牛津型斯特林制冷机回热器特性的理论研究

Theoretical Analysis on Regenerator Characteristics of a Stirling Cryocooler

考虑到工质气体的可压缩性和非理想效应 ,在进入气流简谐波动的条件下对回热器建立了理论模型 ,对牛津型斯特林制冷机的回热器动态热力特性进行了理论求解。通过对动态压力、速度、温度等参数的求解结果分析可知 ,气体与填料之间的热交换对气流压力波动和速度波动影响很小 ,而对气流温度波动影响很大。并且给出了回热器优化的措施。

A theoretical analysis on the regenerator characteristics of a typical Stirling cryocooler has been carried out. Assuming simple sinusoidal oscillations, the static and oscillatory pressures, velocities and temperatures have been determined for a model that includes a compressible gas and imperfect thermal contact between the gas and the regenerator matrix. For realistic material parameters, the analysis reveals that the pressure and velocity oscillations are largely independent of details of the thermal contact between the gas and the solid matrix. Only the temperature oscillations depend on this contact. Suggestions for optimizing the design of a regenerator are given.