Subsonic transonic static pressure control method suitable for intermittent high-speed wind tunnel

Abstract

The invention discloses a subsonic transonic static pressure control method suitable for an intermittent high-speed wind tunnel. According to the control method, a static pressure controller is adopted to take over wind tunnel static pressure control authority, disturbance correction of a model attack angle and static pressure serves as disturbance control quantity to be substituted into a model prediction controller of the static pressure controller, and corrected model prediction controller output quantity is obtained; and then a Mach number static pressure deviation correction algorithm is adopted to compensate the output quantity of the model prediction controller, the control deviation caused by inaccurate model and random disturbance in the model prediction control is made up, the raster indicator control quantity of the static pressure controller is finally calculated, and more accurate static pressure control is realized. By means of the control method, high-precision control over the subsonic transonic static pressure of the intermittent high-speed wind tunnel can be achieved, it is ensured that when the attack angle of the model changes in the wind tunnel test process, especially when the attack angle of the model continuously changes in the large angle range, static pressure control can be rapidly and accurately completed, and accurate control over the subsonic transonic Mach of the intermittent high-speed wind tunnel is achieved.

Description

technical field [0001] The invention belongs to the field of aerospace wind tunnel tests, and in particular relates to a sub-transonic static pressure control method suitable for temporary high-speed wind tunnels. Background technique [0002] The calculation formula of the subtransonic Mach number Ma in the temporary high-speed wind tunnel is as follows: [0003] [0004] where P o is the total pressure value in the stable section; Ps is the static pressure value in the test section. It can be seen from the formula that the change of total pressure and static pressure determines the size of Ma. Usually, the PID control method is adopted in the Ma control of this type of wind tunnel, the total pressure is controlled by adjusting the pressure of the incoming airflow through the pressure regulating valve, and the static pressure of the chamber is controlled by adjusting the throttling of the second throat through the gate finger, so as to finally To achieve the goal of p...

AI Technical Summary

Problems solved by technology

Since the continuous change of the model angle of attack during the test will bring continuous disturbance to the flow field, the current PID control method used in the temporary high-speed wind tunnel cannot ensure that the Ma control responds to the change of the angle of attack in a timely manner, resulting in the wind tunnel Ma being unable to maintain the target Within the accuracy range, it directly affects the acquisition of high-quality and high-reliability test data

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