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浙江大学学报(工学版)
J4  2009, Vol. 43 Issue (8): 1463-1468    DOI: 10.3785/j.issn.1008-973X.2009.
    
Transmission characteristics of  coupled pipe system in thermoacoustic engine
 BAI Hun, QIU Li-Min, WANG Bei, SUN Da-ming, CHAO Wei
Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
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Abstract  

For optimizing the match between thermoacoustic engine and pulse tube refrigerator, the transmission equation of a coupled three-pipe system was derived based on the fluid network model and the linear thermoacoustic theory. The amplification characteristics of pressure ratio and the acoustic power needed at the inlet of the coupled pipe system with different pipe diameter and length were calculated and compared based on DeltaE. With suitable pipe diameter, experiments were done on a travelling-wave thermoacoustic engine to verify the amplification characteristics of pressure ratio of the coupled pipe system. RC load method was used to measure the acoustic power at the end of the coupled system, and the characteristics of the output acoustic power changing with the impedance at the end of the coupled system were studied. Tendency agreement between the calculation prediction and experimental results was obtained. Using nitrogen as working fluid at 2-20 MPa, the pressure ratio of 1-50 was obtained at the end of the coupled  system, and the maximum output acoustic power obtained under certain resistance was 105 W.

Published: 28 September 2009
CLC:  TK 1  
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Cite this article:

BAI Hun, QIU Li-Min, WANG Bei, et al. Transmission characteristics of  coupled pipe system in thermoacoustic engine. J4, 2009, 43(8): 1463-1468.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2009.     OR     http://www.zjujournals.com/eng/Y2009/V43/I8/1463


耦合管道系统在热声发动机中的传输特性

为了优化热声发动机和脉管制冷机之间的匹配,在流体网络模型的基础上,结合线性热声理论,推导了三管道耦合系统的传输方程,利用DeltaE对耦合系统在不同直径和长度下的压比放大特性和入口所需声功进行了理论计算和对比.各管道采用合适的直径,在行波热声发动机上对管道耦合系统的压比放大特性进行了实验验证.采用RC负载法测量耦合系统末端的声功,研究了在末端不同阻抗下耦合系统的声功输出特性.理论预测和实验结果趋势一致.实验中采用高纯N2作为工质,当工作压力为2.20MPa时,在耦合系统末端获得了1.50的压比;在一定的输出阻抗下获得了105W的输出声功.

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