脉管制冷机回热器流动阻力系数测量和模拟研究

Experiment and simulation study on the resistance coefficient of the regenerator of pulse tube cryocooler

针对脉管制冷机CFD模拟时,回热器的粘性阻力系数和惯性阻力系数的选取至关重要。为研究回热器的粘性阻力系数和惯性阻力系数,搭建了实验测量平台,实验研究了粘性阻力系数和惯性阻力系数与制冷温度、充气压力和丝网目数的变化关系,利用所测得的粘性阻力系数和惯性阻力系数作为输入参数进行仿真计算,建立了回热器二维数值仿真模型。结果表明:粘性阻力系数随充气压力和制冷温度的增加而减小,随丝网目数的增加而变大;惯性阻力系数随充气压力和丝网目数的增加而减小,随制冷温度的增加而变大。

Since CFD is widely used in simulating and modeling pulse tube cryocooler, the viscosity resistance coefficient and the inertancc resistance coefficient of regenerator are significant. In order to study the viscosity resistance coefficient and the inertance resistance coefficient, an experiment platform was set. The viscosity resistance coefficient and the inertance resistance coefficient were measured. Effects of cooling temperature, pressure and screen mesh on viscosity resistance coefficient and iner- tance resistance coefficient were studied. A two- dimension CFD model was built to verify the experiment result. Results show that the viscosity resistance coefficient decreases as the initial pressure and cooling temperature increase while increases as the sreen mesh increases, the inertance resistance coefficient decreases as the initial pressure and cooling temperature increase while increases as the cooling temperature increase.