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A comparative study on the evolution of compressible vortex ring generated from a short driver section shock tube
Fluid Dynamics Research ( IF 1.3 ) Pub Date : 2020-09-07 , DOI: 10.1088/1873-7005/abb09a
Santanu Dey 1, 2 , T Murugan 1, 2 , Dipankar Chatterjee 1, 2, 3
Affiliation  

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...

中文翻译:

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...
更新日期:2020-09-08
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