2m超声速风洞流场变速压控制方法研究

Study on varying dynamic pressure control of flow field in 2m supersonic wind tunnel

颤振试验要求风洞必须具备变速压试验能力,为此在2 m超声速风洞开展了流场变速压控制方法研究。针对总压宽范围多阶梯运行时主调压阀调节能力不一致的问题,采用总压分组、误差分段的控制方法解决了这一难题。通过基于主调压阀阀门特性曲线的控制方法,实现了总压上升速率可调的目标,避免了复杂的控制参数整定过程,显著减少了调试车次。试验结果表明:采用该控制方法,一次试验可以完成多个总压阶梯的控制,并且总压稳定精度达0.3%,速压超调量小于0.5 kPa,总压上升速率可调。通过本文工作,2 m超声速风洞具备了变速压试验能力,并成功应用于型号试验。

The flutter test requires that the wind tunnel must have the capability of varying dynamic speed pressure.Therefore,the flow field control method was studied in the 2 m supersonic wind tunnel.For the problem that the regulating characteristics of the main pressure regulating valve are not consistent when the total pressure is running in a wide range of steps,the method of the total pressure grouping and error segmentation control is adopted to solve the problem.The control method based on the characteristic curve of the main pressure regulating valve is adopted to meet the requirements of adjustable total pressure rise rate,which avoids the process of setting control parameters and requires fewer times of debugging.Test results show that the method can complete multiple total pressure control in a test,the main pressure stable precision reaches 0.3%,the overshoot of the dynamic pressure is less than 0.5 kPa,and the total pressure rise rate is adjustable.The 2 m supersonic wind tunnel has the capability of varying dynamic speed pressure,and has been successfully applied in the model test.