The compressible vortex ring emanating from an ultra-short driver section shock tube is simulated using Euler and Navier–Stokes solvers for a diaphragm pressure ratio of 8.4. The numerical results are compared with smoke flow visualization experiments performed in a shock tube. Here the main focus is to compare the vortex ring evolution during its self-sustained motion as many researchers studied the vortex ring dynamics during its formation and growth stage. It is observed that the formation and interaction of Kelvin–Helmholtz (K-H) vortices generated at the trailing jet make the flow distinct in the solvers and experiments though the shock cell structures, embedded shock, and counter-rotating vortices are similar. Surprisingly in simulations, the vortex ring has regained its compact structure after its strong interactions with K-H and counter-rotating vortices. Whereas, it becomes a turbulent structure during its self-sustained motion in experiments. Further, the vortex ring s...

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短驱动段激波产生可压缩涡环的比较研究

使用Euler和Navier-Stokes求解器模拟了超短驱动器部分激波管发出的可压缩涡流环，其膜片压力比为8.4。将数值结果与在激波管中进行的烟流可视化实验进行比较。由于许多研究人员研究了涡旋环在其形成和生长阶段的动力学，因此这里的主要焦点是比较涡旋环在其自持运动过程中的演化。可以观察到，尽管冲击单元的结构，嵌入的冲击和反向旋转的涡流是相似的，但在后喷流处产生的开尔文-亥姆霍兹（KH）涡流的形成和相互作用使得在求解器和实验中流量明显不同。令人惊讶的是，涡旋环与KH和反向旋转的涡旋强烈相互作用后，恢复了其紧凑的结构。而在实验中，它在自持运动过程中变成了湍流结构。此外，涡流环会...