超临界压力RP-3在竖直细圆管内混合对流研究

贾洲侠; 徐国强; 闻洁; 龙晓东; 王越

doi:10.13700/j.bh.1001-5965.2015.0066

超临界压力RP-3在竖直细圆管内混合对流研究

doi: 10.13700/j.bh.1001-5965.2015.0066

北京航空航天大学航空发动机气动热力国家级重点实验室, 北京 100083

基金项目: 国家自然科学基金(50676005)

详细信息

作者简介:
贾洲侠男,博士研究生。主要研究方向:超临界压力流体流动与换热。E-mail:by1104106@buaa.edu.cn;徐国强男,教授。主要研究方向:航空发动机热防护、高效换热器、超临界流体流动与换热和太阳能光热发电等。Tel.:010-82317402E-mail:guoqiang_xu@buaa.edu.cn

通讯作者:
徐国强,Tel.:010-82317402E-mail:guoqiang_xu@buaa.edu.cn

中图分类号: V312
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出版历程
- 收稿日期: 2015-01-30
- 网络出版日期: 2016-01-20

Investigation of mixed convection of supercritical pressure RP-3 in vertical round tube

National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds: National Natural Science Foundation of China (50676005)

摘要

摘要: 研究了超临界压力下碳氢燃料航空煤油RP-3在竖直细圆管内混合对流,分析了浮升力及热物性对碳氢燃料在垂直管中对流换热的影响。实验中控制热流密度从200~500 kW/m²变化,进口压力变化范围为3~5 MPa,进口雷诺数从5 000~10 500范围内变化。研究表明:在向上流动情况中进口段存在较为明显的入口效应,换热出现恶化现象,而在向下流动中未出现;对于向上和向下流动,由于热物性的综合影响,换热系数沿流动方向增大;在较低进口雷诺数(Re=5 700)时,对于向下流动,随着浮升力影响的增大,浮升力改变了流体径向速度分布,出现了换热强化;在较高进口雷诺数(Re=10 500)时,浮升力对换热的影响依然显著;判别式Bo^*数小于5.6×10^-7未能预测浮升力对碳氢燃料换热影响。
- 混合对流 /
- 热物性 /
- 超临界 /
- RP-3 /
- 浮升力
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.
- mixed convection /
- thermophysical properties /
- supercritical /
- RP-3 /
- buoyancy

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参考文献(14)

[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.