摘要
以理想CO_2气体为工质,采用Standard k-ε湍流模型对涡流管冷热分离效应进行数值模拟。通过分析管内工质流动状态和温度、压力的分布,发现:CO_2气体在内层强制涡区与外层自由涡区不断的进行热质交换,促进涡流管发生能量分离。在此基础上,探究进口温度为298.15 K、进口压力为6.5 MPa,冷流比在0.3~0.9范围变化时,冷孔板孔径对涡流管制冷制热性能的影响,模拟结果发现:冷孔板孔径在1.7~2.62 mm范围内变化时,随着冷孔板孔径的增大,涡流管的制冷效应和制热效应逐渐增大,且当冷孔板孔径为2.62 mm时,涡流管获得最大总温差36.83 K。
Abstract The flow field of CO2 gas in a vortex tube was mathematically formulated with standard κ-ε turbulence model,theoretically analyzed and numerically simulated with software CFD. The impact of the known variables, including the temperature and pressure at the input, cold mass ratio and cold orifice diameter, on the cooling/ heating of the vortex tube was investigated. The simulated results show that a continuous CO2 heat/mass exchange between the inner forced-vortex and outer free-vortex zones explains the energy separation of the vortex tube; and that the cold orifice diameter significantly affects the cooling/heating. For example, as the cold orifice diameter increases from 1.7 to 2. 62 mm, the temperature difference increases because of the cooling/heating. With a diameter of 2.62 mm and a cold mass ratio of 0. 9 ,the temperature difference of the vortex tube is 36.83 K. Keywords Cold orifice diameter, Vortex tube, Carbon dioxide, Numerical simulation
作者
何丽娟
潘鹏
黄艳伟
孙尚志
He Lijuan, Pan Peng, Huang Yanwei, Sun Shagnzhi(College of Environment and Energy, Inner Mongolia University of Science and Technology, Baotou 014010, China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2018年第3期252-257,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(2015MS0547)
关键词
冷孔板孔径
涡流管
CO2
数值模拟
Cold orifice diameter, Vortex tube, Carbon dioxide, Numerical simulation
