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众所周知,当一平面激波同任意形状的障碍物相互作用时,将产生十分复杂的波系,其中激波在曲面壁上的绕射和反射,将产生非定常波系。关于平面激波在凹圆柱壁面上的传播,我们可以用一连串、长度为无限小的楔面所构成的多边形来近似和代替凹圆柱面,因此分析和研究激波在两段楔面上反射和绕射的目的在于得出激波在圆柱壁面以及其它较复杂形状壁面上的传播规律。本文采用马赫-曾德干涉仪在激波管上进行光测模型实验。根据所拍摄的流场干涉图像,以分析其波系的演变过程及传播规律,得到有关流场的密度分布和压力分布,更为重要的是给出流场参数的定量结果。
It is well-known that when a planar shock wave interacts with an obstacle of arbitrary shape, a very complicated wave system will be generated. The diffraction and reflection of the shock wave on the curved wall will produce unsteady wave series. With regard to the propagation of a planar shock wave on a concave cylindrical wall, we can approximate and replace the concave cylindrical surface with a series of polygons formed by infinitely long wedge surfaces. Therefore, we analyze and study the reflection of the shock wave on the two wedge surfaces The purpose of diffraction is to derive the propagation of shock waves on the cylindrical wall and other more complex shape of the wall. In this paper, Mach-Zehnder interferometer in shock tube photometric model experiments. According to the image of the flow field interfered with to analyze the evolution and propagation of its wave system, the density distribution and pressure distribution of the flow field are obtained. More importantly, the quantitative results of the flow field parameters are given.