喷嘴流道数对涡流管内部温度、压力分布的影响
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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,分析了管内流体总温、总压的分布。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,喷嘴流道数对涡流管内总温、总压分布以及能量分离性能的影响。模拟结果表明:喷嘴流道数在2-6范围内变化时,轴向上:总温、总压先减小后增大、径向上:总温、总压先减小后增大,制冷温度效应先增大后减小,当喷嘴流道数为3时具有最佳制冷制热温度效应。
The energy separation by a vortex tube,with ideal CO_2 gas medium,was mathematically formulated with a standard k-ε turbulence model and numerically simulated.The influence of the nozzle flow path number on the flow field profiles and energy separation was investigated under the conditions,including an inlet temperature of 298.15 K,an inlet pressure of 6.5 MPa and a cold flow rate of 0.1.The simulated results show that the nozzle flow path number significantly affects the refrigeration and heating of the vortex tube.For example,as the flow path number increases from 2 to 6,both the axial/radial temperature and pressure distributions change in a decrease-increase manner,resulting in an increase-decrease variation of refrigeration.An optimized nozzle flow path number of 3 accounts for the most effective refrigeration and heating of the vortex tube.
The energy separation by a vortex tube,with ideal CO_2 gas medium,was mathematically formulated with a standard k-ε turbulence model and numerically simulated.The influence of the nozzle flow path number on the flow field profiles and energy separation was investigated under the conditions,including an inlet temperature of 298.15 K,an inlet pressure of 6.5 MPa and a cold flow rate of 0.1.The simulated results show that the nozzle flow path number significantly affects the refrigeration and heating of the vortex tube.For example,as the flow path number increases from 2 to 6,both the axial/radial temperature and pressure distributions change in a decrease-increase manner,resulting in an increase-decrease variation of refrigeration.An optimized nozzle flow path number of 3 accounts for the most effective refrigeration and heating of the vortex tube.
引文
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[2] Thomas T Bruno.Simple,inexpensive Apparatus for Sample Concentration[J].Journal of Chemical Education,1992,69(10):837-838
[3] Brock Hajdik,Manfred Lorey.Vortex Tube can Increase Liquid Hydrocarbon Recovery at Plant Inlet[J].Oil&GAS Journal,1997,95(36):76-83
[4] Choi H Z,Lee S W,Jeong H D.A Comparison of Thecooling Effects of Compressed Cold Air and Coolantfor Cylindrical Grinding with a CBN Wheel[J].Journal of Materials Processing Technology,2001,11:265-268
[5] Krasovitaski R,Tunekl L.Vortex Heat Exchanger:Design,Experiment and Mathematical Model[J].Journal of Enhanced Heat Transfer,2001,8(1):15-22
[6] Westley R.Optimum Design of a Vortex Tube for Achieving Larger Temperature Drop Ratios[J].Cranfield College Note30,College of Aeronautics,1955
[7] Heishichiro Takahama.Studies on Vortex Tube[J].Bulletin of JSME,1965,8(31):433-440
[8] 唐玉立,王亚芳,孙大坤,等.涡流管制冷的喷嘴效应[J].低温工程,1997,(06):23-30
[9] Parulekar B B.The Short Vortex Tube[J].The Journal of Refrigeration,1961,(4):74-78
[10] 何曙,吴玉庭,姜曙,等.喷嘴对涡流管能量分离效应影响[J].化工学报,2005,56(11):2073-2076
[11] 蔡洁,姜任秋,周少伟,等.涡流管能量分离过程实验研究[J].工程热物理学报,2005,26:1-4
[12] 王远鹏,林明峰,赵金超,等.喷嘴流道数对涡流管能量分离特性影响的研究[J].流体机械,2007,35(11):59-61
[13] Attalla M,Ahmed Hany,Ahmed Salem M.An Experimental Study of Nozzle Number on Ranque Hilsch Counter-Flow Vortex Tube[J].Experimental Thermal and Fluid Science,2017,82:381-389
[14] 曹勇.小流量涡流管特性的理论与实验研究[D].杭州:浙江大学,2003
[15] Skye H M,Nellis G F,Klein S A.Comparison of CFD Analysis to Empirical Data in a Commercial Vortex Tube[J].International Journal of Refrigeration,2006,29(1):71-80
[16] Thakare H R,Parekh A D.CFD Analysis of Energy Separation of Vortex Tube Employing Differentgases,Turbulence Models and Discretisationschemes[J].International Journal of Heat and Mass Transfer,2014,78:360-370
[17] Dutta T,Sinhamahapatra K P,Bandyopdhyay S S.Comparison of Different Turbulence Models in Predicting the Temperature Separation in a Ranque-Hilsch Vortex Tube[J].International Journal of Refrigeration,2012,33:783-792
[18] Aljuwayhel N F,Nellis G F,Klein S A.Parametric and Internal Study of the Vortex Tube Using a CFD Model[J].International Journal of Refrigeration,2005,28:442-450
[19] 周少伟,姜任秋,宋福元,等.涡流管内三维强旋流流场数值模拟[J].机械工程学报,2007,(12):229-234
[20] 周少伟.涡流管能量分离效应的理论与试研[D].哈尔滨:哈尔滨工程大学,2007
[21] 许敏宇,张景松,雷蕾,等.涡流管制冷试验分析[J].流体机械,2011,39(05):78-80