CN111307404A - Test device and test method for internal flow field of jet fan - Google Patents

Abstract

The invention discloses a device for testing an internal flow field of a jet fan, which comprises a gas supply system, a gas vortex flowmeter, a pressure transmitter, a temperature sensor, a digital display, a data processing system, a particle generator, a laser and a camera, wherein the gas supply system is connected with the gas vortex flowmeter; the air supply system provides a pressure environment for the internal flow field of the jet flow fan; the gas vortex flowmeter, the pressure transmitter and the temperature sensor are respectively arranged between the output end of the gas supply system and the input end of the jet fan; the digital display instrument is arranged between the output end of the air supply system and the input end of the jet flow fan; the data processing system is connected with the sensor; the particle generator emits trace particles into the jet fan; the laser emits a sheet light source into the jet fan; the camera tracks the flow trajectory of the tracer particles. The invention also discloses a method for testing the internal flow field of the jet fan. The invention improves the accuracy of measuring the internal flow field characteristics of the jet flow fan.

Description

Test device and test method for internal flow field of jet fan

technical field

The invention relates to the technical field of tunnel ventilation equipment, in particular to a test device and a test method for the internal flow field of a jet fan.

Background technique

Jet fans are mainly used in urban highway tunnels and underground tunnels. Their function is to make up for the lack of natural ventilation and traffic wind, so as to ensure normal ventilation in the tunnel, discharge of pollutants in the tunnel, and ventilation and cooling in the event of a fire in the tunnel. Smoke exhaust etc.

With the continuous expansion of the tunnel scale, the ventilation energy consumption continues to increase, which increases the tunnel operation cost. In order to reduce the energy consumption of tunnel ventilation, authorized announcement number CN205805881U discloses a long-distance variable frequency ventilation system for tunnels, including a frequency converter for suppressing high-order harmonics and clutter, and the front end of the frequency converter is connected to a jet fan for ventilation, authorized announcement number CN206723081U A pneumatic tunnel jet fan is disclosed.

However, the method for measuring the speed of the jet fan in the prior art still remains at the stage of using a pitot tube, for example, the authorization announcement number CN209640374U discloses a verification device for a pitot tube flowmeter, or the stage of using an instrument such as an anemometer, as disclosed in the publication number CN108469283A The device and method for measuring the flow of an axial flow fan based on the principle of hot-wire wind speed sensing cannot accurately describe the characteristics of the internal flow field of the jet fan. Existing experimental methods (Pitot tube and hot-wire anemometer) are difficult to accurately test the internal flow field of the jet fan, let alone effectively describe the flow trajectory of the gas.

In view of this, in order to improve the accuracy of the characteristic measurement of the tunnel jet fan, the present invention proposes a test device and a test method for the internal flow field of the jet fan.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the technical problems in the above technologies at least to a certain extent. Therefore, the purpose of the present invention is to provide a test device and test method for the internal flow field of the jet fan, so as to improve the accuracy of the measurement of the characteristics of the internal flow field of the jet fan.

In order to achieve the above purpose, the first embodiment of the present invention proposes an internal flow field testing device of a jet fan, including an air supply system, a gas vortex flowmeter, a pressure transmitter, a temperature sensor, a digital display, a data processing system, Particle generators, lasers and cameras;

The air supply system provides a pressure environment for the internal flow field of the jet fan;

The gas vortex flowmeter, pressure transmitter and temperature sensor are respectively arranged between the output end of the gas supply system and the input end of the jet fan, corresponding to the volume flow of the measured gas, the starting pressure of the jet fan, and the initial temperature of the gas;

The digital display is set between the output end of the gas supply system and the input end of the jet fan, and receives the gas volume flow measured by the gas vortex flowmeter, the starting pressure of the jet fan measured by the pressure transmitter, and the initial temperature of the gas measured by the temperature sensor. , and connect with the sensor;

