激波与可运动颗粒群相互作用反射与透射机理实验研究

Reflection and transmission mechanism of shock wave interacting with moveable particle group

对水平圆柱形激波管内可压缩性气体与颗粒群的相互作用进行了实验研究与理论分析。利用由压力传感器、信号放大器、示波器和计算机组成的压力测量系统对激波与颗粒群作用时的动态压力进行了测量。发现激波管内发生的是一个复杂的过程,包括激波与颗粒群作用时伴随了激波和膨胀波的反射与透射现象、激波和膨胀波与接触面的干涉、以及激波从激波管端壁的反射等现象。当颗粒装载比α=1时,透射激波被直径为6mm的颗粒群衍射并且有膨胀波紧随其后,因此由透射激波引起的第一个压力峰急剧下降。颗粒装载比和颗粒直径影响透射激波的衍射和衰减。

Experimental study and theoretical analysis are conducted in this paper about the interaction of compressible gases with solid particle group in a horizontal cylindrical shock tube.Dynamic pressure measurements are performed by the pressure testing system which consists of pressure transducers,amplifiers,oscilloscope and a personal computer when shock waves interact with particle group.It is found that a complicated process happens in the shock tube,including the interaction of shock waves with particles accompanied with reflections and transmissions of shock and expansion waves,the interference of shock waves and expansion waves with contact surface,the shock reflections from the solid end-wall,and so on.Transmitted shock wave is diffracted by the particles with diameter of 6mm for particle loading ratio a = 1 and immediately followed by an expansion wave and hence the first pressure spike caused by transmitted shock wave decreases sharply.Particle loading ratio and diameter affect the diffraction and attenuation of transmitted shock wave.