Flow Instability: Richtmyer-Meshkov and Pulsating Flows
Experimental study of the Richtmyer-Meshkov instability coupled with a chemical reaction
1:29 pm – 1:42 pmThe Richtmyer-Meshkov instability (RMI) at a chemically-reactive interface is studied experimentally in a vertical, downward-firing shock tube of large (25X25 cm) square internal cross section. The initial condition is prepared in two steps: first a flat, gravitationally stable, horizontal interface between helium (seeded with 6% acetone) and argon is formed. Then a shear layer is established by flowing an Ar/Kr/O2 mixture horizontally, immediately above the flat interface, and acetone-seeded He immediately below it. The proportions of Ar/Kr/O2 (52%/8%/40%) are selected so that the mixture density is the same as argon’s and the acetone/oxygen equivalence ratio is 0.5. The Atwood number between the acetone-seeded helium and argon is 0.69. The interface is impulsively accelerated by a M=2.0 shock wave and the acetone/oxygen mixture within the interface ignites upon reshock. Results from observation of complete chemiluminescence, OH chemiluminescence, and acetone planar laser-induced fluorescence are presented here.
Funding acknowledgement
Work supported by US DOE grant DE-NA0004098
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