Abstract
The Richtmyer–Meshkov instability behavior of a heavy-gas \((\text{ SF }_6)\) cylinder accelerated by a cylindrical converging shock wave is studied experimentally. A curved wall profile is well-designed based on the shock dynamics theory [Phys. Fluids, 22: 041701 (2010)] with an incident planar shock Mach number of 1.2 and a converging angle of \(15^\circ \) in a \(95\,\text{ mm }\times 95\) mm square cross-section shock tube. The \(\text{ SF }_6\) cylinder mixed with the glycol droplets flows vertically through the test section and is illuminated horizontally by a laser sheet. The images obtained only one per run by an ICCD (intensified charge coupled device) combined with a pulsed Nd:YAG laser are first presented and the complete evolution process of the \(\text{ SF }_6\) cylinder is then captured in a single test shot by a high-speed video camera combined with a high-power continuous laser. In this way, both the developments of the first counter-rotating vortex pair and the second counter-rotating vortex pair with an opposite rotating direction from the first one are observed. The experimental results indicate that the phenomena induced by the converging shock wave and the reflected shock formed from the center of convergence are distinct from those found in the planar shock case.
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Acknowledgments
The work was supported by the National Natural Science Foundation of China Project Nos. 10972214 and 11272308 and the Fundamental Research Funds for the Central Universities No. WK2090050014. The authors would like to thank Meiru Fan, Minghu Wang and Xiansheng Wang for valuable help during the experiments.
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Communicated by G. Jagadeesh and K. Kontis.
This paper was based on work that was presented at the 28th International Symposium on Shock Waves, Manchester, UK, July 17–22, 2011.
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Si, T., Zhai, Z., Luo, X. et al. Experimental study on a heavy-gas cylinder accelerated by cylindrical converging shock waves. Shock Waves 24, 3–9 (2014). https://doi.org/10.1007/s00193-013-0450-y
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DOI: https://doi.org/10.1007/s00193-013-0450-y