Unsteady Measurement of a Supersonic Cavity Flow by Laser-Induced Fluorescence Method

Abstract

A method for measuring temperature fluctuations in a high-speed flow is developed by the use of a laser-induced fluorescence (LIF) technique. Propagation speed of disturbance can be found by a time lag of cross-correlation functions between the time-dependent LIF signal and a pressure sensor signal at a reference point. The method is applied to a supersonic cavity flow to elucidate the feedback mechanism of self-sustaining flow oscillation.