热声系统起振机理的初步研究  

A PRELIMINARY INVESTIGATION ON THE ONSET MECHANISM IN THE THERMOACOUSTIC OSCILLATIONS

作　　者：欧阳录春[1] 邱利民[1] 张武[1] 孙大明[1] 谢雪梅[1] 

机构地区：[1]浙江大学制冷与低温研究所,杭州310027

出　　处：《低温工程》2002年第5期6-11,共6页Cryogenics

基　　金：国家自然科学基金 (5 0 0 0 6 0 11);教育部全国优秀博士学位论文作者专项基金 (2 0 0 0 33)资助

摘　　要：根据气体密度、粘度和导热系数等物性参数随温度的变化规律 ,在对热声系统中热声转换的关键部件丝网板叠进行合理简化的基础上 ,给出了热声系统起振机理的一种初步解释 ,对进一步完善热声理论具有一定指导意义。Thermoacoustic engines and refrigerators were already becoming attractive alternatives in specialized applications.Based on the variations of the thermophysical properties of the working gas and reasonable assumptions of the dense mesh wire screen stack,the key part of the thermoacoustic oscillation,a preliminary explanation is proposed to illustrate the onset mechanism in the thermoacoustic sytem.Because the gas density decreases with temperature when the viscosity and heat conductivity increase,the abnormal relationship between the pressure loss and mass flux would appear.In this way,thermoacoustic oscillations will occur.Some interesting results are also presented and instructive to improve the thermoacoustic theory.

关 键 词：热声系统 起振机理 驻波型热声发动机系统 热声理论 丝网板叠 换热 热声振荡 

分 类 号：TK12[动力工程及工程热物理—工程热物理] TB611[动力工程及工程热物理—热能工程]