Automatic determination method and device for steady-state data acquisition conditions in compressor performance tests

Abstract

The present invention relates to an automatic determination method and a determination device for steady-state data acquisition conditions in a compressor performance test. The automatic determination method includes step S1 of calculating a first determination parameter C1, and if C1 is less than a first threshold value, it is determined that the first determination criterion is satisfied; the first determination parameter C1 is defined according to the isentropic efficiency calculation formula and the isentropic efficiency average value calculation formula; step S2 of calculating a second determination parameter C2, and if C2 is less than a second threshold value, it is determined that the second determination criterion is satisfied; the second determination parameter C2 is defined according to the calculation formula of the standard deviation of the measured data of the isentropic efficiency; step S3 of determining that the steady-state data acquisition conditions are met. Through the automatic determination method and the determination device for steady-state data acquisition conditions in a compressor performance test provided by the present invention, real-time automatic determination of whether the steady-state data acquisition conditions are met during the compressor performance test is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine testing, and particularly relates to an automatic determination method and a determination device for steady-state data acquisition conditions in a compressor performance test. Background Art

[0002] During the development process of an aero-engine, by conducting a compressor performance test, characteristic lines at different speeds are acquired to verify the aerodynamic design of the compressor. During the test, the compressor operating conditions are adjusted by adjusting the speed, the opening of the exhaust valve, the angle of the adjustable stator vane, the opening of the bleed valve, and the opening of the intake valve. After the compressor reaches the target operating condition, the test data under this condition is acquired through a data acquisition system. In order to make the test data effectively represent the performance of the compressor, after the adjustment of the compressor operating conditions is completed, usually the following two methods are adopted to determine whether the conditions for acquiring data are met.

[0003] Specify a stable time. The stable time of the parameters is related not only to the time for the compressor operating state to reach stability, but also to the test conditions. For example, the inner diameter and length of the pressure guiding pipe will affect the time delay of pressure measurement. Therefore, under different test conditions, the stable time required before acquiring data for the compressor is different. If the stable time is too short, the uncertainty of the test data will increase. If the stable time is too long, the test time will be prolonged and test resources will be wasted.

[0004] Observe the aerodynamic parameters. Due to various random effects, even when the compressor operating state reaches stability, there are still certain fluctuations in the aerodynamic parameters, and the fluctuation amplitudes of different parameters under different operating conditions are also different. Judging whether the conditions for data acquisition are met by means of manual observation not only greatly increases the workload of the test personnel, but also inevitably affects by subjective factors. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an automatic determination method and a determination device for steady-state data acquisition conditions in a compressor performance test, realizing real-time automatic determination of whether the conditions for steady-state data acquisition are met during the compressor performance test.

[0006] To solve the above technical problem, the present invention provides an automatic determination method for steady-state data acquisition conditions in a compressor performance test, including:

[0007] Step S1, calculate a first determination parameter C1. If C1 is less than a first threshold, it is determined that the first determination criterion is met;

[0008] According to the isentropic efficiency calculation formula and the isentropic efficiency average value calculation formula, define the first determination parameter C1:

[0009]

[0010] Among them, represents the average value of the isentropic efficiency within the current time interval, represents the average value of the isentropic efficiency within the previous time interval;

[0011] Step S2, calculate the second determination parameter C2. If C2 is less than the second threshold, it is determined that the second determination criterion is met;

[0012] According to the calculation formula of the standard deviation of the measurement data of the isentropic efficiency, define the second determination parameter C2:

[0013] C2 = S c (η);

[0014] Among them, S c (η) represents the standard deviation of the isentropic efficiency within the current time interval;

[0015] Step S3, if both the first determination criterion and the second determination criterion are met simultaneously, it is determined that the steady-state data acquisition condition is met.

[0016] According to an embodiment of the present invention, the isentropic efficiency calculation formula:

[0017]

[0018] In the formula, P in represents the total pressure at the inlet of the compressor, P ex represents the total pressure at the outlet of the compressor, T in represents the total temperature at the inlet of the compressor, T ex represents the total temperature at the outlet of the compressor, γ c represents the specific heat ratio.

[0019] According to an embodiment of the present invention, the average value calculation formula of the isentropic efficiency:

[0020]

[0021] In the formula, η k represents the single measurement value of the isentropic efficiency, represents the average measurement value of the isentropic efficiency.

