环路声学共振多级行波热声发动机的机理研究

针对环路声学共振多级行波热声发动机的工作机理进行了研究,重点分析了环路声学共振4级行波热声发动机无负载工作情况,并比较了环路声学共振4级、8级、16级行波热声发动机的工作性能。计算结果表明,这一行波热声发动机具有较好的声场分布并通过增大回热器横截面积有效降低了回热器内的粘性流动损失。增加环路声学共振多级行波热声发动机的级数仍能获得较为理想的工作性能,并能够增加整机产生净声功率,降低谐振管消耗声功率的比例,相对传统带驻波谐振管的行波热声发动机更为紧凑。

Investigation on acoustically-resonant looped multi-stage traveling wave thermoacoustic engine

The mechanism of a looped multi-stage traveling wave thermoacoustic engine was studied,mainly by analyzing the non-load performance of the looped 4-stage traveling wave thermoacoustic engine,and by comparing it with 8-stage and 16-stage engines.Based on the simulation,the phase relationships between oscillating pressure and velocity waves are satisfactory for the multi-stage thermoacoustic heat engines.The viscous losses reduction in the regenerator can be solved by enlarging the regenerator cross-section area.In addition,increasing the number of stages still gives a satisfactory performance,showing an enhanced net acoustic power the regenerators and a less acoustic loss ratio in the resonators.Thus,the novel looped multi-stage configuration is comparatively compact over the conventional traveling-wave heat engine with a single long standing-wave resonator.