高焓风洞中等离子体激励流动控制试验

Plasma-actuated flow control test in high enthalpy shock tunnel

采用等离子体流动控制改善飞行器气动性能是近年来流动控制领域研究的热点。基于爆轰驱动高焓激波风洞的高总温、高马赫数来流状态研究表面电弧放电技术对流场流动结构以及热流、压力等接触式测量方法的影响规律。结果表明:等离子体放电对双楔流动结构的影响可分为干扰激波产生以及原有激波的恢复阶段,其对流动结构的作用时间约为66.68μs;强放电对空间电势的影响导致其对热电偶以及压阻传感器等接触式方法的测量数据造成干扰,本文试验状态下的干扰时间约为200μs,远大于放电对于流动控制的作用时间;另外,采用低通滤波方法、噪声幅值以及噪声时域幅值的加权处理一定程度上可以对测量的干扰信号进行优化,并得到相对合理的试验数据,但该处理方法的正确性仍然需要更丰富的试验数据进行验证。

The use of plasma flow control to improve the aerodynamic performance of aircraft is a hot research topic in the field of flow control in recent years.In this paper,based on the high total temperature and high Mach number freestream of the detonation-driven high enthalpy shock tunnel,the influence law of surface arc discharge technology on the flow structure of the flow field and contact measurement methods,such as heat flux and pressure,are investigated.The results show that the influence of arc discharge on the double wedge flow structure can be divided into the phases of interference shock generation and recovery of the original shock,and its action time on the flow structure is about 66.68μs.The effect of arc discharge on the space potential causes interference with the measurement data of contact methods such as thermocouples and piezoresistive sensors.The interference time in the test state of this paper is about 200μs,which is much longer than the action time of the discharge on the flow.Additionally,the low-pass filtering method,the noise amplitude and the weighted processing of the noise time domain amplitude can optimize the interference signal of pressure and temperature to a certain extent and obtain relatively reasonable test data.However,the processing method still needs more abundant test data for verification.