CN117906900B - A method and device for obtaining residual ice from a rotating cap in an icing wind tunnel test - Google Patents
A method and device for obtaining residual ice from a rotating cap in an icing wind tunnel test Download PDFInfo
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- CN117906900B CN117906900B CN202410198366.8A CN202410198366A CN117906900B CN 117906900 B CN117906900 B CN 117906900B CN 202410198366 A CN202410198366 A CN 202410198366A CN 117906900 B CN117906900 B CN 117906900B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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Abstract
The application is suitable for the technical field of icing wind tunnel tests, and provides a method and a device for acquiring residual ice of a rotary cap in an icing wind tunnel test. The acquisition method comprises the steps of debugging a rotary cap cover to carry out a cloud and fog simulation test at a target rotating speed, and recording the starting moment of a cloud and fog simulation system and the ice accumulation and falling moment of the surface of the rotary cap cover; acquiring a change value of motor power; determining the optimal operation time of the cloud and fog simulation system according to the time corresponding to the maximum value of the absolute value of the power change value of the motor between the starting time of the cloud and fog simulation system and the ice deposition falling time of the surface of the rotary cap; and according to the optimal operation time, carrying out cloud and fog simulation test on the rotating cap cover without ice accumulation at a target rotating speed, and obtaining residual ice information of the rotating cap cover. According to the application, through the icing wind tunnel test of the rotating cap cover for two times, the accurate residual ice form of the surface of the rotating cap cover is obtained, the accurate residual ice information is obtained, and the accuracy of subsequent research is improved.
Description
Technical Field
The invention belongs to the technical field of icing wind tunnel tests, and particularly relates to a method and a device for acquiring residual ice of a rotary cap in an icing wind tunnel test.
Background
The icing of the aeroengine inlet part can influence the operation of the engine, so that the engine stall and efficiency are reduced, the ice removing risk exists, the ice is sucked into and damages the internal blades after falling off, and the flight safety is seriously threatened. The rotary cap is taken as one of the inlet parts of the engine, has unique rotation characteristics, and can enable ice to be more easily separated by centrifugal force, so that research on ice formation and ice prevention of the rotary cap is very intentional.
Centrifugal forces generated by the rotation of the rotating cap member may cause de-icing conditions both in the case of ice formation and de-icing of the rotating cap. The largest change of the appearance of the rotary cap is reflected on the side surface in the process of ice accumulation and ice removal of the rotary cap, so that the information of residual ice on the surface of the rotary cap after ice removal of the rotary cap is required to be collected, and the subsequent study is facilitated.
However, in the related experimental study, the residual ice information on the surface of the rotary cap is too large in error, which affects the accuracy of the subsequent study.
Disclosure of Invention
The invention aims to provide a method and a device for acquiring residual ice of a rotary cap cover in an icing wind tunnel test, which solve the technical problems in the prior art.
The invention is realized in the following way:
In a first aspect, the present application provides a method for obtaining residual ice of a rotary cap in an icing wind tunnel test, where the specific obtaining steps include: adjusting the rotating cap to a target speed Performing a cloud simulation test, and recording the starting time/>, of a cloud simulation systemAnd moment of ice deposition shedding/>, of the surface of the rotating cap; Acquisition is atMotor power at timeRelative to being atMotor power at timeChange value，Wherein, the motor is used for driving the rotary cap to rotate; according to the momentAnd momentBetween, the maximum value of the absolute value of the motor power variation valueRecordCorresponding timeDetermining the optimal operation time/>, of a cloud and mist simulation system，-; According to the optimal operation time lengthThe rotating cap without ice accumulation is enabled to rotate at the target rotating speedAnd carrying out a cloud and fog simulation test to obtain residual ice information of the rotary cap cover.