[0022] According to an embodiment of the present invention, the calculation formula of the standard deviation of the measurement data:

[0023]

[0024] Among them, s(η) represents the standard deviation of the measurement data of the isentropic efficiency, η k represents the single measurement value of the isentropic efficiency, represents the average measurement value of the isentropic efficiency.

[0025] The present invention also provides an automatic determination device for steady-state data acquisition conditions in a compressor performance test, including:

[0026] An HMI module, including data channel setting and determination threshold setting, where the determination threshold setting is used to determine a first threshold and a second threshold;

[0027] A data acquisition module that acquires data on the total pressure at the compressor inlet, the total temperature at the compressor inlet, the total pressure at the compressor outlet, and the total temperature at the compressor outlet;

[0028] A data processing module, connected to the HMI module and the data acquisition module, calculates the isentropic efficiency characterizing the stable state of the compressor based on the data acquired by the data acquisition module; obtains the isentropic efficiency data within the current time interval and the previous time interval through an associated channel according to the data channels of the HMI module; calculates a first determination parameter and a second determination parameter based on the isentropic efficiency characterizing the stable state of the compressor, the isentropic efficiency data within the current time interval and the previous time interval;

[0029] The first determination parameter C1: The second determination parameter C2: C2 = S c (η);

[0030] Wherein, represents the average value of the isentropic efficiency within the current time interval, represents the average value of the isentropic efficiency within the previous time interval; wherein, S c (η) represents the standard deviation of the isentropic efficiency within the current time interval;

[0031] Compare the first determination parameter C1 with the first threshold, compare the second determination parameter C2 with the second threshold, and form a determination result.

[0032] According to an embodiment of the present invention, the formula for calculating the isentropic efficiency:

[0033]

[0034] In the formula, P in represents the total pressure at the compressor inlet, P ex represents the total pressure at the compressor outlet, T in represents the total temperature at the compressor inlet, T ex represents the total temperature at the compressor outlet, γ c represents the specific heat ratio;

[0035] The formula for calculating the average value of the isentropic efficiency:

[0036]

[0037] In the formula, η k represents the single measurement value of the isentropic efficiency, Represents the measured average value of the isentropic efficiency;

[0038] Calculation formula for the standard deviation of measurement data:

[0039]

[0040] Wherein, S(η) represents the standard deviation of the isentropic efficiency measurement data, η k Represents the single measurement value of the isentropic efficiency, Represents the measured average value of the isentropic efficiency.

[0041] According to an embodiment of the present invention, the automatic determination device further includes a data storage module, connected to the data acquisition module, and the data storage module is used to store the isentropic efficiency data within the current time interval and the previous time interval, and the data processing module obtains the isentropic efficiency data within the current time interval and the previous time interval through the data storage module according to the data channel of the HMI module.

[0042] According to an embodiment of the present invention, the automatic determination device further includes a pressure scanning valve and a temperature scanning valve connected to the data acquisition module, and the data acquisition module obtains the data of the total pressure at the compressor inlet, the total temperature at the compressor inlet, the total pressure at the compressor outlet, and the total temperature at the compressor outlet through the pressure scanning valve and the temperature scanning valve.

[0043] According to an embodiment of the present invention, the automatic determination device further includes a visualization module, connected to the data processing module, and the visualization module is used to display the determination result of the data processing module.

[0044] An automatic determination method and determination device for steady-state data acquisition conditions in a compressor performance test provided by the present invention realize the real-time automatic determination of whether the steady-state data acquisition conditions are met during the compressor performance test, solve the contradiction between the waste of test resources due to too long stable time and the impact on the quality of test data due to insufficient stable time, and ensure the consistency of test data quality while improving test efficiency.

[0045] It should be understood that the above general description and the following detailed description of the present invention are both exemplary and explanatory, and are intended to provide further explanation for the present invention as claimed. Brief Description of the Drawings

[0046] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the drawings, wherein:

[0047] Figure 1 Shows the flowchart of the automatic determination method for steady-state data acquisition conditions in a compressor performance test according to an embodiment of the present invention;

[0048] Figure 2 Shows a schematic structural diagram of an automatic determination device for steady-state data acquisition conditions in a compressor performance test in an embodiment of the present invention;

[0049] Among them, the above-mentioned drawings include the following reference numerals:

[0050] Automatic determination device 100 HMI module 101

[0051] Data acquisition module 102 Data processing module 103

[0052] Data storage module 104 Pressure scanning valve 105

[0053] Temperature scanning valve 106 Visualization module 107 Detailed implementation manners

[0054] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention is provided in conjunction with the accompanying drawings.

