谐振管形状对热声声场能量的影响  

Influence of the shapes of resonance tubes on the fundamental frequency energy of thermoacoustic acoustic field

作　　者：刘益才[1] 黄谦[1] 曹立宏[1] 郭方中[2] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083 [2]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2007年第4期81-84,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50676110)

摘　　要：讨论了热声热机谐振管声场中基频能量的漂移现象,对不同形状谐振管中声场分布进行了理论研究,分析了声源在指数型号筒中输送声波的条件,指出其频率必须大于号筒截止频率.结果表明:a.指数型号筒具有抑制高低次谐波的作用;b.谐振管形状的配置原则为:在声源前面布置一段渐缩声管,然后依次是过渡声管、渐扩声管,这样就可以在谐振管中得到一定频带范围内(fc1<f<fc2)的声波频率,实现阻抗的匹配,符合整个声谐振管阻抗匹配要求;c.从实验上验证了把等截面谐振管变为变截面谐振管有助于对基频能量漂移的抑制.The fundamental frequency energy drift phenomenon of the resonance tube＇s acoustic field in the thermoacoustic engine was discussed. The relation between the shapes of the resonance tube and acoustic filed was investigated. Sound wave could be transferred while the frequency of sound sources in the exponential type horn was higher than the horn＇s critical frequency. Three conclusions is as follows ： a. The exponential type horn can suppress high harmonic wave and low harmonic wave. b. The principle of the shape collocation can be arranged： a section of convergent sound tube before sound source and a section of passage sound tube, then a section of jet pipe is arranged at the terminal end. In this way, the frequency of sound wave can be got in certain range （fc1〈f〈fc2）. It confirms to requirement of whole resonance tube＇s impedance matching, c. It is verified experimentally that convergent resonance tube is better than uniform section type on suppressing fundamental frequency energy drift.

关 键 词：谐振管 热声热机 基频 能量漂移 变截面 

分 类 号：TB651[一般工业技术—制冷工程] O422.2[理学—声学]