Shock induced Richtmyer-Meshkov instability in the presence of a wall boundary layer |
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Authors: | G Jourdan M Billiotte L Houas |
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Institution: | 1. Centre Saint Jér?me, IUSTI-CNRS Umr 139-Université de Provence, Case 321, F-13397, Marseille cedex 20, France
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Abstract: | An experimental investigation on gaseous mixing zones originated from the Richtmyer-Meshkov instability has been undertaken
in a square cross section shock tube. Mass concentration fields, of one of the two mixing constituents, have been determined
within the mixing zone when the shock wave passes from the heavy gas to the light one, from one gas to an other of close density,
and from the light gas to the heavy one. Results have been obtained before and after the coming back of the reflected shock
wave. The diagnostic method is based on the infrared absorption of one of the two constituents of the mixing zone. It is shown
that the mixing zone is strongly deformed by the wall boundary layer. The consequence is the presence of strong gradients
of concentration in the direction perpendicular to the shock wave propagation. Finally, it is pointed out that the mixing
goes more homogeneous when the Atwood number tends to zero. |
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Keywords: | Richtmyer-Meshkov instability CO 2 laser absorption Shock tube Concentration fields |
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