热端管长度对涡流管流场影响的数值模拟研究  

Influence of Hot End Tube Length on Flow Field of Vortex Tube: A Simulation Study

作　　者：何丽娟[1] 孙尚志 马文清 王德超 潘鹏 田宝云[2] He Lijuan;Sun Shangzhi;Ma Wenqing;Wang Dechao;Pan Peng;Tian Baoyun(College of Environment and Energy,Inner Mongolia University of Science and Technology,Baotou 014010,China;Baotou Iron and Steel Vocational Technology College,Baotou,Inner Mongolia,Baotou 014010,China)

机构地区：[1]内蒙古科技大学能源与环境学院,包头014010 [2]包头钢铁职业技术学院,包头014010

出　　处：《真空科学与技术学报》2019年第2期163-168,共6页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(51106068);国家自然科学基金项目(51566014);内蒙古自治区自然科学基金项目(2015MS0547);内蒙古自治区科技创新引导奖励资金项目(2017CXYD-1)

摘　　要：以理想CO_2气体为工质,采用Standard k-ε湍流模型,对涡流管能量分离效应进行数值模拟,分析了管内流体流场的分布以及内旋流与外旋流分离界面的分布。在此基础上,探究了进口温度为298.15 K、进口压力为6.5 MPa、冷流率为0.1时,热端管长度对涡流管内流场分布以及能量分离性能的影响。模拟结果表明:热端管长度在100～200 mm范围内变化时,随着热端管长度的增大,轴向上:轴向速度逐渐增大,切向速度逐渐减小、径向上:轴向速度会出现运动方向相反的情况,切向速度先增大后减小,制冷温度效应呈现先增大后减小的趋势。The flow-field in a vortex tube,with ideal CO2 gas medium,was mathematically formulated with a standard k-ε turbulence model and numerically simulated.The influence of the hot end tube length on the flow-field distributions and energy separation was investigated under the conditions:298.15 K and 6.5 MPa at the inlet,and a cold flow-rate of 0.1.The simulated results show that the hot end tube length has a major impact.To be specific,as the length increases in 100~200 mm range,the axial velocity increases,accompanied by a decreasing tangential velocity;the interface,separating the distributions of internal/external swirling flows,changes in an increase-decrease manner;both the refrigeration and heating effects change in an increase-decrease mode.The optimized refrigeration(ΔTc=21.12 K) can be obtained with an aspect ratio of 25,that is,a length of 125 mm.

关 键 词：数值模拟 热端管长 流场分布 能量分离 

分 类 号：TB126[理学—工程力学]