斯特林热声发动机的直流研究

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.

Investigation on streaming in a Stirling thermoacoustic engine

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.