双声源驱动热声制冷机特征时间的熵产分析

在有限时间热力学理论的基础上，对双声源驱动热声制冷机的回热器声场进行分析，以特征时间为特征参数来表征热声系统的换能效应，寻求特征时间与回热器熵产之间的最优关系以及其他因素对熵产率的影响. 结果表明:熵产率随着特征时间的减少，到达一个极小点后再平缓增大，通过调节阻抗比，寻求到一个最佳阻抗比值所对应的最小熵产率， 存在一个最优特征时间使得系统的不可逆熵产最小，此时不可逆能量损失最小，有效的提高了双声源驱动热声制冷机效率，有利于双声源驱动系统运行.

Entropy Production of Characteristic Time for Thermoacoustic Refrigerator by Double Acoustic Drivers

The regenerator sound field of thermoacoustic refrigerator driven by dual sound source was analyzed on the basis of the theory of finite time thermodynamics. The characteristic time was used as parameters to characterize the transducer effect of thermoacoustic system, to obtain the optimal relationship between the characteristic time and regenerator entropy production, and explore the influence of other factors on the entropy production rate. The result shows that with the decrease of the characteristic time, the entropy production rate reaches a very small point and then increases again. By adjusting the impedance ratio, the minimum entropy production rate corresponding to a best impedance ratio is sought. The existence of an optimal characteristic time makes the irreversible entropy production of the system minimum. At this point, the irreversible energy loss is minimal, which effectively improves the efficiency of the thermoacoustic refrigerator driven by dual sound source, and is conducive to the system driven by double sound source.