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Growth of shocked gaseous interfaces in a conical geometry

Kumar, Sanjay and Hornung, H. G. and Sturtevant, B. (2003) Growth of shocked gaseous interfaces in a conical geometry. Physics of Fluids, 15 (10). pp. 3194-3208. ISSN 1070-6631. http://resolver.caltech.edu/CaltechAUTHORS:KUMpof03

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Abstract

The results of experiments on Richtmyer-Meshkov instability growth of multimode initial perturbations on an air-sulfur hexafluoride (SF6) interface in a conical geometry are presented. The experiments are done in a relatively larger shock tube. A nominally planar interface is formed by sandwiching a polymeric membrane between wire-mesh frames. A single incident shock wave ruptures the membrane resulting in multimode perturbations. The instability develops from the action of baroclinically deposited vorticity at the interface. The visual thickness delta of the interface is measured from schlieren photographs obtained in each run. Data are presented for delta at times when the interface has become turbulent. The data are compared with the experiments of Vetter [Shock Waves 4, 247 (1995)] which were done in a straight test section geometry, to illustrate the effects of area convergence. It is found from schlieren images that the interface thickness grows about 40% to 50% more rapidly than in Vetter's experiments. Laser induced scattering is used to capture the air-helium interface at late times. Image processing of pictures is also used to determine the interface thickness in cases where it was not clear from the pictures and to obtain the dominant eddy-blob sizes in the mixing zone. Some computational studies are also presented to show the global geometry changes of the interface when it implodes into a conical geometry in both light-heavy and heavy-light cases.


Item Type:Article
Additional Information:©2003 American Institute of Physics. Received 30 January 2003; accepted 18 July 2003; published online 5 September 2003. The authors would like to thank Professor Joe Shepherd and Professor Mory Gharib of GALCIT for useful discussions during the course of this study. This work was supported by Caltech.
Subject Keywords:air; sulphur compounds; interface phenomena; flow instability; membranes; vortices
Record Number:CaltechAUTHORS:KUMpof03
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KUMpof03
Alternative URL:http://dx.doi.org/10.1063/1.1608011
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3602
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Jun 2006
Last Modified:26 Dec 2012 08:55

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