Investigation of mixed convection of supercritical pressure RP-3 in vertical round tube
JIA Zhouxia, XU Guoqiang, WEN Jie, LONG Xiaodong, WANG Yue
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
Abstract:The mixed convection research of supercritical pressure hydrocarbon aviation fuel RP-3 in vertical tube was conducted and the effects of buoyancy and thermophysical properties on convection was investigated. The wall heat fluxes (200-500 kW/m2), inlet pressure (3-5 MPa) and inlet Reynolds number (5 000-10 500) were maintained in the experiments. The study shows that heat transfer impairment occurrs in inlet region for all upward flow conditions due to buoyancy effects, which is not observed in the downward flow. The heat transfer coefficient increases as the fluid bulk temperature increased as a result of comprehensive effects of thermophysical properties. At lower inlet Reynolds number (5 700), the radial velocity profile changes in downward flow conditions leading to heat transfer enhancement due to buoyancy effects. The buoyancy effects are also significant for higher inlet Reynolds number (10 500). The criterion equation (Bo* < 5.6×10-7) failed to evaluate buoyancy effects on hydrocarbon fuel heat transfer.
贾洲侠, 徐国强, 闻洁, 龙晓东, 王越. 超临界压力RP-3在竖直细圆管内混合对流研究[J]. 北京航空航天大学学报, 2016, 42(1): 152-157.
JIA Zhouxia, XU Guoqiang, WEN Jie, LONG Xiaodong, WANG Yue. Investigation of mixed convection of supercritical pressure RP-3 in vertical round tube. JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2016, 42(1): 152-157.
[1] BRUENING G B,CHANG W S.Cooled cooling air systems for turbine thermal management:ASME 1999-GT-14[R].New York:ASME,1999.
[2] JIANG P X,SHI R F,ZHAO C R,et al.Experimental and numerical study of convection heat transfer of CO2 at supercritical pressures in vertical porous tubes[J].International Journal of Heat and Mass Transfer,2008,51(25-26):6283-6293.
[3] JIANG P X,ZHANG Y,SHI R F.Experimental and numerical investigation of convection heat transfer of CO2 at supercritical pressures in a vertical mini-tube[J].International Journal of Heat and Mass Transfer,2008,51(11-12):3052-3056.
[4] 李志辉.超临界压力CO2在微细圆管中流动与换热研究[D].北京:清华大学,2008:24-26. LI Z H.Research on convection heat transfer of CO2 at supercritical pressures in mini/micro scale tubes[D].Beijing:Tsinghua University,2008:24-26(in Chinese).
[5] LIAO S M,ZHAO T S.An experimental investigation of convection heat transfer to supercritical carbon dioxide in miniature tubes[J].International Journal of Heat and Mass Transfer,2002,45(25):5025-5034.
[6] LIAO S M,ZHAO T S.Measurements of heat transfer coefficients from supercritical carbon dioxide flowing in horizontal mini/micro channels[J].Journal of Heat Transfer,2002,124(3):413-420.
[7] JACKSON J D,HALL W B.Influence of buoyancy on heat transfer to fluids flowing in vertical tubes under turbulent conditions[C]//Turbulent Forced Convection in Channels and Bundles.Washington,D.C.:Hemisphere Publ Corp.,1979,2:613-640.
[8] DENG H W,ZHANG C B,XU G Q,et al.Density measurements of endothermic hydrocarbon fuel at sub-and supercritical conditions[J].Journal of Chemical & Engineering Data,2011,56(6):2980-2986
[9] 王英杰.超临界RP-3流动换热及结焦实验研究[D].北京:北京航空航天大学,2010:65-66. WANG Y J.Experimental investigation on convection heat transfer and coke chracteristics of RP-3 at supercritical pressures[D].Beijing:Beihang University,2010:65-66(in Chinese).
[10] ZHONG F,FAN X,YU G,et al.Heat transfer of aviation kerosene at supercritical conditions[J].Journal of Thermophysics and Heat Transfer,2009,23(3):543-550
[11] PETUKHOV B S.Heat transfer and friction in turbulent pipe flow with variable physicals properties[C]//HATRNETT J P,IRVINE T F.Advances in Heat Transfer.San Diego:Academic Press,1970:45-50.
[12] 张春本,邓宏武,徐国强,等.超临界压力下航空煤油RP-3焓值的测量及换热研究[J].航空动力学报,2010,25(2):331-335. ZHANG C B,DENG H W,XU G Q,et al.The enthalpy measurement and heat transfer investigation of RP-3 kerosene at supercritical pressure[J].Journal of Aerospace Power,2010,25(2):331-335(in Chinese).
[13] MCELIGOT D M,COON C W,PERKINS H C.Relaminarization in tubes[J].International Journal of Heat and Mass Transfer,1970,13(2):431-433.
[14] MCELIGOT D M,JACKSON J D."Deterioration" criteria for convective heat transfer in gas flow through non-circular ducts[J].Nuclear Engineering and Design,2004,232(3):327-333.