LDV measurement of the velocity amplitude of the traveling-wave thermoacoustic engine with liquid piston and phase change

Abstract

In this study, the acoustic power gain of a traveling-wave thermoacoustic engine with liquid piston and phase change was measured. The traveling wave thermoacoustic engine amplifies acoustic power when a traveling wave passes through the regenerator. When the working gas is assumed as an ideal gas, the maximum gain of the acoustic power is determined by the absolute temperature ratio at the both ends of the regenerator. However, by using the liquid vapor phase change, the maximum gain is not necessarily to be the absolute temperature ratio. In this experiment, a liquid piston and the liquid vapor phase change was used in the energy conversion. Furthermore, the acoustic power was amplified from 3.48×10^-4W to 7.32×10^-4W and the gain was 2.11, when the absolute temperature ratio was 1.17.