回热器参数耦合对热声发动机声功增益率的影响  

Influence of the Parameter Coupling of a Recuperator on the Acoustic Power Gain Rate of a Thermo-acoustic Engine

作　　者：张宁[1] 胡忠军[2] 李青[2] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074 [2]中国科学院理化技术研究所,北京100190

出　　处：《热能动力工程》2011年第6期639-644,768,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50906094)

摘　　要：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 thermo-acoustic theory,studied was the influence of the coupling of the geometric parameters of a thermo-acoustic engine recuperator with its sound field parameters on the acoustic power gain rate of the recuperator.A negative near-travelling-wave resistance phase angle(nearing to the zero phase angle) and a relatively high non-dimensional resistance value(a parameter of the sound field) coupled with a comparatively small relative hydraulic radius(geometrical parameter) can effectively enhance the acoustic power gain rate of a recuperator.On this basis,the coupling characteristics of the geometric parameters and the sound field parameters of a recuperator in a standing,travelling and hybrid wave type thermo-acoustic engine were studied respectively.The calculation and analytic results show that to obtain the maximum acoustic power gain rate,the relative hydraulic radia of the above-mentioned three types of engine were chosen as 1.1,0.5 and 0.3 respectively.In the meantime,the authors have also pointed out that the high efficiency of a Stirline type thermoacoustic engine mainly benefits from a relatively high coupling performance of the section of the recuperator at a normal temperature while that of the section at a high temperature is relatively low due to the poor coupling conditions of the section,thus restricting the further enhancement of the performance of the recuperator.

关 键 词：热声发动机 回热器 耦合 声功增益率 

分 类 号：TK511.3[动力工程及工程热物理—热能工程]