<title>Moire deflectometric visualization and processing of the boundary-layer transition image on a cone in a hypersonic flow</title>

Abstract

In this paper, the application of a large aperture and high sensitivity moire interferometer in visualization of the boundary layer transition on a model in the hypersonic shock tunnel is presented experimentally and the measurement principles are described theoretically. By means of the computer image processing technique, the relative density profiles at the transition region in the boundary layer on a 200 cone model is calculated quantitatively. The freestream conditions in the hypersonic shock tunnel are M = 10. 29, Re/L = 1. 38 X 1071/m.