旋转式斯特林制冷机热仿真分析与优化

Thermal simulation and heat dissipation optimization of rotary Stirling cryocoolers

旋转式斯特林制冷机在工作时会放热,主要包括压缩放热、驱动元器件放热和电机定子放热,放热引起的温升会影响制冷机和红外系统的性能。本文利用Ansys有限元软件对旋转式斯特林制冷机进行瞬态热仿真分析,得到制冷机各零件的温度分布。模拟结果表明,在对流换热系数为3 W/(m^2·℃)条件下,制冷机表面电机外壳温度最高,最高温度为外壳中心(36.85℃),沿压缩端、冷指端两个方向,温度逐渐降低。实验与仿真结果基本一致,证明了模拟方法的有效性。忽略对流换热,对制冷机进行散热仿真优化后,有效抑制了制冷机温升,制冷机整体温度降低约4℃。

Rotary Stirling cryocoolers generate heat during operation,including compression heat,heat dissipation of motor and driver components.The temperature rise affects the performance of cryocoolers and systems.In this paper,Ansys software was used to carry out thermal simulation,and the temperatures of each part were obtained.The simulation results show that the highest surface temperature of cryocooler is at center of motor shell and the temperature reaches 36.85℃when convection heat transfer coefficient is 3 W/(m^2·℃),temperature decreases gradually along compression end and cold finger end.The experimental result is basically consistent with the simulation result,which proves the validity of the simulation method.After optimizing heat dissipation of cryocooler when ignore convection,the temperature rise is effectively suppressed,cryocooler overall temperature decreases by nearly 4℃.