Mesure de vitesses acoustiques par anémométrie laser dans un tube de Rijke

Abstract
We present some results of experimental investigations on thermoacoustic phenomenon, and more particularly on the Rijke's phenomenon. The goal is to give an experimental description of the instantaneous heat release between a hot grid and an acoustic wave leading to self excitation into a two open ended duct. As the unsteady thermal flux is directly related to the instantaneous velocity, measurements of the acoustic and mean velocities are made using the Laser Doppler Velocimetry method. This allows an evaluation of the unsteady heat released, and so of the amplitude of the thermoacoustic waves from theoretical models, which can then be compared to experimental results.