激波管内球形Shock Wave的内爆和爆炸动力学
On the Dynamics of Imploding and Exploding Spherical Shock Wave Inside a Shock Tube
摘要：
本文研究了激波聚焦现象及其粘性效应，激波聚焦是通过激波管和附加在激波管上的会聚段实现的，会聚段将平面激波转化为球形激波，并将其聚焦到一个有限区域内。本研究选择了初始强度Ms=2.94的冲击波。聚焦区域的详细数值研究表明，在反射激波和涡流形成之后形成了蘑菇状结构。这是可视化的，通过数字阴影图像，并通过跟踪流场中的流线。为了进行定量评估，对温度的变化进行了研究。发现蘑菇状结构内部的温度高于反射激波后面的温度。并对该区域的组分质量分数进行了研究。蘑菇状结构内的流动被认为是一个反应性的混合气栓。
英文摘要：
The present work aims to study the phenomenon of shock wave focusing and the effect of viscosity in it. The focusing is achieved with a shock tube and a converging section attached to it. The converging section transforms the planar shock into a spherical shock and focuses it into a confined area. A shock of an initial strength Ms=2.94 has been chosen for the present studies. A detailed numerical study of the focusing region shows the formation of a mushroom-shaped structure behind the reflected shock and vortex formation. This was visualised through numerical shadowgraph images and by tracing the streamlines in the flow field. A study on the variation in temperature is carried out in order to have a quantitative assessment. It was found that the temperature inside the mushroom structure is higher than that behind the reflected shock. The study of species mass fraction in this region is also made. The flow inside the mushroom structure was found to be a reactive mixture of gas slug.
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