The data processing system is connected with the sensor, and receives the data of gas volume flow, starting pressure, and initial gas temperature transmitted by the sensor; a first pulse counter is set between the data processing system and the sensor to record the starting pressure of the jet fan, the volume flow of gas, and the initial temperature. The vector displacement of , and sent to the data processing system;

The particle generator emits tracer particles into the jet fan; the particle generators are set to two, and the two particle generators emit corresponding tracer particles into the jet fan according to the two different densities conveyed by the gas supply system;

The laser light source is sent to the jet fan;

The camera tracks the flow trajectory of the tracer particles, and records the vector displacement of the tracer particles through the second pulse counter. The second pulse counter transmits data to the data processing system, and the data processing system The vector displacement of the initial temperature and the vector displacement of the tracer particles are processed by image processing and numerical calculation to realize the performance test of the jet fan.

According to an internal flow field testing device of a jet fan according to an embodiment of the present invention, a gas vortex flowmeter, a pressure transmitter, and a temperature sensor measure the volume flow of the gas, the starting pressure of the jet fan, the initial temperature of the gas, and the first pulse The counter records the starting pressure of the jet fan, the volume flow of the gas, and the vector displacement of the initial temperature, and sends them to the data processing system; at the same time, the second pulse counter records the vector displacement of the tracer particles and transmits the data to the data processing system; the data processing system According to the starting pressure of the jet fan, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the tracer particles, image processing and numerical calculation processing are performed to realize the performance test of the jet fan, thereby improving the measurement of the internal flow field characteristics of the jet fan accuracy.

In addition, the device for testing the internal flow field of a jet fan according to the above embodiments of the present invention may also have the following additional technical features:

Further, two lasers are arranged, and the two lasers respectively emit light sources from different angles into the center, and scan the entire two-dimensional plane of the tracer particle flow in the jet fan.

Further, each laser emitting sheet light source passes through a prism and scans the entire two-dimensional plane of the tracer particle flow in the jet fan.

Further, the material of the outer wall of the jet fan is resin glass.

Further, the camera is provided with a filter.

Further, the gas supply system includes an air compressor, a high-pressure gas storage tank, a shut-off valve, a pressure gauge, a buffer gas tank and a dryer connected in series in sequence, the dryer is connected to a gas vortex flowmeter, and the high-pressure gas storage tank and the buffer gas tank are respectively Connect the safety valve, and connect the pressure relief valve in parallel on the connecting pipeline between the pressure gauge and the buffer gas tank.

Further, the gas pressure delivered by the gas supply system is 0-0.7MPa.

In order to achieve the above purpose, the second embodiment of the present invention proposes a method for testing the internal flow field of a jet fan, which includes the following steps:

1. Check the air tightness of the test device and conduct safety performance tests;

Second, the operation of the air supply system provides a pressure environment for the internal flow field of the jet fan;

3. Turn on the jet fan, adjust the air supply system to ensure the normal start of the jet fan, the pressure transmitter records the starting pressure in real time, the temperature sensor records the initial temperature in real time, and the gas vortex flowmeter records the gas volume flow in real time to ensure the normal use of the jet fan;

Fourth, turn on the digital display instrument, and transmit the above-mentioned starting pressure, initial temperature, and gas volume flow data to the data processing system through the sensor;

5. Turn on two particle generators, and input the corresponding tracer particles to the jet fan according to the two different density gases delivered by the gas supply system;

Sixth, turn on the two lasers and adjust the prism angle, so that the sheet light source emitted by the laser can scan the entire two-dimensional plane of the area to be measured by the jet fan;

7. Turn on the camera with filter to record the flow trajectory of the tracer particles in real time;

Eighth, turn on the first pulse counter to record the starting pressure of the jet fan, the volume flow of the gas, and the vector displacement of the initial temperature, and at the same time turn on the second pulse counter to record the vector displacement of the tracer particles, and send them to the data processing system;

Nine, the data processing system performs image processing and numerical calculation processing according to the starting pressure of the jet fan, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the tracer particles, so as to realize the performance test of the jet fan.

