涡流室结构参数对小管径涡流管制冷性能影响的三维数值模拟

发布时间：2018-08-19 11:57

【摘要】：为提高小管径涡流管的制冷效率,以产生高速涡流和发生工质分离的涡流室为对象,分析了涡流室内工质分区域流动和组合涡流动的特点,并利用standard k-ε湍流模型实现了涡流室内工质的流动过程仿真.通过分析涡流室内工质速度场、温度场和压力场的变化情况,阐明了涡流室内工质分区域流动和组合涡流动的原因,以及这一流动形式与涡流管制冷性能的关系.在此基础上,讨论了涡流室结构参数对制冷性能的影响.其结果表明,为获得较低制冷温度和较高制冷效率,涡流室直径应取1.5~2倍的热端管管径,涡流室高度为1/6.67~1/5.71倍的热端管管径,同时流道喉部截面宽度应使涡流室最小进气面积为热端管横截面面积0.233倍.
[Abstract]:In order to improve the refrigeration efficiency of vortex tube with small diameter, the characteristics of working fluid flow and combined eddy current movement in the vortex chamber are analyzed, taking the eddy current chamber with high speed eddy current and separation of working fluid as the object. Standard k- 蔚 turbulence model is used to simulate the fluid flow in eddy current chamber. By analyzing the variation of velocity field, temperature field and pressure field of working fluid in eddy current chamber, the reasons for the flow of working fluid in the eddy current chamber and the combined eddy current movement are explained, and the relationship between this flow form and the refrigeration performance of vortex tube is also discussed. On this basis, the influence of vortex chamber structure parameters on refrigeration performance is discussed. The results show that in order to obtain lower refrigeration temperature and higher refrigeration efficiency, the diameter of eddy current chamber should be 1.5 ~ 2 times the diameter of hot end tube, and the height of eddy current chamber should be 1 / 6. 67 / 1 / 5. 71 times of hot end tube diameter. At the same time, the throat section width of the passage should make the minimum air intake area of the swirl chamber 0.233 times the cross section area of the hot end tube.
【作者单位】：西安理工大学机械与精密仪器工程学院;
【基金】：国家自然基金项目(51475366) 高等学校博士学科点专项科研基金项目(20116118110005) 陕西省教育厅科学研究计划项目(12JK0688);陕西省教育厅重点实验室科学研究计划项目(12JS072)
【分类号】：TB65

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