微型回热器等效直径与振荡频率的理论研究  

Theoretical research on equivalent diameter and oscillation frequency of miniature regenerator

作　　者：刘益才[1] 李青[2] 杨智辉[1] 刘振利[1] 曹立宏[1] 黄谦[1] 

机构地区：[1]中南大学制冷与低温研究所,长沙410083 [2]中国科学院理化技术研究所低温事业部,北京100080

出　　处：《低温工程》2006年第3期55-59,共5页Cryogenics

基　　金：国家自然科学基金(F040209;50576024);中南大学博士后科学基金(20040708)资助

摘　　要：通过对微通道中影响振荡流体的粘性损失的两个准则数的论述,得出实际的微型热声制冷机微通道回热器的等效直径、驱动膜片的振幅以及对应的辐射声功等参数的对应关系,即是:回热器通道直径或通道等效水力直径必须满足高频下的沃姆斯莱数小于5的限制;同时还必须满足在高频下的马赫数小于0.1;频率的上限也必须满足马赫数、沃姆斯莱数、回热器微孔直径以及膜振动平均位移计算前提(ka<0.5)。The size and efficiency of the regenerator directly correlate with the thennoacoustic conversion efficiency. For the regenerator on the permission of a certain heat penetration depth, the corresponding viscidity penetration depth must be reduced. Two pieces of criterion counting which influence the viscidity loses of the shaking fluid were described and some corresponding parameters of the real miniature thermoacoustic engine tiny pass-way regenerator, such as equivalent diameter, urge amplitude of the diaphragm and corresponding radiation sound work, etc, were obtained. It is shown that the pass-way diameter or pass- way equivalent water conservancy diameter must meet the limit that the Womersley must be less than 5 in the high frequency fields and the Mach number must also be less than O. 1 under high frequency. The upper limit of frequency must meet the limits of Mach number , Womersley , the diameter of the regenerator tiny hole and the average displacement of membrane vibration （kα 〈 0. 5 ）.

关 键 词：微型回热器 沃姆斯莱数(Womersley) 马赫数 微孔直径 振荡频率 

分 类 号：TB651[一般工业技术—制冷工程] O422.2[理学—声学]