[0055] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0056] As shown in this application and the claims, unless the context clearly indicates an exception, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0057] When detailing the embodiments of the present application, for ease of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present application here. In addition, in actual production, three-dimensional spatial dimensions of length, width, and depth should be included.

[0058] For ease of description, spatial relationship terms such as "below", "beneath", "lower", "under", "above", "on", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relationship terms are intended to encompass other orientations of the device in use or operation, in addition to the orientations depicted in the drawings. For example, if the device in the drawings is flipped, the orientation of an element described as "below" or "beneath" or "under" other elements or features will be changed to "above" the other elements or features. Thus, the exemplary terms "below" and "under" can encompass both upward and downward directions. The device may also have other orientations (rotated 90 degrees or in other directions), and thus the spatial relationship descriptive terms used herein should be interpreted accordingly. In addition, it will also be understood that when a layer is referred to as being "between" two layers, it may be the only layer between the two layers, or there may also be one or more intervening layers.

[0059] In the context of the present application, the structure in which the first feature is "above" the second feature as described may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0060] Figure 1 The flowchart of the method for automatically determining the steady-state data acquisition conditions of the compressor performance test according to an embodiment of the present invention is shown. As shown in the figure, the present invention provides a method for automatically determining the steady-state data acquisition conditions of the compressor performance test, specifically including:

[0061] Step S1, calculate the first determination parameter C1. If C1 is less than the first threshold, it is determined that the first determination criterion is satisfied. According to the isentropic efficiency calculation formula and the isentropic efficiency average value calculation formula, define the first determination parameter C1:

[0062]

[0063] wherein, represents the average value of the isentropic efficiency within the current time interval, represents the average value of the isentropic efficiency within the previous time interval. If T0 represents the current moment, the current time interval refers to [T0 - ΔT, T0], and the previous time interval refers to [T0 - 2ΔT, T0 - ΔT].

[0064] Step S2, calculate the second determination parameter C2. If C2 is less than the second threshold, it is determined that the second determination criterion is satisfied. According to the calculation formula of the standard deviation of the measurement data of the isentropic efficiency, define the second determination parameter C2:

[0065] C2 = S c (η)

[0066] Among them, S c (\(\eta\)) represents the standard deviation of the isentropic efficiency within the current time interval;

[0067] In step S3, if both the first determination criterion and the second determination criterion are satisfied, it is determined that the conditions for recording the steady-state data of the air compressor performance test are met.

[0068] Preferably, the formula for calculating the isentropic efficiency:

[0069]

[0070] In the formula, P in represents the total pressure at the inlet of the compressor, P ex represents the total pressure at the outlet of the compressor, T in represents the total temperature at the inlet of the compressor, T ex represents the total temperature at the outlet of the compressor, \(\gamma\) c represents the specific heat ratio, which is corrected according to the temperatures at the inlet and outlet of the compressor.

[0071] Preferably, the formula for calculating the average value of the isentropic efficiency:

[0072]

[0073] In the formula, \(\eta\) k represents the single measurement value of the isentropic efficiency, represents the average measurement value of the isentropic efficiency.

[0074] Preferably, the formula for calculating the standard deviation of the measurement data:

[0075]

[0076] Among them, S(\(\eta\)) represents the standard deviation of the measurement data of the isentropic efficiency, \(\eta\) k represents the single measurement value of the isentropic efficiency, represents the average measurement value of the isentropic efficiency.

[0077] Figure 2 The structural schematic diagram of the automatic determination device for the steady-state data recording conditions of the air compressor performance test in an embodiment of the present invention is shown. As shown in the figure, the present invention also provides an automatic determination device 100 for the steady-state data recording conditions of the air compressor performance test. The automatic determination device 100 mainly includes an HMI module 101, a data acquisition module 102, and a data processing module 103.

[0078] Among them, the HMI module 101 includes data channel setting and determination threshold setting, and the determination threshold setting is used to determine the first threshold and the second threshold.

[0079] The data acquisition module 102 acquires the data of the total pressure at the compressor inlet, the total temperature at the compressor inlet, the total pressure at the compressor outlet, and the total temperature at the compressor outlet.

