Thermoacoustic apparatus

Abstract

A thermoacoustic apparatus capable of reducing the time elapsed until an acoustic wave is generated and improving the energy conversion efficiency significantly is provided. In order to solve the above-described issues, in a thermoacoustic apparatusincluding a pair of heat exchangersandseparately set on the high temperature side and on the low temperature side, a second stackwhich is sandwiched between the heat exchangersandand which has a plurality of transmission paths in the inside, and a loop tubeprovided with the heat exchangersandand the stack, the thermoacoustic apparatus converting acoustic energy generated in the loop tubewith an acoustic wave generatorto thermal energy by using the heat exchangersandand the stack, a narrow portionin which the inner diameter is relatively reduced is disposed at a position at which the particle velocity of a standing wave generated in the loop tubeis in the vicinity of a maximum. Furthermore, in order to reduce the particle velocity, a branch tubeis connected at a position at which the particle velocity of a standing wave generated in the loop tubeis in the vicinity of a minimum.