相変化を利用した熱音響エンジンの音響パワー増幅

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書誌事項

タイトル別名
  • Acoustic power amplification by thermoacoustic engine with gas-liquid phase change
  • (Part 2. numerical simulation)
  • ― その２ 数値シミュレーション－
公開日
2019
DOI
  • 10.1299/jsmepes.2019.24.e124
公開者
一般社団法人 日本機械学会

説明

Regenerators generate fluid oscillation by heating the tube wall at the high temperature end above critical temperature of thermoacoustic engines. Y. Ashigaki et al. indicated that regenerators with condensing vapor generate higher acoustic power amplification gain than them without condensing vapor. Although our study (acoustic power amplification by thermoacoustic engine with gas-liquid phase change: Part 1. experimental study) also indicates higher acoustic power amplification gain especially in case of lower temperature at high temperature end, the regenerator has a local maximum of acoustic power amplification gain with the transition of the tube wall temperature at high temperature end, which is one of the typical phenomena of regenerators with condensing vapor. We have developed a numerical simulation of fluid flow by forced fluid oscillation and gas-liquid phase change in the regenerator. We have set two imaginary analysis lines outside of low and high temperature end and calculated mean velocities on them. We have defined amplitude amplification gain as the ratio of mean velocities and assumed that the amplitude amplification gain corresponds to the acoustic power amplification gain. Our simulation indicates that the regenerator has a local maximum value of the amplitude amplification gain with the transition of the tube wall temperature at high temperature end.

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