Flow in Thermoacoustic Sound Weve Generator and Its Application :Power Generation with Thermoacoustic Phenomena

Abstract

The flow in a thermoacoustic sound wave generator and its application, i. e., power generation with thermoacoustic phenomena, are described. Flow measurement with a hot-wire single probe and simultaneous measurement of velocity, pressure and temperature are performed for analyzing the sound wave generation and propagation mechanism in the resonance tube. Tandem hot-wrie anemometer measurement is employed for ensuring sufficient axial velocity and its direction. Oscillating flow is observed in the resonance tube in which the forward axial velocity amplitude is equal to the backward one. Both forward and backward flow are observed in the central region near the tube outlet where the maximum axial velocity of 43m/s is observed. Intermittent flow is observed far downstream of the resonance tube outlet. Power generation utilizing the flow in the thermoacoustic sound wave generator is successful, where the maximum number of propeller revolutions of 6500 rpm and maximum electric power of 160 mW are obtained.