gases, the time _t0 that each high-pressure gas cylinder can be used is calculated according to the ideal gas state equation as follows: ,

Furthermore, the total duration t of the cooling gas discharge can be estimated according to the temperature rise curve set by the high temperature furnace 221, and the number n of high pressure gas cylinders required for the high temperature experiment is: .

S1.2 specifically:

Using numerical simulation thermal simulation software, starting from the volume flow rate V of compressed air being 0, the volume flow rate of compressed air is slowly increased, and the temperature change inside the tube body 213 is compared. Until in the simulation results, the internal temperature of the tube body 213 is always lower than the maximum use temperature of the materials used to make the core pole 11 and the cable 15, and is always lower than the temperature of the solder joints at various locations inside a capacitive tip clearance sensor with a cooling flow channel, that is, the ambient temperature of the outer wall of the inner casing is 600°C, then the volume flow rate V is the ideal volume flow rate V ₀₂ ;

Assuming that the pressure of the compressed air in each gas cylinder is P ₁ , the volume of the gas cylinder is V ₁ , and the temperature of the gas in the gas cylinder is T ₁ , according to the flow characteristic diagram issued by the second pressure reducing valve 226 when it leaves the factory, when the volume flow is V ₀₂ , the corresponding gas pressure is P ₀ . Since the cooling pipe 222 is long after the compressed air is ejected, it can be considered that the temperature of the compressed air has become the normal temperature T ₀ when entering the tube body 213 . Assuming that the gas in the gas cylinder and the ejected gas are both ideal gases, the time t ₀ that each high-pressure gas cylinder can be used is calculated according to the ideal gas state equation as follows: ,

Furthermore, the total time t of compressed air discharge can be estimated according to the temperature rise curve set by the high temperature furnace 221, and the number n of high pressure gas cylinders required for the high temperature experiment is: .

S2 is specifically:

The mounting module is mounted on the high temperature furnace 221 through the furnace hole, and the flange surface of the mounting flange 211 is circumferentially placed on the edge of the furnace hole.

Between S2 and S3, it also includes: checking the signal of a capacitive tip clearance sensor with a cooling channel, checking the air tightness of the installation module, the simulation module, the measurement module and the interfaces of the capacitive tip clearance sensor with a cooling channel, and checking whether the flow meter 1b, the first pressure reducing valve 1a, the second pressure reducing valve 226, and the thermometer 223 can display normally.

S3 includes:

S3.1, the high temperature furnace 221 is heated according to the heating curve;

S3.2, when the internal temperature of the furnace reaches 600°C, cooling gas is introduced into the air inlet pipe 17 at an ideal volume flow rate V ₀₁ ;

S3.3. When the internal temperature of the furnace reaches 600°C, compressed air is introduced into the tube body 213 at an ideal volume flow rate V ₀₂ to control the detection temperature of the thermocouple 224 to 600°C.

That is, the high temperature furnace 221 is heated according to the set heating curve to start the high temperature experiment. The leakage capacitance, leakage conductance and noise peak-to-peak values are recorded every time the furnace temperature rises by 100°C. When the furnace temperature reaches 600°C, cooling gas is blown into the cooling flow channel 10, and the gas flow rate of the first pressure reducing valve 1a is adjusted to the ideal gas flow rate V ₀₁ . At the same time, compressed air is blown into the inside of the tube body 213, and the gas flow rate of the second pressure reducing valve 226 is adjusted to V ₀₂ , so that the temperature of the thermocouple 224 is always maintained at about 600°C.

S4 includes:

S4.1. During the heating process, detect whether the leakage capacitance and leakage conductance of a capacitive blade tip clearance sensor with a cooling channel are within the compensable range, and whether the noise is less than the noise tolerance;

S4.2. Take out a capacitive tip clearance sensor with a cooling channel and cool it down, and observe whether there are cracks, deformation or oxidation on the probe surface;

S4.3. Use a simulated blade to sweep across the detection end of the probe and observe whether a signal waveform appears on the oscilloscope 232.

If the leakage capacitance and leakage conductance are always within the compensable range during the heating process, the noise is always less than the noise tolerance, no cracks, deformation or oxidation appear on the probe surface after being taken out and cooled, and an obvious signal waveform appears on the oscilloscope 232 when a simulated blade is swept across the detection end of the probe, then the temperature resistance performance of the capacitive tip clearance sensor with a cooling channel is qualified; if any of the items does not meet the requirements, then the temperature resistance performance of the capacitive tip clearance sensor with a cooling channel is unqualified.

The high temperature test method for a capacitive blade tip clearance sensor with a cooling channel provided in this embodiment is simple to operate and can effectively verify the temperature resistance of the capacitive blade tip clearance sensor with a cooling channel.

Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A take cooling runner's capacitanc apex clearance sensor high temperature experimental apparatus for take cooling runner's capacitanc apex clearance sensor to carry out high temperature test, its characterized in that includes:

The mounting module comprises a mounting flange (211), a top cover (212) and a pipe body (213), wherein the mounting flange (211) is mounted at one end of the pipe body (213), the convex surface of the mounting flange (211) is circumferentially connected to the inner wall of the pipe body (213), the top cover (212) is plugged at the other end of the mounting flange (211), the top cover (212) is provided with a mounting hole (2121), the capacitive blade tip clearance sensor with a cooling flow channel is mounted in the pipe body (213), a probe of the capacitive blade tip clearance sensor with the cooling flow channel extends into the mounting hole (2121), and the outer wall of the probe is circumferentially abutted to the wall of the mounting hole (2121);

The simulation module comprises a high-temperature furnace (221) and a cooling pipe (222), the installation module stretches into the hearth through a furnace hole, the flange surface of the installation flange (211) is arranged on the outer wall of the high-temperature furnace (221), the detection end of the probe is flush with the inner wall of the high-temperature furnace (221), one end of the cooling pipe (222) is communicated with compressed air, and the other end of the cooling pipe stretches into the pipe body (213);

the measuring module comprises an upper computer (231) and an oscilloscope (232), wherein the upper computer (231) and the oscilloscope (232) are connected to the cable (15).

