斯特林热声发动机的直流研究  

Investigation on streaming in a Stirling thermoacoustic engine

作　　者：谭永翔[1] 邱利民[1] 孙大明[1] 郑金鹏[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》2006年第3期16-20,32,共6页Cryogenics

基　　金：浙江省自然科学基金;教育部优秀青年教师资助计划(M503192)资助

摘　　要：具有环路的斯特林热声发动机引入了反馈回路,实现了行波相位的热声转换,获得了较高的热声转换效率。然而,环路的拓扑结构使得声场中直流的产生成为可能,直流的出现将严重制约热声发动机的性能。本文以温度和压力测量作为重要实验手段,研究直流与热声发动机温度分布、压比、热声转化效率之间的关系,考察了直流抑制前后系统的性能,指出有效抑制直流能大幅度提高热声发动机的性能。By introducing feedback path, Stirling thermoacoustic engines with toroidal configuration realize the relatively high efficiency in thermoacoustic conversion. However, the toroidal topology allows the streaming to induce in the acoustic field which can seriously degrade the performance of Stirling thermoacoustic engines. Applying the measurements of pressure oscillation and temperature distribution as effective approaches, the relations among steaming, temperature distributions, pressure ratio and thermoacoustic conversion efficiency of the engine were investigated. It is shown that the performance of the engine can be remarkably improved by the efficient streaming suppression. This work is of importance for further understanding streaming in Stirling thermoacoustic engines.

关 键 词：热声发动机 直流 回热器 热缓冲管 

分 类 号：TB611[一般工业技术—制冷工程] TK511[动力工程及工程热物理—热能工程]