According to a method for testing the internal flow field of a jet fan according to an embodiment of the present invention, the first pulse counter records the starting pressure of the jet fan, the volume flow of the gas, and the vector displacement of the initial temperature, and sends them to the data processing system; at the same time, the second pulse The counter records the vector displacement of the tracer particles and transmits the data to the data processing system; the data processing system performs image processing and numerical value according to the starting pressure of the jet fan, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the tracer particles Computational processing to realize the performance test of the jet fan, thereby improving the accuracy of the measurement of the internal flow field characteristics of the jet fan.

Description of drawings

1 is a schematic structural diagram of an internal flow field testing device for a jet fan according to an embodiment of the present invention;

2 is a schematic structural diagram of a jet fan according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a data processing system according to an embodiment of the present invention.

Label description

Air supply system 1 Air compressor 11

High-pressure air tank 12 Shut-off valve 13

Pressure gauge 14 Buffer gas tank 15

Dryer 16 Safety valve 17

Pressure relief valve 18 Gas vortex flowmeter 2

Pressure transmitter 3 Temperature sensor 4

Digital Display 5 Data Processing System 6

Transformer 61 Particle Generator 7

Laser 8 Camera 9

Filter 91 Jet Fan 10

Sensor 20 First Pulse Counter 30

Tracer particles 40 Second pulse counter 50

Pipe 60 Prism 70.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

As shown in FIG. 1 to FIG. 3, an internal flow field testing device of a jet fan according to an embodiment of the present invention includes an air supply system 1, a gas vortex flowmeter 2, a pressure transmitter 3, a temperature sensor 4, and a digital display instrument. 5. Data processing system 6, particle generator 7, laser 8 and camera 9; air supply system 1 provides a pressure environment for the internal flow field of jet fan 10, for example, air supply system 1 can provide continuous and stable high pressure for jet fan 10 environment, so as to ensure that the jet fan 10 starts normally, and causes a low pressure or even a negative pressure area to be formed near the central axis, thereby inducing a large amount of ambient gas into the jet fan 10 .

The gas vortex flowmeter 2, the pressure transmitter 3, and the temperature sensor 4 are respectively arranged between the output end of the air supply system 1 and the input end of the jet fan 10, corresponding to the volume flow of the measured gas and the starting pressure of the jet fan 10. , the initial temperature of the gas; the digital display device 5 is arranged between the output end of the gas supply system 1 and the input end of the jet fan 10, and receives the gas volume flow measured by the gas vortex flowmeter 2 and the jet measured by the pressure transmitter 3. The fan 10 starts the pressure and the initial temperature of the gas measured by the temperature sensor 4 and is connected to the sensor 20 . The temperature sensor 4 may be a digital temperature sensor.

The data processing system 6 is connected with the sensor 20, and receives the gas volume flow rate, starting pressure, and gas initial temperature data transmitted by the sensor 20, wherein the data processing system 6 can be connected with a converter 61 to facilitate data import into the data processing system 6; the data processing system The first pulse counter 30 is set between 6 and the sensor 20 to record the starting pressure of the jet fan 10, the volume flow of the gas, and the vector displacement of the initial temperature, and send them to the data processing system 6; the particle generator 7 emits tracer particles 40 to In the jet blower 10; the particle generators 7 are set to two, and the two particle generators 7 emit corresponding tracer particles 40 into the jet blower 10 according to the two different density gases conveyed by the gas supply system 1, wherein the particle generators 7 It can be a pressurized atomized particle generator 7 ; a laser 8 emits a sheet light source into the jet fan 10 .

The camera 9 tracks the flow trajectory of the tracer particles 40, the camera 9 can be a high-definition camera 9, and records the vector displacement of the tracer particles 40 through the second pulse counter 50, and the second pulse counter 50 transmits data to the data processing system 6 , the data processing system 6 performs image processing and numerical calculation processing according to the starting pressure of the jet fan 10, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the tracer particles 40, so as to realize the performance test of the jet fan 10.

