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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

FLOW OVER CAVITIES IN TRANSONIC REGIME: A TEST CASE FOR NUMERICAL SIMULATIONS

Nicolas Forestier
Department of Fundamental and Experimental Aerodynamics ONERA, 8, rue des Vertugadins, 92190 Meudon- France

Philippe Geffroy
Department of Fundamental and Experimental Aerodynamics ONERA, 8, rue des Vertugadins, 92190 Meudon- France

Laurent Jacquin
Department of Fundamental and Experimental Aerodynamics ONERA, 8, rue des Vertugadins, 92190 Meudon- France

Abstract

Two techniques were developed for characterizing the unsteady shear layer which develops on the open side of a deep cavity. The first is a 20 kHz spark light system (Nanolite/Strobokin) coupled with a rotating photographic apparatus (Strobodrum). The second is an acquisition method using a two-component Laser Doppler Velocimeter synchronized with the unsteady pressure measured in the cavity (Kulite sensor). This technique was used to determine phase averages by Lyn and Rodi's method (1994).