[0080] The data processing module 103 is connected to the HMI module 101 and the data acquisition module 102. The data processing module 103 calculates the isentropic efficiency characterizing the stable state of the compressor according to the data collected by the data acquisition module 102; obtains the isentropic efficiency data within the current time interval and the previous time interval through the associated channel according to the data channel of the HMI module 101; calculates the first determination parameter and the second determination parameter according to the isentropic efficiency characterizing the stable state of the compressor, the isentropic efficiency data within the current time interval and the previous time interval.

[0081] The first determination parameter C1: The second determination parameter C2: C2 = S c (η);

[0082] Where, represents the average value of the isentropic efficiency within the current time interval, represents the average value of the isentropic efficiency within the previous time interval; where, S c (η) represents the standard deviation of the isentropic efficiency within the current time interval.

[0083] Compare the first determination parameter C1 with the first threshold, compare the second determination parameter C2 with the second threshold, and form a determination result. If the first determination parameter C1 is less than the first threshold and the second determination parameter C2 is less than the second threshold, the determination result output is 1, otherwise the determination result output is 0. Where the determination result output is 1, indicating that the steady-state data acquisition condition for the compressor performance test is met.

[0084] Preferably, the formula for calculating the isentropic efficiency:

[0085]

[0086] In the formula, P in represents the total pressure at the compressor inlet, P ex represents the total pressure at the compressor outlet, T in represents the total temperature at the compressor inlet, T ex represents the total temperature at the compressor outlet, γ c represents the specific heat ratio.

[0087] The formula for calculating the average value of the isentropic efficiency:

[0088]

[0089] In the formula, η k represents the single measurement value of the isentropic efficiency, represents the average measurement value of the isentropic efficiency.

[0090] Calculation formula for the standard deviation of measurement data:

[0091]

[0092] Among them, S(η) represents the standard deviation of the measurement data of the isentropic efficiency, and η k represents the single measurement value of the isentropic efficiency, represents the average measurement value of the isentropic efficiency.

[0093] Preferably, the automatic determination device 100 for the steady-state data acquisition conditions of the compressor performance test further includes a data storage module 104. The data storage module 104 is connected to the data acquisition module 102. The data storage module 104 is used to store the isentropic efficiency data within the current time interval and the previous time interval. The data processing module 103 obtains the isentropic efficiency data within the current time interval and the previous time interval through the data storage module 104 according to the data channel of the HMI module 101.

[0094] Preferably, the automatic determination device 100 for the steady-state data acquisition conditions of the compressor performance test further includes a pressure scanning valve 105 and a temperature scanning valve 106 connected to the data acquisition module 102. The data acquisition module 102 obtains the data of the total pressure at the compressor inlet, the total temperature at the compressor inlet, the total pressure at the compressor outlet, and the total temperature at the compressor outlet through the pressure scanning valve 105 and the temperature scanning valve 106.

[0095] Preferably, the automatic determination device 100 for the steady-state data acquisition conditions of the compressor performance test further includes a visualization module 107. The visualization module 107 is connected to the data processing module 103, and the visualization module 107 is used to display the determination result of the data processing module 103. For example, the visualization module 107 may include an LED light. When the determination result is 1, the LED light shows green; when the determination result is 0, the LED light shows red.

[0096] The automatic determination method and its determination device for the steady-state data acquisition conditions of the compressor performance test provided by the present invention realize the real-time automatic determination of whether the steady-state data acquisition conditions are met during the compressor performance test, solve the contradiction between the waste of test resources due to too long stable time and the impact on the quality of test data due to insufficient stable time, ensure the consistency of the quality of test data while improving the test efficiency, and provide a technical solution for optimizing the test process.

[0097] Although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications of the above embodiments are within the scope of the spirit of the present invention, they will fall within the scope of the claims of this application.

Claims

1. An automatic determination method for steady-state data acquisition conditions in a compressor performance test, comprising: Step S1, calculating a first determination parameter C1. If C1 is less than a first threshold, it is determined that the first determination criterion is met; According to the isentropic efficiency calculation formula and the isentropic efficiency average value calculation formula, defining the first determination parameter C1: Among them, represents the average isentropic efficiency within the current time interval, represents the average isentropic efficiency within the previous time interval; Step S2, calculating a second determination parameter C2. If C2 is less than a second threshold, it is determined that the second determination criterion is met; According to the calculation formula for the standard deviation of the measured data of isentropic efficiency, defining the second determination parameter C2: C2 = S c (η); Among them, S c (η) represents the standard deviation of the isentropic efficiency within the current time interval; Step S3, if both the first determination criterion and the second determination criterion are met simultaneously, it is determined that the steady-state data acquisition conditions are met.

