热端管长度对制冷效应影响的数值模拟研究

Numerical Simulation of the Effect of Hot end Tube Length on Refrigeration Effect

为了验证涡流管设计存在一个最佳热端管长,建立物理模型,采用理想气体空气为计算工质,采用RNG的k-ε湍流模型,进口温度为300 K,进口压力为0.3 MPa时,热端管长在60~200 mm范围内变化时,涡流管热端管管长对涡流管能量分离效应影响进行数值模拟,分析了管内冷芯处及近管壁处的温度场分布、速度场分布及压力场分布管长的改变对其的影响。结果表明随着热端管长的增加,制冷温度效应呈现先增大后减小的趋势,当管长为120 mm时,制冷效果最佳。

In order to verify that there is an optimal hot end tube length in the design of eddy current tubes,a physical model was established,the ideal gas and air were used as the calculation working fluid,the k-εturbulence model of RNG was adopted,when the inlet temperature was 300 K,the inlet pressure was 0.3 MPa,and the length of the hot end tube changed in the range of 60~200 mm,the influence of the hot end tube length of the eddy current tube on the energy separation effect of the vortex tube was numerically simulated,and the influence of the change of the temperature field distribution,velocity field distribution and pressure field distribution of the tube length at the cold core and near the pipe wall was analyzed.The results show that with the increase of the length of the hot end tube,the refrigeration temperature effect increases first and then decreases,and the refrigeration effect is the best when the length of the hot end tube is 120 mm.