In a second aspect, the present application further provides a device for obtaining residual ice from a rotating cap in an icing wind tunnel test, where the device is configured to implement the method for obtaining residual ice provided in the first aspect, and the device includes: the recording module is used for recording the starting time of the cloud and fog simulation systemAnd moment of ice deposition shedding/>, of the surface of the rotating cap; A first acquisition module for acquiring the positionMotor power at timeRelative to being atMotor power at timeThe value of the change in (2); The determining module is used for determining the optimal operation time length/>, of the cloud and fog simulation system; And the second acquisition module is used for acquiring residual ice information of the rotary cap.
In a third aspect, the present application also provides a computer device comprising a memory, a processor and a computer program stored on the memory, the processor executing the computer program to perform the steps of the method for obtaining residual ice provided in the first aspect.
The beneficial effects of the invention are as follows:
According to the invention, the rotation speed of the rotary cap is maintained stable, so that the power of the motor connected with the rotary cap is used for reflecting the ice accumulation change of the surface of the rotary cap, the maximum change value of the power of the motor between two adjacent moments is obtained, the ice accumulation and shedding moment of the surface of the rotary cap is obtained, the optimal operation time of the cloud and fog simulation system is obtained, then the cloud and fog simulation test is carried out again in the optimal operation time, the stop moment of the cloud and fog simulation system and the ice accumulation and shedding moment of the surface of the rotary cap are overlapped, the accurate residual ice form of the surface of the rotary cap is obtained, the accurate residual ice information is obtained, the accuracy of subsequent research is improved, and the continuous operation of the cloud and fog simulation system after the ice accumulation and shedding is avoided, so that the residual ice on the surface of the rotary cap is continuously accumulated, and the accuracy of the residual ice information is affected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the embodiments of the present invention or the drawings used in the description of the prior art, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an acquisition method provided by some embodiments of the application;
FIG. 2 is a schematic illustration of a rotating cap provided in some embodiments of the present application in an icing wind tunnel;
Fig. 3 is a schematic diagram of a motor control system according to some embodiments of the present application.
In the figure: 100-ice accumulation, 200-rotating cap cover and 300-motor.
Detailed Description
The following description provides many different embodiments, or examples, for implementing different features of the invention. The elements and arrangements described in the following specific examples are presented for purposes of brevity and are provided only as examples and are not intended to limit the invention.
In the related art, the means for acquiring the ice deposition and falling time on the surface of the rotary cap is not unique, wherein most experiments adopt manual judgment, but are limited by factors such as sight obstruction, individual difference and the like, so that the acquired ice falling time is not the same even under the same test conditions, the accuracy of the acquired time is not high, and the residual ice information on the surface of the rotary cap acquired according to the acquired ice falling time is too different, so that the accuracy of subsequent researches is influenced.
In view of this, some embodiments of the present application provide a method for obtaining residual ice of a rotary cap in an icing wind tunnel test, so as to accurately determine the moment of ice deposition on the surface of the rotary cap 200 and drop off, thereby obtaining accurate residual ice information and improving the accuracy of subsequent researches.
Before the test is carried out, each system in the icing wind tunnel needs to be debugged, so that each system in the icing wind tunnel is prepared.
The method for obtaining the data according to the embodiment of the present application may be shown in fig. 1, and specific operation steps are as follows:
First, a rotating cap icing wind tunnel test is performed to obtain relevant data of the rotating cap 200 during icing and de-icing. Specifically, the rotating cap 200 is adjusted to a target rotational speed Carrying out a cloud and fog simulation test and simultaneously recording the starting moment/>, of a cloud and fog simulation systemAnd moment of ice deposition shedding/>, of the surface of the rotating cap 200. The rotating cap 200 is typically tuned to the target rotational speed/>, prior to start-up of the cloud simulation systemSo that the rotating cap 200 can rotate at the target rotational speed/>, at the initial stage of the cloud simulation testAnd the stability and the accuracy of parameters acquired in the test process are ensured. The start time of the cloud simulation system is directly obtained according to the start time of the system, the ice deposition and falling time of the surface of the rotary cap 200 needs to be manually judged, and the ice falling time is recorded when the ice deposition 100 on the surface of the rotary cap 200 falls off. And (5) completing the icing wind tunnel test of the once-rotating cap cover. And after the ice deposition is removed, shutting down the cloud and fog simulation system.