2. The automatic determination method for steady-state data acquisition conditions of a compressor performance test according to claim 1, characterized in that The isentropic efficiency calculation formula: In the formula, P in represents the total pressure at the compressor inlet, P ex represents the total pressure at the compressor outlet, T in represents the total temperature at the compressor inlet, T ex represents the total temperature at the compressor outlet, and γ c represents the specific heat ratio.

3. The automatic determination method for the steady-state data acquisition conditions of the compressor performance test according to claim 1, characterized in that, The isentropic efficiency average value calculation formula: where η k represents a single measured value of the isentropic efficiency, represents the average measured value of the isentropic efficiency.

4. The automatic determination method for the steady-state data acquisition conditions of the compressor performance test according to claim 1, wherein, The calculation formula for the standard deviation of the measured data: Among them, s(η) represents the standard deviation of the isentropic efficiency measurement data, and η k represents the single measurement value of the isentropic efficiency, and represents the average measurement value of the isentropic efficiency.

5. An automatic determination device for steady-state data acquisition conditions in a compressor performance test, comprising: An HMI module, including data channel setting and determination threshold setting, where the determination threshold setting is used to determine the first threshold and the second threshold; A data acquisition module, obtaining data on the total pressure at the compressor inlet, the total temperature at the compressor inlet, the total pressure at the compressor outlet, and the total temperature at the compressor outlet; A data processing module, connected to the HMI module and the data acquisition module, calculating the isentropic efficiency characterizing the stable state of the compressor according to the data collected by the data acquisition module; obtaining the isentropic efficiency data within the current time interval and the previous time interval through an associated channel according to the data channel of the HMI module; calculating the first determination parameter and the second determination parameter based on the isentropic efficiency characterizing the stable state of the compressor, the isentropic efficiency data within the current time interval and the previous time interval; The first determination parameter C1: The second determination parameter C2: C2 = S c (η); Among them, represents the average value of the isentropic efficiency within the current time interval, represents the average value of the isentropic efficiency within the previous time interval; among them, S c (η) represents the standard deviation of the isentropic efficiency within the current time interval; Comparing the first determination parameter C1 with the first threshold, and comparing the second determination parameter C2 with the second threshold to form a determination result.

6. The automatic determination device for the steady-state data acquisition conditions of the compressor performance test according to claim 5, characterized in that, The isentropic efficiency calculation formula: Where, P in represents the total pressure at the compressor inlet, and P ex represents the total pressure at the compressor outlet, T in represents the total temperature at the compressor inlet, and T ex represents the total temperature at the compressor outlet, and γ c represents the specific heat ratio; The isentropic efficiency average value calculation formula: where η k represents a single measured value of the isentropic efficiency, represents the measured average value of the isentropic efficiency; The calculation formula for the standard deviation of the measured data: Among them, S(η) represents the standard deviation of the measured data of the isentropic efficiency, and η k represents the single measured value of the isentropic efficiency, and represents the average measured value of the isentropic efficiency.

7. The automatic determination device for the steady-state data acquisition conditions of the compressor performance test according to claim 5, characterized in that It further includes a data storage module, connected to the data acquisition module. The data storage module is used to store the isentropic efficiency data within the current time interval and the previous time interval, and the data processing module obtains the isentropic efficiency data within the current time interval and the previous time interval through the data storage module according to the data channel of the HMI module.

8. The automatic determination device for the steady-state data acquisition conditions of the compressor performance test according to claim 7, characterized in that It further includes a pressure scanning valve and a temperature scanning valve connected to the data acquisition module. The data acquisition module obtains data on the total pressure at the compressor inlet, the total temperature at the compressor inlet, the total pressure at the compressor outlet, and the total temperature at the compressor outlet through the pressure scanning valve and the temperature scanning valve.

9. The automatic determination device for the steady-state data acquisition conditions of the compressor performance test according to claim 7, characterized in that, It further includes a visualization module, connected to the data processing module. The visualization module is used to display the determination result of the data processing module.

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