The image processing program of the data processing system 6 is used to read the flow trajectory of the tracer particles 40 captured by the high-definition camera 9, and then obtain parameters such as vector displacement, average velocity, and volume flow of the two fluids. At the same time, the performance of the jet fan 10 is calculated in real time through the volume flow of the mainstream gas obtained by the test system. The specific calculation method is as follows:

where L _Δt is the position of the tracer particle 40 at time Δt, L is the initial position of the tracer particle 40 , U _x is the component velocity of the tracer particle 40 in the x direction, U _y is the component velocity of the tracer particle 40 in the y direction , V is the volume flow of the high-pressure gas, G ₁ is the mass flow of the high-pressure gas, G ₂ is the mass flow of the low-pressure gas, G is the _total mass flow of the two fluids, and ε represents the performance of the jet fan 10 .

The gas vortex flowmeter 2, the pressure transmitter 3, and the temperature sensor 4 correspond to the measurement of the volume flow of the gas, the starting pressure of the jet fan 10, and the initial temperature of the gas. The first pulse counter 30 records the starting pressure of the jet fan 10, and the gas temperature. The vector displacement of volume flow and initial temperature is sent to the data processing system 6; at the same time, the second pulse counter 50 records the vector displacement of the tracer particles 40 and transmits the data to the data processing system 6; The starting pressure, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the tracer particles 40 are processed by image processing and numerical calculation processing, so as to realize the performance test of the jet fan 10, thereby improving the measurement of the internal flow field characteristics of the jet fan 10. precision. The present invention effectively tests the starting pressure, initial temperature, vector displacement of tracer particles 40, pulse time, and high-pressure gas volume flow parameters of the jet fan 10 through the testing system;

The velocity range that can be measured by the present invention is 0 to 1000 m/s, and the tracer particles 40 can be used to simulate the flow law of gas, so as to realize the visualization of gas flow under pressure interference conditions, and at the same time, it can obtain the starting pressure of various mainstream high-pressure gas conditions. , high pressure airflow velocity, initial temperature, volume flow and ejector airflow velocity parameters. The present invention can quantitatively test and analyze the whole process of flow, mixing and diffusion of two different densities of gases under experimental conditions such as different high-pressure gas starting pressures (0-0.7MPa) and different gas components.

When the jet fan 10 is started, the high-pressure gas enters the area to be measured by the jet fan 10 through the pipe 60, wherein the pipe 60 can be a high temperature resistant pipe, and the local speed reaches a supersonic state. The present invention proposes a test method for the entire physical process of the flow, mixing and diffusion of two gases in the jet fan 10 under different starting pressures (0-0.7MPa), gases of different densities, and different initial temperatures. During the flow process, parameters such as starting pressure, initial temperature, volume flow of mainstream high-pressure gas, vector displacement of tracer particles 40 and pulse time are tested to visualize the internal flow field characteristics of supersonic jet fan 10 .

In some examples, two lasers 8 are provided, and the two lasers 8 respectively emit light from different angles and incident into the center to scan the entire two-dimensional plane in which the tracer particles 40 flow in the jet fan 10 . Each laser 8 emits a sheet light source through the prism 70 to scan the entire two-dimensional plane in the jet fan 10 where the tracer particles 40 flow.

In some examples, the material of the outer wall of the jet fan 10 is Plexiglas. The camera 9 is provided with a filter 91 .

