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

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...

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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 noise and disturb the flow field; at the same time, the measurement accuracy of this method is directly affected by the measurement accuracy of the sensor, and the wind at different wind speeds obtained by calibration The tunnel drop coefficient cannot be accurately reflected in the velocity pressure correction during the wind tunnel test, which affects the measurement accuracy of the test data

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