竖直圆管内超临界碳氢燃料换热恶化的直径效应

doi:10.7527/S1000-6893.2016.0037

流行力学与飞行力学

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竖直圆管内超临界碳氢燃料换热恶化的直径效应

程泽源, 朱剑琴, 李海旺

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 100083

收稿日期:2015-09-29 修回日期:2016-11-16 出版日期:2016-10-15 发布日期:2016-02-23
通讯作者: 朱剑琴,Tel.:010-82339181 E-mail:zhujianqinbuaa@sina.com E-mail:zhujianqinbuaa@sina.com
作者简介:程泽源男,博士研究生。主要研究方向:超临界流动换热。Tel.:010-82339665 E-mail:cheng_zeyuan@buaa.edu.cn;朱剑琴女,博士,讲师,硕士生导师。主要研究方向:发动机热防护。Tel.:010-82339181 E-mail:zhujianqin@buaa.edu.cn;李海旺男,博士,副教授,博士生导师。主要研究方向:发动机热防护,微尺度传热及耦合布局。Tel.:010-82314379 E-mail:09620@buaa.edu.cn
基金资助:
国家自然科学基金（51406005）；国防基础科研项目（B2120132006）

Diameter effect on heat transfer deterioration of supercritical hydrocarbon fuel in vertical round tubes

CHENG Zeyuan, ZHU Jianqin, LI Haiwang

National Key Laboratory of Science and Technology on Aero-engine Aero-thermodynamics, School of Energy and Power Engineering, Beihang University, Beijing 100083, China

Received:2015-09-29 Revised:2016-11-16 Online:2016-10-15 Published:2016-02-23
Supported by:
National Natural Science Foundation of China (51406005); Defense Industrial Technology Development Program (B2120132006)

摘要/Abstract

摘要：

利用Fluent对超临界压力下直径对碳氢燃料换热恶化的影响进行数值研究，湍流模化采用Launder-Sharma（LS）低雷诺数模型，物性采用广义对应态法则对RP-3替代燃料计算。计算条件：系统压力为3 MPa，进口温度为573 K，热流密度为500 kW/m²，质量流量为0.001 5和0.003 0 kg/s，直径范围为1~10 mm。正常换热条件下的计算壁温和实验结果基本吻合，证明了计算方法的准确度。结果表明：强制对流下小质量流量时直径越大，换热恶化程度更高且更提前发生，换热恶化是由定压比热容处于极大值后的急剧下降区导致的，大质量流量时直径与壁温成正比，无换热恶化发生；浮升力效应仅在小质量流量下起作用，随着直径增大而加强，给出RP-3流动换热时浮升力起作用的判据和不同直径下换热恶化的边界。

关键词: 超临界, 碳氢燃料, 换热恶化, 直径, 浮升力

Abstract:

Numerical study of diameter effect of heat transfer deterioration of supercritical hydrocarbon fuel by using Fluent was conducted, LS low Reynolds turbulence model was used for turbulence modeling, and the physical properties of surrogate fuel of RP-3 were calculated according to extended corresponding state law. Computation conditions in this study are listed: the system pressure is 3 MPa, the inlet temperature is 573 K, the heat flux is 500 kW/m² and the mass flows are 0.001 5, 0.003 0 kg/s; the inner diameter ranges from 1 to 10 mm.The computation methods were proved to be accurate by good agreement between computed wall temperatures and experimental results under normal heat transfer. The results indicate that in the case of forced convection at low mass flow the heat transfer deterioration occurs more seriously and in more forward position with the larger diameter; the reason for heat transfer deterioration is that the specific heat is in sharp drop region after the maximum value, at high mass flow wall temperature is in positive proportion to tube diameter and there is no heat transfer deterioration occurring; the buoyancy effect works only in low mass flux cases and is enhanced with larger diameter; the criteria of the buoyancy effects working and the heat transfer deterioration boundary with tube diameters are given.

Key words: supercritical, hydrocarbon fuel, heat transfer deterioration, diameter, buoyancy

中图分类号:

V312+.1

程泽源, 朱剑琴, 李海旺. 竖直圆管内超临界碳氢燃料换热恶化的直径效应[J]. 航空学报, 2016, 37(10): 2941-2951.

CHENG Zeyuan, ZHU Jianqin, LI Haiwang. Diameter effect on heat transfer deterioration of supercritical hydrocarbon fuel in vertical round tubes[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(10): 2941-2951.

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E-mail：hkxb@buaa.edu.cn

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竖直圆管内超临界碳氢燃料换热恶化的直径效应

Diameter effect on heat transfer deterioration of supercritical hydrocarbon fuel in vertical round tubes

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