Investigation of the Distortion of Shock-Fronts in Real Gases,
AUSTRALIAN NATIONAL UNIV CANBERRA DEPT OF PHYSICS
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Previous experimental work has found that under certain conditions non-planar shock fronts and non-uniform test slugs occur in shock tubes, and suggests that in some instances a Rayleigh-Taylor instability at the contact surface is related to the real gas effects of the test gas. For this reason an extension is made of an analysis due to Levine that considers contact surface leakage when embedded in the relaxation region. Also, to elucidate the effect of the post shock boundary layer on possible contact surface instability, a modification of Mirels boundary layer entrainment theory, to take into account Levine-type mixing across the contact surface, is discussed. Experiments to determine shock shape, test sample uniformity and test slug length are carried out with the use of time resolved differential interferometry and streak shadowgraphy for ArSF6 test gas mixtures.