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为了减小黏性耗散,实际的行波型热声热机选择非零的回热器水力半径,这将产生热驰豫,引起温压相位差的偏移。为了提高热声转换效应,需要选择非零的压流相位差来平衡热驰豫引起的相位偏移。本文从热声学基本公式出发,结合数值模拟,分析热声发动机回热器水力半径对压流相位差优化选择的影响,利用已有文献的实验结果验证了理论分析的正确性,并使用本文的分析方法进一步完善了其实验结果的分析与总结。
In order to reduce the viscous dissipation, the actual traveling-wave thermoacoustic engine selects a non-zero regenerator hydraulic radius, which will generate thermal relaxation and cause a shift in temperature and pressure phase difference. In order to improve the thermoacoustic conversion effect, it is necessary to select a non-zero pressure flow phase difference to balance the phase shift caused by thermal relaxation. In this paper, based on the basic thermoacoustic formula, combined with numerical simulation, this paper analyzes the influence of hydrothermal radius of regenerator on the optimal selection of pressure phase difference. The experimental results of the existing literatures verify the correctness of the theoretical analysis. Analytical methods to further improve the analysis and summary of the experimental results.