Low-speed wind tunnel speed pressure measurement and control method based on multi-parameter pressure regression algorithm

A regression algorithm, measurement and control method technology, applied in complex mathematical operations, measurement devices, aerodynamic tests, etc., can solve the problems of the measurement accuracy of the measurement accuracy sensor, the influence of the measurement accuracy of the test data, and the influence of the velocity pressure measurement accuracy. Achieve monitoring reliability, avoid aerodynamic noise interference problems, and improve measurement accuracy.

Active Publication Date: 2022-01-11
中国航空工业集团公司哈尔滨空气动力研究所
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Problems solved by technology

[0003]At present, the current pressure measurement method in low-speed wind tunnels is generally obtained by direct measurement using the pitot tube method. On the one hand, when the model disturbance is large, the measured total pressure and static pressure are both affected. Affect the measurement accuracy of velocity pressure. On the other hand, the pitot tube will generate additional ...

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  • Low-speed wind tunnel speed pressure measurement and control method based on multi-parameter pressure regression algorithm
  • Low-speed wind tunnel speed pressure measurement and control method based on multi-parameter pressure regression algorithm
  • Low-speed wind tunnel speed pressure measurement and control method based on multi-parameter pressure regression algorithm

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Embodiment 1

[0032] A low-speed wind tunnel speed pressure measurement and control method based on multi-parameter pressure regression algorithm, as follows

[0033] (1) if figure 1 As shown, the total pressure pipe (two total pressure measurement points, respectively t1 and t2) and the total temperature sensor (two total temperature measurement points, respectively T1 and T2), there is a static pressure hole on the four wall horizontal lines or symmetric lines at the outlet of the contraction section on the same wind tunnel cross section, respectively equipped with pressure sensors (the static pressure measurement points are respectively C1, C2, C3 and C4), used to measure the static air pressure. The total pressure pipe length is 150mm, the pipe diameter is 12mm, the total pressure hole diameter is 1.2mm, the support is streamlined, and the thickness is 27mm.

[0034] The static pressure hole is embedded in the inner wall of the shrinking section of the wind tunnel in the form of a mou...

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Abstract

The invention discloses a low-speed wind tunnel speed pressure measurement and control method based on a multi-parameter pressure regression algorithm, wherein the method comprises the steps: arranging two total pressure and total temperature measurement points at the middle part of a wind tunnel contraction section or a stable section, and respectively arranging a static pressure hole in the four walls of an outlet of the contraction section, and carrying out the static pressure measurement; acquiring the total pressure and the total static pressure difference in front of an inlet of a wind tunnel test section through a block multi-path average calculation mode and are subjected to multiple times of fitting with the standard total pressure and the total static pressure difference measured in the center of the wind tunnel test section through a least square method, and establishing a relational expression between the center pressure of the test section and the pressure of a wind tunnel flow field parameter pressure measurement point under different wind speeds; finally, obtaining a test center velocity pressure based on a compressible flow theory by adopting a multi-flow-field pressure parameter pressure regression algorithm, and performing drop coefficient correction by arranging a pitot tube at the center of a test section, wherein the test section center velocity pressure is directly taken as a control object in a wind tunnel test. The real velocity pressure of the model area can be reflected more truly under the large-model and large-angle conditions, and the measurement accuracy of the incoming flow velocity pressure of the model area is improved.

Description

technical field [0001] The invention relates to a method for measuring and controlling the speed and pressure of a low-speed wind tunnel based on a multi-parameter pressure regression algorithm. Background technique [0002] In the wind tunnel test, the central speed pressure of the wind tunnel test section is a very important parameter. For example, when calculating the aerodynamic force of the test model and the pressure coefficient of the surface pressure measurement point, the accuracy of the calculation is directly related to the accuracy of the test results. , it is extremely critical to accurately determine the velocity pressure of the airflow flowing through the center of the wind tunnel test section. [0003] At present, the speed pressure measurement method in low-speed wind tunnels is generally obtained by direct measurement using the pitot tube method. On the one hand, when the model disturbance is large, the measured total pressure and static pressure are both a...

Claims

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Application Information

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IPC IPC(8): G01M9/02G06F17/18
CPCG01M9/02G06F17/18
Inventor 陈文军陈宝扬威东张旭超
Owner 中国航空工业集团公司哈尔滨空气动力研究所
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