Richtmyer-Meshkov instability on a low atwood number interface after reshock.

Weber, Chris (University of Wisconsin-Madison, Madison, WI)

Sandia National Laboratories

关键词: Amplitudes;    Wavelengths;    71 Classical And Quantum Mechanics, General Physics;    Standing Waves;    Mixtures;   

DOI  :  10.2172/993897
RP-ID  :  SAND2009-6235
RP-ID  :  AC04-94AL85000
RP-ID  :  993897

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Richtmyer-Meshkov instability after reshock is investigated in shock tube experiments at the Wisconsin Shock Tube Laboratory using planar laser imaging and a new high speed interface tracking technique. The interface is a 50-50% volume fraction mixture of helium and argon stratified over pure argon. This interface has an Atwood number of 0.29 and near single mode, two-dimensional, standing wave perturbation with an average amplitude of 0.35 cm and a wavelength of 19.4 cm. The incident shock wave of Mach number 1.92 accelerates the interface before it is reshocked by a reflected Mach 1.70 shock wave. The amplitude growth after reshock is reported for variations in this initial amplitude, and several amplitude growth rate models are compared to the experimental growth rate after reshock. A new growth model is introduced, based on a model of circulation deposition calculated from one-dimensional gas dynamics parameters. This model is shown to compare well with the amplitude growth rate after reshock and the circulation over a half-wavelength of the interface after the first shock wave and after reshock.