2. The capacitive tip clearance sensor high temperature experimental apparatus with cooling flow passage of claim 1, wherein the capacitive tip clearance sensor with cooling flow passage comprises:

core utmost point (11), insulating layer (12), outer metal level (13), afterbody top ring (14), cable (15) and mount pad (16), insulating layer (12) cover is located the outside of core utmost point (11), outer metal level (13) cover is located the outside of insulating layer (12), the top circumference of afterbody top ring (14) connect in the bottom of insulating layer (12), the lateral wall circumference of afterbody top ring (14) connect in the inner wall of outer metal level (13), the one end of core utmost point (11) stretches out insulating layer (12) and stretches into afterbody top ring (14), cable (15) stretch into afterbody top ring (14) and connect core utmost point (11), mount pad (16) cover is located outer metal level (13), just mount pad (16) with form cooling runner (10) between outer metal level (13), the interval is equipped with air inlet (161) and air outlet (161) with air outlet (162) in cooling runner (10) all communicate.

3. The high-temperature experimental device of the capacitive blade tip clearance sensor with the cooling flow passage according to claim 2, wherein a first annular protrusion is arranged at the bottom of the outer metal layer (13), the first annular protrusion is circumferentially connected to the inner wall of the mounting seat (16), a second annular protrusion is arranged at the top of the mounting seat (16), the second annular protrusion is circumferentially connected to the outer wall of the outer metal layer (13), and the outer wall of the outer metal layer (13), the first annular protrusion, the second annular protrusion and the inner wall of the mounting seat (16) are matched to form the cooling flow passage (10).

4. The high-temperature experimental device of a capacitive tip clearance sensor with a cooling runner according to claim 2, further comprising an air inlet pipe (17) and an air outlet pipe (18), wherein one end of the air inlet pipe (17) is connected to the air inlet (161), and one end of the air outlet pipe (18) is connected to the air outlet (162).

5. The high-temperature experimental device with the cooling runner for the capacitive blade tip clearance sensor, according to claim 4, is characterized in that the other end of the air inlet pipe (17) is communicated with a first air source (19), a first pressure reducing valve (1 a) is arranged between the air inlet pipe (17) and the first air source (19), and a flowmeter (1 b) is installed on the air inlet pipe (17).

6. The capacitive tip clearance sensor high temperature experimental device with cooling flow passage according to claim 1, wherein a thermocouple (224) is installed inside the tube body (213).

7. The high-temperature experimental device with the cooling flow passage for the capacitive tip clearance sensor according to claim 1, wherein one end of the cooling pipe (222) is communicated with a second air source (225), the second air source (225) is compressed air, and a second pressure reducing valve (226) is arranged between the cooling pipe (222) and the second air source (225).

8. A high-temperature experimental method of a capacitive blade tip clearance sensor with a cooling flow passage is characterized in that, the high-temperature test device for the capacitive blade tip gap sensor with the cooling flow channel by using the high-temperature test device for the capacitive blade tip gap sensor with the cooling flow channel, which is characterized by comprising the following steps of:

S1, calculating ideal volume flow V ₀₁ and consumption of cooling gas required by the probe of the capacitive blade tip clearance sensor with the cooling flow channel lower than the temperature resistance temperature, and calculating ideal volume flow V ₀₂ and consumption of compressed air required by the pipe body inner temperature lower than the temperature resistance temperature;

S2, assembling the high-temperature experimental device with the cooling flow channel for the capacitive blade tip gap sensor;

s3, performing a high-temperature experiment on the capacitive blade tip gap sensor with the cooling flow channel;

S4, analyzing an experimental result.

9. The method for high temperature testing of a capacitive tip clearance sensor with cooling fluidic channel of claim 8, wherein S3 comprises:

S3.1, heating and heating the high-temperature furnace (221) according to a heating curve;

S3.2, when the internal temperature of the hearth reaches 600 ℃, introducing cooling gas into the air inlet pipe (17) at an ideal volume flow V ₀₁;

And S3.3, after the internal temperature of the hearth reaches 600 ℃, introducing compressed air into the pipe body (213) at an ideal volume flow V ₀₂, and controlling the detection temperature of the thermocouple (224) to be 600 ℃.

10. The method for high temperature testing of a capacitive tip clearance sensor with cooling fluidic channel of claim 8, wherein S4 comprises:

S4.1, in the heating process, detecting whether the leakage capacitance and the leakage conductance of the capacitive blade tip gap sensor with the cooling flow channel are in a compensatory range or not, and whether noise is smaller than noise tolerance or not;

s4.2, taking out the capacitive blade tip gap sensor with the cooling flow channel, cooling, and observing whether cracks, deformation or oxidization occur on the surface of the probe;

S4.3, scanning a detection end of the probe by using an analog blade, and observing whether a signal waveform appears on the oscilloscope (232).