平面激波与气泡界面相互作用过程的数值研究

Numerical Study of Interaction Process of Planar Shock Wave and Bubble Interface

对在空气中的平面激波与He气泡和SF6气泡相互作用过程进行了数值计算。利用大涡模拟(LES)方法,使用具有三阶精度的Third-Order MUSCL算法对气泡的发展与变形过程进行了模拟,然后与文献中的实验结果进行了比较。结果发现:无论激波通过低密度界面还是高密度界面,都会有射流结构和涡的产生,但产生的机理并不相同;对于密度低的界面,气泡会演化为两个对称的"气泡"结构,并产生两个独立的涡和持续时间较短的射流;而对于密度高的界面,气泡会演化为"尖钉"结构。

The numerical simulation was carried out for interaction process among planer shock wave and He or SF6 bubbles in air.The large eddy simulation（LES）method and the Third-Order MUSCL algorithm with third-order accuracy were adopted to simulate bubble development and deformation process.Then,the results were compared with experimental results in literatures.The results show that no matter whether the shock wave passes through low-density interface or high-density interface,the jet and eddy structures will be generated,but the generating mechanisms are different.For the low-density interface,the buddle will evolve into two symmetrical smaller bubbles,and generate two separate vortices and jet flow which lasts in a short time.For the high-density interface,the bubble will evolve into the＂spike＂structure.