热端管长度对涡流管性能影响的实验研究  

An experimental study on effect of hot end tube length on vortex tube performance

作　　者：何丽娟[1] 赵辉通 李海燕 吴夏梦 He Lijuan;Zhao Huitong;Li Haiyan;Wu Xiameng(College of Environment and Energy,Inner Mongolia University of Science and Technology,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

出　　处：《低温工程》2021年第4期1-7,共7页Cryogenics

基　　金：国家自然科学基金项目(51106068、51566014);内蒙古自治区自然科学基金项目(2015MS0547、2021MS05035);内蒙古自治区科技创新引导奖励资金项目(2017CXYD-1)。

摘　　要：研究了不同热端管长度情况下涡流管的能量分离性能。实验中,采用纯度为99.99%二氧化碳为工质,进口压力为0.4 MPa。实验发现,在相同进口压力下,随着热端管长度的增加,涡流管制冷效应呈现先增大后减小的趋势,热端管长度为125 mm时具有最佳制冷温度效应,制热效应逐渐增大。同一管长时,轴向Z=12.5—50 mm壁温变化剧烈,热端出口附近壁面温度受回流影响较大,冷流率越大受回流影响越大。冷流率0.6、0.7时壁温随着管长的增大呈现先增大后减小的趋势,冷流率0.8时各管长壁温差别较小。The energy separation performance of vortex tubes with different hot end tube lengths was studied.In the experiment,carbon dioxide with a purity of 99.99%was used as the working medium,and the inlet pressure was 0.4MPa.It is found that with the increase of the length of hot end tube,the cooling effect of the vortex tube increases.It is observed that the cooling effect increases first with increase of the hot end tube length and then decreases under the same inlet pressure.The best cooling temperature effect is obtained as the hot end tube length is 125mm and the heat effect increases with it.For the same tube length,the wall temperature in the axial direction Z=12.5-50 mm changes drastically,and the wall surface temperature near the hot end exit is greatly affected by the reflow,and the larger the cold flow rate is affected by the reflow.When the cold flow rate is 0.6 and 0.7,the wall temperature increases first and then decreases with the increase of the tube length.When the cold flow rate is 0.8,there is little difference in the long wall temperature of each tube.

关 键 词：涡流管 热端管长度 能量分离 温度分布 

分 类 号：TB619.1[一般工业技术—制冷工程]