基于快速响应PSP技术的跨声速脉动压力实验研究

利用快速响应压敏涂料(PSP)技术对弹箭类飞行器跨声速段的脉动压力特性开展风洞实验研究,获得了Ma=0.8～1.2范围内弹箭类飞行器全表面1.2s实验时间段内的脉动压力特性,较全面地研究了马赫数、攻角(舵偏角)对脉动压力分布特性的影响。实验结果表明,快速响应PSP技术的脉动压力测量结果与高精度脉动压力传感器结果较为吻合,均方根脉动压力系数的测量误差小于15%,精度要求满足工程设计使用,且快速响应PSP测量方式能够获得弹箭类飞行器全表面的脉动压力分布,有利于捕获压力峰值和辨识跨声速非定常流场结构,更好地指导脉动压力载荷设计,在弹箭类飞行器设计中有较高的工程应用价值。

Study on Transonic Fluctuating Pressure by Wind Tunnel Testing using Fast Response Pressure Sensitive Paint (PSP)

We study the aircraft''s transonic fluctuating pressure characteristics by wind tunnel test using fast response pressure sensitive paint (PSP), and we have got the fluctuating pressure characteristics in the 1.2s experimental time of the whole aircraft in transonic flows (Mach Number 0.8~1.2), and the influence of Mach Number, angle of attack (rudder deflection angle) on the distribution characteristics of transonic fluctuating pressure is analyzed in a more comprehensive way. The wind tunnel test results show that, the PSP results are consistent with conventional fluctuating pressure sensor results and the measurement error of RMS fluctuating pressure coefficient is less than 15%, which meets the accuracy requirement of engineering design. Besides, compared with the traditional pressure sensor measurement, the fast response pressure sensitive paint measurement can get the fluctuating pressure characteristics of the whole surface of the aircraft, and it is helpful to accurately capture the peak value of fluctuating pressure, identify the structure of transonic unsteady shock wave movement, flow separation and reattachment. So, the fast PSP method is a new way to study the fluctuating pressure of the aircraft, and this test method is of good engineering application value in the design of aircraft.