Transmission characteristics of acoustic amplifier in thermoacoustic engine
Transmission characteristics of acoustic amplifier in thermoacoustic engine
复制标题
热声发动机中声放大器的传输特性
DOI：
10.1016/j.enconman.2007.10.026
复制
发表时间：
2008-05
影响因子：
10.4
通讯作者：
Qiu, Limin
中科院分区：
文献类型：
--
作者：
Wang, Bo;Xiao, Yong;Sun, Daming;Qiu, Limin
热声发动机具有结构简单、运行可靠、工作气体环保等优点，在实际应用中具有广阔的应用前景。声放大器可以提高热声发动机的输出压力幅值，改善发动机与负载的匹配。为了充分利用声放大器，基于线性热声理论研究了声放大器的传输特性。计算和实验结果表明，声放大器的放大能力主要取决于其几何参数和输出电阻阻抗。适当长度和直径的声放大器的放大能力在输出电阻阻抗无穷大时达到最大。声放大器在放大压力幅值时也会消耗一定的声功率，声功率随放大比的增大而增大。在此基础上，提出了一种新型的级联声放大器，该放大器在降低声功耗的同时具有更强的放大能力。实验中，两级级声放大器将压力比从1.177放大到1.62，产生的压力幅值为0.547MPa，工作气体为2.20MPa的氮气。理论分析与实验结果吻合较好。本文的研究对全面认识声放大器的作用机理和充分利用声放大器具有指导意义。
Thermoacoustic engines are promising in practical applications for the merits of simple configuration, reliable operation and environmentally friendly working gas. An acoustic amplifier can increase the output pressure amplitude of a thermoacoustic engine (TE) and improve the matching between the engine and its load. In order to make full use of an acoustic amplifier, the transmission characteristics are studied based on linear thermoacoustic theory. Computational and experimental results show that the amplifying ability of an acoustic amplifier is mainly determined by its geometry parameters and output resistance impedance. The amplifying ability of an acoustic amplifier with appropriate length and diameter reaches its maximum when the output resistance impedance is infinite. It is also shown that the acoustic amplifier consumes an amount of acoustic power when amplifying pressure amplitude and the acoustic power consumption increases with amplifying ratio. Furthermore, a novel cascade acoustic amplifier is proposed, which has a much stronger amplifying ability with reduced acoustic power consumption. In experiments, a two-stage cascade acoustic amplifier amplifies the pressure ratio from 1.177 to 1.62 and produces a pressure amplitude of 0.547MPa with nitrogen of 2.20MPa as working gas. Good agreements are obtained between the theoretical analysis and experimental results. This research is instructive for comprehensively understanding the mechanism and making full use of the acoustic amplifier.
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DOI：
10.1109/ultsym.1991.234265
发表时间：
1991
期刊：
IEEE 1991 Ultrasonics Symposium,
影响因子：
--
作者：
W. Arnott;R. Raspet;H. Bass
通讯作者：
W. Arnott;R. Raspet;H. Bass
影响因子：
2.4
作者：
G. Swift
通讯作者：
G. Swift
影响因子：
2.1
作者：
K. Tang;Guo-bang Chen;T. Jin;R. Bao;Bo Kong;L. Qiu
通讯作者：
K. Tang;Guo-bang Chen;T. Jin;R. Bao;Bo Kong;L. Qiu
DOI：
10.2221/jcsj.32.672
发表时间：
1997-12
期刊：
Journal of Cryogenics and Superconductivity Society of Japan
影响因子：
--
作者：
Shuliang Zhou;Y. Matsubara
通讯作者：
Shuliang Zhou;Y. Matsubara
影响因子：
10.4
作者：
Darning Sun;L. Qiu;Wu Zhang;Weilin Yan;Guo-bang Chen
通讯作者：
Darning Sun;L. Qiu;Wu Zhang;Weilin Yan;Guo-bang Chen