压力对超临界碳氢燃料换热恶化影响的数值研究

推进技术 ›› 2017, Vol. 38 ›› Issue (11): 2540-2547.

压力对超临界碳氢燃料换热恶化影响的数值研究

王龙云,朱剑琴,李海旺,程泽源

北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191,北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191,北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191,北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室，北京 100191

发布日期:2021-08-15
作者简介:王龙云，男，硕士生，研究领域为超临界流动换热。
基金资助:
国家自然科学基金(51406005)；国防基础科研计划资助(B2120132006)。

Numerical Study of Pressure Effect on Deterioration in Heat Transfer with Supercritical Hydrocarbon Fuel

National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100191，China,National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100191，China,National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100191，China and National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics，School of Energy and Power Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100191，China

Published:2021-08-15

摘要/Abstract

摘要： 为了研究竖直管道内压力对超临界碳氢燃料换热恶化的影响，采用数值模拟的方法，选择RP-3的四组分替代模型和LS低雷诺数湍流模型，分别从浮升力和物性的角度深入分析压力作用机理，并对比了直径2mm与10mm管道内压力的作用效果。各工况下计算结果与实验数据基本吻合，证实了计算方法的准确性。数值模拟结果表明:不考虑裂解结焦的情况下，系统压力超过5MPa后，碳氢燃料物性随温度变化趋于平缓，密度及比热容在管内不均匀性得到改善，同时壁面附近比热容平均值增大，使得管内换热恶化得到有效缓解；而在直径10mm管道内，热流从壁面到主流区传播减慢，管壁与管道轴心处流体温差最大可达300K，物性不均匀现象加剧，增大压力对换热恶化的缓解效果被削弱。

关键词: 超临界；碳氢燃料；换热恶化；变物性

Abstract: In order to study the pressure effect on heat transfer deterioration of supercritical hydrocarbon fuel in vertical tube，numerical method with four component surrogate model of RP-3 and LS low Reynolds turbulence model was carried out，buoyancy force and physical properties were focused to analyze mechanism of pressure effect，meanwhile comparisons between pipes of diameter 2mm and 10mm were done. The numerical results on wall temperature distribution under various conditions were compared with experimental data and a good agreement was obtained. Results of the research suggest that when pressure increase to 5MPa without concerning decomposition and coking，the change of physical properties tends to be gentle，the inhomogeneity of density and specific heat are alleviated，average of specific heat increases as well，which all make heat transfer deterioration alleviated. But in the pipe of diameter 10mm，fluid inside is harder to be heated and temperature difference between pipe wall and pipe axis is up to 300K，which leads to the increase of property inhomogeneity，pressure effect of alleviating heat transfer deterioration is weakened.

Key words: Supercritical；Hydrocarbon fuel；Heat transfer deterioration；Variable physical property

王龙云,朱剑琴,李海旺,程泽源. 压力对超临界碳氢燃料换热恶化影响的数值研究[J]. 推进技术, 2017, 38(11): 2540-2547.

WANG Long-yun,ZHU Jian-qin,LI Hai-wang,CHENG Ze-yuan. Numerical Study of Pressure Effect on Deterioration in Heat Transfer with Supercritical Hydrocarbon Fuel[J]. Journal of Propulsion Technology, 2017, 38(11): 2540-2547.

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