热声发动机径向尺寸对谐振频率的影响  

Influence of radial dimension on operating frequency of thermoacoustic engine

作　　者：周刚[1] 李青[2] 李正宇[2] 李强[2] 

机构地区：[1]华中科技大学,武汉430074 [2]中国科学院理化技术研究所,北京100080

出　　处：《声学技术》2007年第4期761-766,共6页Technical Acoustics

基　　金：国家自然科学基金(50276064和90407012)

摘　　要：频率是热声系统中最为关键的参数,小型化面临的问题是系统运行频率升高,粘性阻力损失增加。对频率展开研究的结果是谐振管的径向尺寸对热声发动机的谐振频率影响很大,通过调节谐振管的径向尺寸,可以大大降低整机的谐振频率,对于指导热声斯特林发动机的小型化具有重要的指导意义。据此得到的计算结果与实验研究的结果验证了这种方法是十分有效的,可以达到降低系统谐振频率30%以上。Influence of the radial dimension of tubes, especially the resonance tube on the operating frequency of the thermoacoustic Stifling heat engine is described and analyzed using the lumped-element model, and simulated with linear thermoacoustic theory. The analyses and calculation show that changes in the inner diameter of the system tubes, especially the resonance tube, can lead to remarkable change of the operating frequency. Based on the calculation and analyses, we build up a miniature engine with a resonance tube that is only 0.35m in length. Experiments show that, when the resonance tube diameter increases from 15mm to 22mm, the operating frequency changes from 226 Hz to 304 Hz, an increase of 34.5%. This is consistent with the computed result, with errors less than 5%. The experiment also shows that change of the operating frequency leads to the change of performance such as pressure amplitude. This is meaningful for the design and miniaturization of the thermoacoustic Stirring heat engine.

关 键 词：谐振频率 热声斯特林发动机 阻抗 集总参数 

分 类 号：TB567[交通运输工程—水声工程]