A design of total pressure control method for continuous transonic wind tunnel

The total pressure is the key indicator of the continuous transonic wind tunnel. The high control precision of the total pressure can improve the accuracy of the test data, and the fast adjustment speed is of great significance for shortening the time of the Mach polar curve. According to the main characteristics of the continuous transonic wind tunnel, such as the presence of various test conditions and many adjusting means of the flow field, the characteristics of the pressure regulating system and the coupling characteristics of different adjusting means for the continuous transonic wind tunnel have been analyzed firstly. Then the control precision of the total pressure and the characteristics of the regulating valve have been obtained for the continuous transonic wind tunnel. The valves combination strategy is designed according to different test conditions. Lastly the control algorithm of the segmented variable parameter combined with the fuzzy PID is used to adjust the total pressure accurately. The result of the wind tunnel test shows that while guaranteeing the time of each Mach pole curve, the total pressure control accuracy reaches 0.1% and the control strategy can adapt to the control requirement of the total pressure control for the continuous transonic wind tunnel.