In some examples, the gas pressure delivered by the gas supply system 1 may be 0-0.7 MPa. The air supply system 1 includes an air compressor 11, a high-pressure air storage tank 12, a shut-off valve 13, a pressure gauge 14, a buffer air tank 15 and a dryer 16, which are connected in series. The dryer 16 is connected to the gas vortex flowmeter 2, and the high-pressure storage The gas tank 12 and the buffer gas tank 15 are respectively connected with a safety valve 17 , and a pressure relief valve 18 is connected in parallel on the connecting pipeline between the pressure gauge 14 and the buffer gas tank 15 . Among them, the air compressor 11 effectively compresses the gas to a high-pressure state, stores the high-pressure gas through the high-pressure gas storage tank 12, opens it through the safety valve 17, and prevents the excessive high-pressure gas from suddenly flooding into the area to be measured through the shut-off valve 13. The pressure gauge 14 Record the pressure in the gas supply pipeline in real time, the pressure relief valve 18 discharges excess high-pressure gas, the buffer gas tank 15 buffers the high-pressure gas to a certain extent, and the dryer 16 absorbs the moisture contained in the high-pressure gas, thereby achieving stable and continuous high pressure surroundings.

The present invention effectively controls the starting pressure of the jet fan 10 by using the high-pressure gas collecting tank 12, the shut-off valve 13, the pressure gauge 14, the buffer gas tank 15, the dryer 16, the safety valve 17 and the pressure relief valve 18, and cooperates with the pressurized atomization The type particle generator 7 effectively controls the volume flow of the tracer particles 40 .

As shown in Figures 1 to 3, the present invention also proposes a method for testing the internal flow field of a jet fan, comprising the following steps:

First, check the air tightness of the test device and conduct safety performance tests.

Second, run the air supply system 1 to provide a pressure environment for the internal flow field of the jet fan 10 .

3. Turn on the jet fan 10, adjust the air supply system 1 to ensure that the jet fan 10 starts normally, the pressure transmitter 3 records the starting pressure in real time, the temperature sensor 4 records the initial temperature in real time, and the gas vortex flowmeter 2 records the gas volume flow in real time to ensure The jet fan 10 is in normal use.

Fourth, the digital display device 5 is turned on, and the above-mentioned starting pressure, initial temperature, and gas volume flow data are transmitted to the data processing system 6 through the sensor 20 .

Fifth, turn on the two particle generators 7 , and input the corresponding tracer particles 40 to the jet fan 10 according to the two gases of different densities conveyed by the gas supply system 1 .

Sixth, turn on the two lasers 8 and adjust the angle of the prism 70 so that the sheet light source emitted by the laser 8 can scan the entire two-dimensional plane of the area to be measured by the jet fan 10 .

Seventh, the camera 9 with the filter 91 is turned on to record the flow trajectory of the tracer particles 40 in real time.

Eighth, open the first pulse counter 30 to record the starting pressure of the jet fan 10, the volume flow of the gas, the vector displacement of the initial temperature, and simultaneously open the second pulse counter 50 to record the vector displacement of the tracer particles 40, and send them to the data processing system 6 .

Nine, the data processing system 6 performs image processing and numerical calculation processing according to the starting pressure of the jet fan 10, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the tracer particles 40, so as to realize the performance test of the jet fan 10.

The first pulse counter 30 records the starting pressure of the jet fan 10, the volume flow of the gas, and the vector displacement of the initial temperature, and sends them to the data processing system 6; at the same time, the second pulse counter 50 records the vector displacement of the tracer particles 40 and transmits data. to the data processing system 6; the data processing system 6 performs image processing and numerical calculation processing according to the starting pressure of the jet fan 10, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the tracer particles 10 to realize the jet fan 10 Therefore, the accuracy of the measurement of the internal flow field characteristics of the jet fan 10 is improved.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore It should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms should not be construed as necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (8)