Data is collected about the rotating cap 200 during the icing wind tunnel test. The rotary cap 200 is connected to a motor 300, and the rotary cap 200 is driven to rotate by the motor 300. Since rotating cap 200 requires maintaining a target rotational speedIn operation, after ice is deposited on the surface of the rotating cap 200, the overall load of the rotating cap 200 increases, the power of the motor 300 needs to increase as the load of the rotating cap 200 increases, and once the rotating cap 200 undergoes a de-icing change, the overall load of the rotating cap 200 decreases, and the power of the motor 300 decreases. Therefore, in the acquiring method provided by some embodiments of the present application, the change of the ice 100 on the surface of the rotating cap 200 is reflected by acquiring the change value of the power of the motor, specifically, the power of the motor is acquired first, the corresponding time of the power is recorded, and then the acquisition position/>, the power is acquiredMotor power at timeRelative to being atMotor power at timeChange value，。
Acquiring starting time of cloud and fog simulation systemAnd moment of ice deposition shedding/>, of the surface of the rotating cap 200All motor power variation values in betweenObtaining the maximum value/>, of the absolute value of the motor power variation valueSince the power variation of the motor 300 is related to the ice accumulation variation of the surface of the rotary cap 200, the variation of the motor power is maximized only when the ice accumulation 100 of the surface of the rotary cap 200 is dropped in the ice accumulation test of the rotary cap, and thus, it is possible to cope with the followingCorresponding timeTo obtain ice deposition falling time/>, of the surface of the rotary cap 200Thereby determining the optimal operation time length/>, of the cloud and fog simulation system，-Providing accurate data support for the capture of residual ice.
Obtaining optimal operation time of cloud and fog simulation systemAnd then starting the next icing wind tunnel test of the rotary cap cover. As in the first test, the non-ice-accumulating rotary cap 200 was set at the target rotational speedPerforming a cloud simulation test, wherein the operation time of the cloud simulation system reachesAfter that, the ice deposition 100 on the surface of the rotary cap 200 falls off, the cloud and fog simulation system is automatically closed, residual ice is left on the surface of the rotary cap 200, residual ice information on the surface of the rotary cap 200 is obtained, and preparation is made for subsequent experiments. It should be noted that, the purpose of this test is to obtain the residual ice on the surface of the rotary cap 200, and the motor 300 connected to the rotary cap 200 and the cloud simulation system should be stopped at the same time, so as to avoid the situation that the centrifugal force generated by the rotation of the rotary cap 200 affects the form of the residual ice, and the obtained information of the residual ice is inaccurate.
It should be noted that before the cloud simulation system is started twice, each system in the icing wind tunnel needs to be debugged, so that each system in the icing wind tunnel is prepared. In order to ensure that the operation time of the cloud simulation system is different between the two tests of the rotary cap 200, other conditions are consistent, and the time when the cloud simulation system stops operating and the ice accumulation and falling time on the surface of the rotary cap 200 overlap when the rotary cap 200 performs the second test.
By using the acquisition method provided by the embodiment of the application, the ice accumulation falling time on the surface of the rotary cap 200 can be accurately acquired, so that the accurate residual ice form on the surface of the rotary cap 200 can be obtained, and the accurate residual ice information can be acquired.
In some preferred embodiments, to further capture the moment of ice accumulation shedding on the surface of the rotary cap 200, the motor 300 is actuated by the harvestCurrent data of timeAnd voltage dataThereby obtaining that the motor 300 is atMotor power at time，. The current data and the voltage data are obtained in a simple mode, the obtained data are accurate, and the corresponding moments of the data can be recorded together when the data are obtained, so that the accurate motor power/>, of the data is obtained. In addition, according to the change trend of the current and the voltage, whether the obtained power is wrong or not can be judged, and the accuracy of the power data is further verified.
