超临界压力RP-3起始加热段传热恶化数值研究
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摘要
使用开源流体动力学程序库OpenFOAM对竖直圆管内超临界压力RP-3对流传热进行数值模拟,研究重点为起始加热段的传热恶化现象。本文选择k-ε-v~2-f和k-ωSST两种低Re数湍流模型进行计算并与实验数据进行对比,讨论了两种模型对于高壁面热流条件下传热恶化现象的预测能力.通过对流场及温度场的分析对起始加热段传热恶化现象给出机理解释,最后考察了变物性及浮升力的影响。结果表明:k-ωSST模型无法模拟传热恶化;k-ε-v~2-f模型能够定性描述起始加热段内壁温的迅速升高。由流体密度变化及重力引起的浮升力作用是导致起始加热段传热恶化的重要原因。
The open source CFD toolbox OpenFOAM was used to simulate convective heat transfer of RP-3 flowing in a vertical tube under supercritical pressure. Heat transfer deterioration(HTD)in the initial heating region was studied. Two types of low-Reynolds number turbulence models(k-ε-v~2-f and k-ω SST model) were used in the simulation. Numerical results were compared against the experimental data to examine the accuracy of turbulence models in predicting HTD under large wall heat fluxes. The flow field and temperature field were analyzed to propose a mechanism for explaining HTD. The effects of property variations and buoyancy forces were also investigated.It was concluded that the k-ω SST model was incapable to predict HTD. The k-ε-v~2-f model was able to qualitatively describe the rapid increase of inner wall temperature in the initial heating region. The buoyancy forces caused by density variation and gravity is the main cause of HTD.
The open source CFD toolbox OpenFOAM was used to simulate convective heat transfer of RP-3 flowing in a vertical tube under supercritical pressure. Heat transfer deterioration(HTD)in the initial heating region was studied. Two types of low-Reynolds number turbulence models(k-ε-v~2-f and k-ω SST model) were used in the simulation. Numerical results were compared against the experimental data to examine the accuracy of turbulence models in predicting HTD under large wall heat fluxes. The flow field and temperature field were analyzed to propose a mechanism for explaining HTD. The effects of property variations and buoyancy forces were also investigated.It was concluded that the k-ω SST model was incapable to predict HTD. The k-ε-v~2-f model was able to qualitatively describe the rapid increase of inner wall temperature in the initial heating region. The buoyancy forces caused by density variation and gravity is the main cause of HTD.
引文
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[2]Fry R S.A Century of Ramjet Propulsion Technology Evolution[J].Journal of Propulsion and Power,2004,20(1):27-58
[3]Edwards T.Liquid Fuels and Propellants for Aerospace Propulsion:1903-2003[J].Journal of Propulsion and Power,2003,19(6):1089-1107
[4]ZHONG Fengquan,FAN Xuejun,YU Gong,et al.Heat Transfer of Aviation Kerosene at Supercritical Conditions[J].Journal of Thermophysics and Heat Transfer,2009,23(3):543-550
[5]HUA Yixin,WANG Yazhou,MENG Hua.A Numerical Study of Supercritical Forced Convective Heat Transfer of n-Heptane Inside a Horizontal Miniature Tube[J].The Journal of Supercritical Fluids,2010,52(1):36-46
[6]He S,Kim W S,Bae J H.Assessment of Performance of Turbulence Models in Predicting Supercritical Pressure Heat Transfer in a Vertical Tube[J].International Journal of Heat and Mass Transfer,2008,51(19/20):4659-4675
[7]Pioro I L,Duffey R B.Experimental Heat Transfer in Supercritical Water Flowing Inside Channels(Survey)[J].Nuclear Engineering and Design,2005,235(22):2407-2430
[8]He S,Kim W S,Jackson J D.A Computational Study of Convective Heat Transfer to Carbon Dioxide at a Pressure Just Above the Critical Value[J].Applied Thermal Engineering,2008,28(13):1662-1675
[9]张斌,张春本,邓宏武,等.超临界压力下碳氢燃料在竖直圆管内换热特性[J].航空动力学报,2012,27(03):595-603ZHANG Bin,ZHANG Chunben,DENG Hongwu,et al.Heat Transfer Characteristics of Hydrocarbon Fuel at Supercritical Pressure in Vertical Circular Tubes[J].Journal of Aerospace Power,2012,27(03):595-603
[10]ZHANG Chunben,XU Guoqiang,GAO Lin,et al.Experimental Investigation on Heat Transfer of a Specific Fuel(RP-3)Flows Through Downward Tubes at Supercritical Pressure[J].The Journal of Supercritical Fluids,2012,72:90-99
[11]LI Wei,HUANG Dan,XU Guoqiang,et al.Heat Transfer to Aviation Kerosene Flowing Upward in Smooth Tubes at Supercritical Pressures[J].International Journal of Heat and Mass Transfer,2015,85:1084-1094
[12]刘波,王夕,祝银海,等.超临界压力下正癸烷在微细圆管内对流换热实验研究[J].工程热物理学报,2014,35(01):114-118LIU Bo,WANG Xi,ZHU Yinhai,et al.Experimental Investigation of Convection Heat Transfer of n-Decane at Supercritical Pressures in a Micro/Mini Vertical Tube[J].Journal of Engineering Thermophysics,2014,35(01):114-118
[13]DANG Guoxin,ZHONG Fengquan,CHEN Lihong,et al.Numerical Investigation on Flow and Convective Heat Transfer of Aviation Kerosene at Supercritical Conditions[J].Science China Technological Sciences,2013,56(2):416-422
[14]Jiang H,Ervin J,West Z,et al.Turbulent Flow,Heat Transfer Deterioration,and Thermal Oxidation of Jet Fuel[J].Journal of Thermophysics and Heat Transfer,2013,27(4):668-678
[15]DENG Hongwu,ZHANG Chunben,XU Guoqiang,et al.Visualization Experiments of a Specific Fuel Flow Through Quartz-glass Tubes Under both Sub-and Supercritical Conditions[J].Chinese Journal of Aeronautics,2012,03(03):372-380
[16]DENG Hongwu,ZHANG Chunben,XU Guoqiang,et al.Density Measurements of Endothermic Hydrocarbon Fuel at Sub-and Supercritical Conditions[J].Journal of Chemical&Engineering Data,2011,56(6):2980-2986
[17]DENG Hongwu,ZHANG Chunben,XU Guoqiang,et al.Viscosity Measurements of Endothermic Hydrocarbon Fuel from(298 to 788)K under Supercritical PressureConditions[J].Journal of Chemical&Engineering Data,2012,57(2):358-365
[18]DENG Hongwu,ZHU Kun,XU Guoqiang,et al.Isobaric Specific Heat Capacity Measurement for Kerosene RP-3 in the Near-Critical and Supercritical Regions[J].Journal of Chemical&Engineering Data,2011,57(2):263-268
[19]Lien F-S,Kalitzin G.Computations of Transonic Flow with the v2-f Turbulence Model[J].International Journal of Heat and Fluid Flow,2001,22(1):53-61
[20]Menter F R.Two-Equation Eddy-Vscosity Turbulence Models for Engineering Applications[J].AIAA Journal,1994,32(8):1598-1605
[21]Daly B J,Harlow F H.Transport Equations in Turbulence[J].Physics of Fluids,1970,13(11):2634-2649
[22]Kim W S,He S,Jackson J D.Assessment by Comparison with DNS Data of Turbulence Models Used in Simulations of Mixed Convection[J].International Journal of Heat&Mass Transfer,2008,51(5/6):1293-1312