熱音響現象の基礎と応用(<特集>未利用廃熱の高度利用技術の最新動向)

概要

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When an acoustic wave propagates in a tube, the pressure and displacement of the gas in the tube oscillate. Due to the pressure oscillation, the gas can undergo the compression and expansion process. On the other hand, the displacement oscillation can make the gas to undergo the heating and cooling processes, when the temperature gradient is subjected along the tube. Therefore, the propagation of an acoustic wave can cause the energy conversion from heat to work because the gas can experience compression, heating, expansion, and cooling process in order. The thermodynamic device using the acoustically caused energy conversion is called as a thermoacoustic engine. This engine is very attractive because it has very few moving parts, it can use west heat and solar energy, and it can realize a high efficiency. In this paper, a thermoacoustic engine is introduced and its recent topics are described.
2009-11-20