1. a jet fan internal flow field testing device is characterized in that: comprise air supply system, gas vortex flowmeter, pressure transmitter, temperature sensor, digital display instrument, data processing system, particle generator, laser and camera instrument; The air supply system provides a pressure environment for the internal flow field of the jet fan; The gas vortex flowmeter, pressure transmitter and temperature sensor are respectively arranged between the output end of the gas supply system and the input end of the jet fan, corresponding to the volume flow of the measured gas, the starting pressure of the jet fan, and the initial temperature of the gas; The digital display is set between the output end of the gas supply system and the input end of the jet fan, and receives the gas volume flow measured by the gas vortex flowmeter, the starting pressure of the jet fan measured by the pressure transmitter, and the initial temperature of the gas measured by the temperature sensor. , and connect with the sensor; The data processing system is connected with the sensor, and receives the data of gas volume flow, starting pressure, and initial gas temperature transmitted by the sensor; a first pulse counter is set between the data processing system and the sensor to record the starting pressure of the jet fan, the volume flow of gas, and the initial temperature. The vector displacement of , and sent to the data processing system; The particle generator emits tracer particles into the jet fan; the particle generators are set to two, and the two particle generators emit corresponding tracer particles into the jet fan according to the two different densities conveyed by the gas supply system; The laser light source is sent to the jet fan; The camera tracks the flow trajectory of the tracer particles, and records the vector displacement of the tracer particles through the second pulse counter. The second pulse counter transmits data to the data processing system, and the data processing system The vector displacement of the initial temperature and the vector displacement of the tracer particles are processed by image processing and numerical calculation to realize the performance test of the jet fan. 2. a kind of jet fan internal flow field testing device as claimed in claim 1, it is characterized in that: laser is arranged to be two, two lasers respectively emit light source incident from different angles, tracer particles flow in the scanning jet fan the entire two-dimensional plane. 3 . The device for testing the internal flow field of a jet fan according to claim 2 , wherein each laser emitting sheet light source passes through a prism and scans the entire two-dimensional plane of the tracer particle flow in the jet fan. 4 . 4 . The device for testing the internal flow field of a jet fan according to claim 1 , wherein the material of the outer wall of the jet fan is Plexiglas. 5 . 5 . The device for testing the internal flow field of a jet fan according to claim 1 , wherein the camera is provided with a filter. 6 . 6. The internal flow field testing device of a jet fan according to claim 1, wherein the air supply system comprises an air compressor, a high-pressure air storage tank, a shut-off valve, a pressure gauge, a buffer air tank and The dryer is connected to the gas vortex flowmeter, the high-pressure gas storage tank and the buffer gas tank are respectively connected to the safety valve, and the connecting pipeline between the pressure gauge and the buffer gas tank is connected to the pressure relief valve in parallel. 7 . The device for testing the internal flow field of a jet fan according to claim 6 , wherein the gas pressure delivered by the gas supply system is 0-0.7 MPa. 8 . 8. A method for testing the internal flow field of a jet fan, comprising the following steps: 1. Check the air tightness of the test device and conduct safety performance tests; Second, the operation of the air supply system provides a pressure environment for the internal flow field of the jet fan; 3. Turn on the jet fan, adjust the air supply system to ensure the normal start of the jet fan, the pressure transmitter records the starting pressure in real time, the temperature sensor records the initial temperature in real time, and the gas vortex flowmeter records the gas volume flow in real time to ensure the normal use of the jet fan; Fourth, turn on the digital display instrument, and transmit the above-mentioned starting pressure, initial temperature, and gas volume flow data to the data processing system through the sensor; 5. Turn on two particle generators, and input the corresponding tracer particles to the jet fan according to the two different density gases delivered by the gas supply system; Sixth, turn on the two lasers and adjust the prism angle, so that the sheet light source emitted by the laser can scan the entire two-dimensional plane of the area to be measured by the jet fan; 7. Turn on the camera with filter to record the flow trajectory of the tracer particles in real time; Eighth, turn on the first pulse counter to record the starting pressure of the jet fan, the volume flow of the gas, and the vector displacement of the initial temperature, and at the same time turn on the second pulse counter to record the vector displacement of the tracer particles, and send them to the data processing system; Nine, the data processing system performs image processing and numerical calculation processing according to the starting pressure of the jet fan, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the tracer particles, so as to realize the performance test of the jet fan.

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