声学放大器对热声发动机性能的影响  

Influence of acoustic amplifier on performance of thermoacoustic engine

作　　者：孙大明[1] 邱利民[1] 谭永翔[1] 邓夏[1] 王波[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2期10-14,共5页Cryogenics

基　　金：国家自然科学基金重点项目(50536040);霍英东基金(94013)项目资助

摘　　要：对声学放大器的声功传输能力以及其对热声发动机性能的影响进行了实验研究,发现声学发大器只有在一定条件下才能提高热声发动机的输出压比,当末端阻抗减小时其放大能力也减小。声学放大器本身也是一个声学阻力部件,如果仅以负载引出功计算热声发动机的效率,声学放大器在输出端负载阻抗较大时能够提高系统热效率,当负载阻抗减小后,它将使发动机的热效率急剧降低。The acoustic power transportation ability of an acoustic amplifier and its influence on a thermoacoustic engine was investigated experimentally. Its is shown that the acoustic amplifier can increase the output pressure ratio under certain conditions. Its amplifying ability decreases with the end acoustic impedance. Further more, the acoustic amplifier is also an acoustic resistance component. If thermal efficiency is calculated only with output power, the acoustic amplifier increases the thermal efficiency of the thermoacoustic engine when the end acoustic impedance is large, while the thermal efficiency of the thermoacoustic engine degrades rapidly with small end impedance.

关 键 词：声学放大器 热声发动机 热效率 负载 

分 类 号：TB651[一般工业技术—制冷工程] TB663