Collective light scattering (CLS) and the diagnostics of velocity fluctuations in supersonic flows

Abstract

This paper deals with a brief overview of new experimental results that can be obtained with the collective light scattering (CLS) method in supersonic flows. Wake and mixing layer configurations are used in order to illustrate the possibilities of the method. The collective light scattering bench can be considered as a directional densitometer (with spectral analysis of the density fluctuations), a non-particle anemometer, a Mach-meter (or thermometer) and a directional microphone.