A SIMPLIFIED TURBULENT-FLOW MODEL AND EXPERIMENTAL VERIFICATION FOR AN ACOUSTIC AMPLIFIER
A SIMPLIFIED TURBULENT-FLOW MODEL AND EXPERIMENTAL VERIFICATION FOR AN ACOUSTIC AMPLIFIER
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DOI：
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发表时间：
2008
影响因子：
2.4
通讯作者：
H. Jian;Luo Er
中科院分区：
文献类型：
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作者：
H. Jian;Luo Er
声放大器是热驱动热声制冷机中用于放大压力幅值的耦合器。由于其内压力幅值和流速较大，线性热声理论很难计算其放大倍数和最佳长度。本文基于线性热声理论，提出了声放大器的简化湍流模型，并搭建了热声发动机驱动的声放大器来验证该模型。实验结果表明与线性热声理论相比，该模型能够更精确地预测放大器的放大比和最佳长度。可以预见，该模型也适用于其他一些振荡流系统。
Acoustic amplifier is a kind of coupler to amplify the pressure amplitude in thermally driven thermoacoustic refrigerators.Because the pressure amplitude and the flow velocity in it are quite big,it is difficult for linear thermoacoustic theory to calculate its amplification ratio and optimum length.In this paper,based on linear thermoacoustic theory,a simplified turbulent-flow model for an acoustic amplifier was introduced.An acoustic amplifier driven by a thermoacoustic engine was set up to verify this model.Experimental results show that this model can much more precisely predict the amplification ratio and the optimum length of the amplifier compared with linear thermoacoustic theory.It can be foreseen that this model is also applicable in some other oscillating flow systems.