ABSTRAKT

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).