驱动脉管用热压缩机性能数值模拟及实验研究

Numerical Analysis and Experimental Study of Thermocompressor for Pulse Tube Cooler

对热压缩机中关键的换热过程建立了简化模型并进行了数值计算,计算得出声功及热效率随着小孔系数的变化存在最佳值,增大平衡压力和加热温度可以增大系统声功。建立了可测量声功的热压缩机实验系统,在不同的小孔系数下测量了声功,并对比分析了实验与数值结果,二者随小孔系数变化的趋势相同,但值相差较大。通过进一步的对比分析发现,这主要是实验中余隙容积过大和回热器换热不充分造成的,余隙容积和回热器传热效果对热压缩机性能的影响很大。

A numerical model is established for the performance of thermocompressor with gap regenerator and orifice-reservoir. There exists the maximum output acoustic power with an optimal orifice opening. High pressure and heating temperature raise the acoustic power of the system. Acoustic power is measured during experiment to validate the numerical results. The trends of numerical results accord with the experimental one. Analysis shows that large clearance volume ratio and heat transfer insufficiency of regenerator should be responsible for the difference.