Comparison of mixing zone thicknesses from two measurement campaigns on Richtmyer-Meshkov induced mixing
Abstract
We have measured twice in a nearly similar shock tube the mixing induced by the Richtmyer-Meshkov instability of an air (below) - SF6 (above) interface accelerated by a Mach 1.2 shock in air and decelerated by a Mach 1.3 reflected shock in SF6 followed by a weaker rarefaction wave. The interface is a thin microfilm maintained between two grids, the lower one of mesh size supports the microfilm, the upper one of mesh size 1.8 or 12.1 mm slices the microfilm at shock passage. In both campaigns, the diagnostic was based on Schlieren visualization of the mixing zone. In the first campaign carried out at CEA, two initial SF6 lengths (30 and 25 cm) were chosen for the visualization using a still camera. In the second campaign carried out at ISAE on the modified shock tube. Schlieren visualization are performed with the aid of high speed camera. The visualizations have been obtained for initial SF6 lengths 10, 15, 20, 25 and 30 cm. We also varied the mesh size of the grid used to slice the membrane separating air below from SF6 above. In each campaign, several filtering techniques have been used for the analysis of the Schlieren images. For identical parameters of the experiments, we will examine similarities and differences in the measurements.
- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- November 2013
- Bibcode:
- 2013APS..DFDA30005H