期刊
JOURNAL OF FLUID MECHANICS
卷 826, 期 -, 页码 819-829出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2017.506
关键词
compressible flows; instability; mixing
资金
- National Natural Science Foundation of China [11625211, 11621202]
- Science Challenge Project [TZ2016001]
Ritchmyer-Meshkov instability on an air/SF6 interface is experimentally studied in a coaxial converging shock tube by a high-speed laser sheet imaging technique. An unperturbed case is first examined to obtain the characteristics of the converging shock and the shocked interface. For sinusoidal interfaces, the wave pattern and the interface morphology of the whole process are clearly observed. It is quantitatively found that the perturbation amplitude first decreases due to the shock compression, then experiences a rapid growth to a maximum value and finally drops quickly before the reshock. The reduction of growth rate is ascribed to the Rayleigh-Taylor stabilization caused by the interface deceleration motion that is present in the converging circumstance. It is noted that the influence of the wavenumber on the amplitude growth is very little before the reshock, but becomes significant after the reshock.
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