超临界压力下竖直圆管内正癸烷对流换热不稳定性实验
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摘要
以超临界压力正癸烷为工质,在内径2mm的竖直圆管内进行了不同工况条件下的流动与换热不稳定性实验研究。实验发现两种原理的不稳定性现象。转捩型是由于流动状态由层流向湍流转变引起,多为随机的小幅震荡,约在Re=5000左右出现;物性型由准临界温度附近剧烈变化物性所致,具有较大振幅和固定周期,约8~15s。增强系统稳定性的方法主要包括提高进口流体温度、升高压力或者采用向下流动方式。实验还发现在振荡区间内存在稳定区间现象。
This work presents the experimental studies on the flow and heat transfer instabilities of supercritical pressure n-decane in a vertical tube with an inner diameter of 2mm at various conditions. Two types of instabilities were observed,including the transition pattern and the thermal property pattern. The transition pattern was caused by the transition of flow from laminar flow to turbulent flow with random and relatively small amplitudes when Re was about 5000,while the thermal property pattern was caused by the variation of thermal properties near pseudo critical temperature with large amplitudes and constant periods of 8 to 15 seconds. Raising the inlet bulk fluid temperature,raising the pressure or using downward direction may make the system more stable.The stable sections were also observed in the experiments.
This work presents the experimental studies on the flow and heat transfer instabilities of supercritical pressure n-decane in a vertical tube with an inner diameter of 2mm at various conditions. Two types of instabilities were observed,including the transition pattern and the thermal property pattern. The transition pattern was caused by the transition of flow from laminar flow to turbulent flow with random and relatively small amplitudes when Re was about 5000,while the thermal property pattern was caused by the variation of thermal properties near pseudo critical temperature with large amplitudes and constant periods of 8 to 15 seconds. Raising the inlet bulk fluid temperature,raising the pressure or using downward direction may make the system more stable.The stable sections were also observed in the experiments.
引文
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[18]王彦红,李素芬,东明,等.超临界压力航空煤油热声振荡与传热恶化实验研究[J].推进技术,2016,37(3):401-410.(WANG Yan-hong,LI Su-fen,DONG Ming,et al.Experimental Studies on Thermoacoustic Oscillation and Heat Transfer Deterioration of Aviation Kerosene under Supercritical Pressure[J].Journal of Propulsion Technology,2016,37(3):401-410.)
[19]YAN Jun-jie,ZHU Yin-hai,LU Ze-long,et al.Transient Response of Supercritical Pressure Hydrocarbon Fuels during Heating Condition[J].CIESC Journal,2015,66(S1):65-70.
[2]Huang He,Spadaccini L J,Sobel D R.Fuel-Cooled Thermal Management for Advanced Aeroengines[J].Journal of Engineering for Gas Turbines and Power,2004,126(2):284-293.
[3]Jackson J D,Hall W B.Forced Convection Heat Transfer to Fluids at Supercritical Pressure[C].New York:Hemisphere Publishing Corporation,1979:563-611.
[4]Jackson J D,Hall W B.Influences of Buoyancy on Heat Transfer to Fluids Flowing in Vertical Tubes under Turbulent Conditions[C].New York:Hemisphere Publishing Corporation,1979:613-640.
[5]JIANG Pei-xue,ZHANG Yu,XU Yi-jun,et al.Experimental and Numerical Investigation of Convection Heat Transfer of CO2at Supercritical Pressures in a Vertical Tube at Low Reynolds Numbers[J].International Journal of Thermal Sciences,2008,47(8):998-1011.
[6]JIANG Pei-xue,ZHANG Yu,ZHAO Chen-ru,et al.Convection Heat Transfer of CO2at Supercritical Pressures in a Vertical Mini Tube at Relatively Low Reynolds Numbers[J].Experimental Thermal and Fluid Science,2008,32(8):1628-1637.
[7]Pidaparti S,Mc Farland J.Effect of Buoyancy on Heat Transfer Characteristics of Supercritical Carbon Dioxide in the Heating Mode[R].AIAA 2014-3359.
[8]LIU Bo,ZHU Yin-hai,YAN Jun-jie,et al.Experimental Investigation of Convection Heat Transfer of nDecane at Supercritical Pressures in Small Vertical Tubes[J].International Journal of Heat and Mass Transfer,2015,91:734-746.
[9]赵国柱,宋文艳,张若凌,等.超临界压力下正十烷流动传热的数值模拟[J].推进技术,2014,35(4):537-543.(ZHAO Guo-zhu,SONG Wen-yan,ZHANG Ruo-ling,et al.Numerical Simulation on Flow and Heat Transfer of n-Decane under Supercritical Pressure[J].Journal of Propulsion Technology,2014,35(4):537-543.)
[10]Hitch B,Karpuk M.Experimental Investigation of Heat Transfer and Dlow Instabilities in Supercritical Fuels[R].AIAA 97-3043.
[11]Hitch B,Karpuk M.Enhancement of Heat Transfer and Elimination of Flow Oscillations in Supercritical Fuels[R].AIAA 98-3759.
[12]Ambrosini W,Sharabi M.Dimensionless Parameters in Stability Analysis of Heated Channels with Fluids at Supercritical Pressures[J].Nuclear Engineering and Design,2008,238(8):1917-1929.
[13]Sharabi M,Ambrosini W,He S,et al.Transient Three-Dimensional Stability Analysis of Supercritical Water Reactor Rod Bundle Subchannels by a Computatonal Fluid Dynamics Code[J].Journal of Engineering for Gas Turbines and Power,2009,131(2).
[14]Ambrosini W.On the Analogies in the Dynamic Behaviour of Heated Channels with Boiling and Supercritical Fluids[J].Nuclear Engineering and Design,2007,237(11):1164-1174.
[15]Ambrosini W.Discussion on the Stability of Heated Channels with Different Fluids at Supercritical Pressures[J].Nuclear Engineering and Design,2009,239(12):2952-2963.
[16]Hunt S,Heister S D.Thermoacoustic Oscillations in Supercritical Fuel Flows[R].AIAA 2014-3973.
[17]Stewart E,Stewart P,Watson A.Thermo-Acoustic Oscillations in Forced Convection Heat Transfer to Supercritical Pressure Water[J].International Journal of Heat and Mass Transfer,1973,16(2):257-270.
[18]王彦红,李素芬,东明,等.超临界压力航空煤油热声振荡与传热恶化实验研究[J].推进技术,2016,37(3):401-410.(WANG Yan-hong,LI Su-fen,DONG Ming,et al.Experimental Studies on Thermoacoustic Oscillation and Heat Transfer Deterioration of Aviation Kerosene under Supercritical Pressure[J].Journal of Propulsion Technology,2016,37(3):401-410.)
[19]YAN Jun-jie,ZHU Yin-hai,LU Ze-long,et al.Transient Response of Supercritical Pressure Hydrocarbon Fuels during Heating Condition[J].CIESC Journal,2015,66(S1):65-70.