激波在狭缝中绕射过程研究

Study of shock wave diffraction over a crack

针对固体火箭发动机药柱存在裂纹的情况,对运动激波在狭缝中绕射传播的非定常流场进行了计算,得到了清晰的流场变化图谱,从流场图中可分辨出激波在狭缝中的传播过程。对不同深宽比的狭缝进行研究,发现流场结构存在明显差别,在深宽比较小时狭缝内压力波振荡较小,当深宽比超过一定值时狭缝内的压力波产生剧烈振荡。研究结果表明,该方法可很好地描述激波在狭缝中的传播过程。

A detailed numerical investigation of an unsteady flow field of shock wave diffraction over a crack are performed aiming at the solid rocket motor grain with crack. A set of unsteady flow structures are obtained clearly, in which evolution process of shock can be observed. The flow structures are compared for different ratio of depth and width, the result predicted they vary with ratio of depth and width. When the ratio of depth and width expands a certain value, the pressure oscillates fiercely. The results show that the method can well be used to describe the process of shock wave over a crack.