In a further preferred embodiment, the rotational cap 200 is maintained at the target rotational speed at all times during the testRotating, setting two adjacent momentsAndThe interval of time length is，WhereinIn revolutions per second. Acquisition/>, in a unit time of one secondThe resolution of the motor power data changes is high, more accurate ice removing time is obtained, and the ice accumulation change rate of the surface of the rotary cap 200 in unit time can be obtained according to the motor power changes.
In the first process of the wind tunnel test of the rotary cap cover, the moment of ice accumulation falling off is obtained through artificial judgment，The larger theAndThe more motor power change data between, the more power change data is acquiredTo avoid this, in some embodiments, a video camera is used to record the rotation cap 200, the moment of start of the recording being atPreviously, by judging whether the ice deposition 100 on the surface of the rotary cap 200 falls off or not in video recording, the ice deposition falling time/>, is obtainedThereby makingMore closelyShorteningAndAnd the time duration is longer, so that overlarge data noise is avoided. By observing the video recordings, the images before and after the ice deposition 100 is fallen off can be repeatedly judged, and finally a rough ice deposition falling time is obtained, and then the accurate ice falling time is obtained by matching with the change of the power of the motor.
In addition, the ice removing time is obtained through the change of the power of the motorThereafter, according toThe video recording is observed again, and the method is inIn the video picture corresponding to the moment, whether the ice deposition 100 on the surface of the rotary cap 200 falls off is verified, and if the ice deposition 100 falls off, the next step can be executed, and the next cloud and mist simulation test of the rotary cap 200 can be started. If the ice accumulation 100 does not fall off, it indicates that an error has occurred in the motor power data or an error has occurred in the comparison of the motor power change values, and an abnormal alarm message needs to be output to remind an operator to troubleshoot the fault, and after the fault is cleared, the method provided in the embodiment can be reused to obtain the residual ice information on the surface of the rotary cap 200.
In some embodiments of the present application, the rotary cap 200 is of a conical structure, the rotary cap 200 is connected to the motor 300 using a connection shaft, and the incoming flow direction of the mist in the mist simulation test is parallel to the rotation axis of the rotary cap 200, as shown with reference to fig. 2. In the experiment, the incoming flow mist collides with the cap cover, ice is continuously accumulated on the surface of the cap cover, and the ice is uniformly distributed in the circumferential direction and is unevenly axially characterized because the cap cover is conical. In addition, in order to achieve the effect of reducing ice accumulation, the cap cover adopts anti-icing means such as hot air, air blowing and the like, and the centrifugal force of the rotary cap cover 200 is combined, so that the possibility of falling off of the ice 100 on the surface is increased, and residual ice still remains, therefore, the acquisition method provided by the embodiment can acquire accurate information of the residual ice, and the accuracy of subsequent research tests is improved.
In some embodiments of the present application, referring to fig. 3, the motor 300 is controlled by a motor control system, the motor 300 is connected with a frequency converter and an encoder, a controller is connected between the frequency converter and the encoder, the encoder is used for measuring the rotation speed of the motor 300 and transmitting the rotation speed control command to the controller, the controller sends the rotation speed control command to the frequency converter to realize target rotation speed adjustment, so as to form closed loop control, and meanwhile, the controller transmits the rotation speed to the data acquisition device. The data acquisition device is used for acquiring parameter data such as current, voltage and the like of the operation of the motor 300. The data acquisition equipment is connected with a computer, and the computer gathers all data to obtain test data such as current, voltage, rotating speed, spraying time of the cloud and fog simulation system and the like.
Some embodiments of the present application further provide a device for acquiring residual ice of a rotating cap 200 in an icing wind tunnel test, where the method for acquiring residual ice is provided in any one of the foregoing embodiments, and the acquiring device includes: the recording module is used for recording the starting time of the cloud and fog simulation systemAnd moment of ice deposition shedding/>, of the surface of the rotating cap 200; A first acquisition module for acquiring the positionMotor power at timeRelative to being atMotor power at timeChange value; The determining module is used for determining the optimal operation time length/>, of the cloud and fog simulation system; And a second acquisition module for acquiring information of the residual ice of the rotary cap 200.
