Study of a low temperature differential, high efficiency thermoacoustic engine

最近提出了一种可以降低临界起始温度的多级热声发动机。然而，采用多个回热器的多级热声发动机不仅需要在实部声阻抗分布的峰值处安装回热器，而且效率普遍较低。在本报告中，我们通过数值计算确定了多级热声发动机的结构，并考察了改变原动机温度时的效率。结果表明，多级热声发动机可以实现低温驱动和高效驱动。

A multistage thermoacoustic engine that can lower the critical onset temperature was suggested recently. However, a multistage thermoacoustic engine that uses multiple regenerators needs installation of regenerators not only at the peak of acoustic impedance distribution in real part, and therefore is generally inefficient. In this report, we determined the configuration of the multistage thermoacoustic engine by numerical calculation, and then examined its efficiency when the temperature of the prime mover was changed. The result shows that low temperature drive and high efficiency can both be achieved with a multistage thermoacoustic engine.