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基于线性热声理论,研究热声发动机回热器的几何参数和声场参数的耦合对其声功增益率的影响。较小的相对水力半径(几何参数)耦合负的近行波阻抗相角(接近0°相角)及较高的无量纲阻抗幅值(声场参数),可以有效提高回热器的声功增益率。在此基础上分别研究了驻波型、行波型和混合型热声发动机回热器的几何参数和声场参数的耦合特性,计算分析表明,为了获得最大的声功增益率,上述3种机型的回热器相对水力半径分别为1.1、0.5和0.3。同时指出,斯特林型热声发动机的高效性主要得益于回热器常温段具有较高的耦合特性,而高温段耦合条件恶化,耦合性能相对较低,制约了回热器性能的进一步提高。
Based on the linear thermoacoustic theory, the influence of the coupling of geometrical parameters and acoustic parameters on the acoustic power gain rate of thermoacoustic engine regenerator is studied. The smaller relative hydraulic radius (geometric parameter) coupling the negative near-phase impedance phase angle (near 0 ° phase angle) and the higher non-dimensional impedance amplitude (sound field parameter) can effectively improve the acoustic power gain rate. On this basis, the coupling characteristics of geometric parameters and acoustic parameters of standing-wave, traveling-wave and mixed-type thermoacoustic engine regenerators are studied respectively. The calculation and analysis show that in order to obtain the maximum acoustic power gain rate, Type regenerator relative hydraulic radius of 1.1, 0.5 and 0.3 respectively. At the same time, it is pointed out that the efficiency of the Stirling thermoacoustic engine is mainly attributed to the higher coupling characteristic of the regenerator in the normal temperature zone, the deterioration of the coupling condition in the high temperature zone and the relatively low coupling performance, which restricts the performance of the regenerator improve.