Some embodiments of the present application also provide a computer device comprising a memory, a processor and a computer program stored on the memory, the processor executing the computer program to implement the steps of the acquisition method provided in any of the embodiments described above.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. The method for acquiring the residual ice of the rotary cap cover in the icing wind tunnel test is characterized by comprising the following specific acquisition steps of:
Adjusting the rotating cap to a target speed Performing a cloud simulation test, and recording the starting time/>, of a cloud simulation systemAnd moment of ice deposition shedding/>, of the surface of the rotating cap；
Acquiring atMotor power at timeRelative to being atMotor power at timeThe value of the change in (2)，Wherein, the motor is used for driving the rotary cap to rotate;
According to the moment of time And momentBetween, the maximum value of the absolute value of the motor power variation valueRecordingCorresponding timeDetermining the optimal operation time/>, of a cloud and mist simulation system，-；
According to the optimal operation time lengthThe rotating cap without ice accumulation is enabled to rotate at the target rotating speedAnd carrying out a cloud and fog simulation test to obtain residual ice information of the rotary cap cover.
2. The method for obtaining residual ice of a rotating cap in an icing wind tunnel test according to claim 1, wherein said obtaining is performed byMotor power at timeComprising:
collecting the motor at Current data of timeAnd voltage data，。
3. A method of harvesting residual ice of a rotating cap in an icing wind tunnel test according to claim 1 or 2, wherein said harvesting step further comprises:
video recording of a rotating cap using a video camera, the moment of opening of the video recording being at Before;
judging whether ice accumulation on the surface of the rotary cap cover in video recording drops off or not, and acquiring ice accumulation drop-off time 。
4. A method for obtaining residual ice of a rotary cap in an icing wind tunnel test according to claim 3, wherein,
At the position ofIn the video recording at the moment, verifying whether the accumulated ice on the surface of the rotary cap cover falls off or not, if the accumulated ice falls off, executing the next step, and if the accumulated ice does not fall off, outputting abnormal alarm information.
5. A method for acquiring residual ice of a rotary cap in an icing wind tunnel test according to claim 1 or 2, wherein,
Adjacent two momentsAndThe interval of time length is，WhereinIn revolutions per second.
6. The method for obtaining residual ice of a rotary cap in an icing wind tunnel test according to claim 1, wherein a cloud flow direction in the cloud simulation test is parallel to a rotation axis of the rotary cap.
7. The method for obtaining residual ice of a rotary cap in an icing wind tunnel test according to claim 1, wherein the rotary cap rotates at a target speedPerforming a cloud simulation test, comprising: the ice accumulation on the surface of the rotary cap cover is increased, the power of the motor is increased, the ice accumulation on the surface of the rotary cap cover is reduced, and the power of the motor is reduced.
8. The method for obtaining residual ice of a rotary cap in an icing wind tunnel test according to claim 1, wherein the rotary cap has a conical structure.
9. A residual ice harvesting device for rotating caps in icing wind tunnel tests, characterized in that it is adapted to implement the method according to any one of claims 1-8, said harvesting device comprising:
The recording module is used for recording the starting time of the cloud and fog simulation system And moment of ice deposition shedding/>, of the surface of the rotating cap；
A first acquisition module for acquiring that the first acquisition module is inMotor power at timeRelative to being atMotor power at timeChange value；
A determining module for determining the optimal operation time of the cloud and fog simulation system；
And the second acquisition module is used for acquiring residual ice information of the rotary cap.
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| CN118150170B (en) * | 2024-05-09 | 2024-07-12 | 中国空气动力研究与发展中心低速空气动力研究所 | Support test device for fairing |
| CN119714117A (en) * | 2024-12-20 | 2025-03-28 | 西安交通大学 | Binocular vision-based cloud and fog field icing ice shape online measurement method and device |
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