摘要
使用开源流体动力学程序库OpenFOAM对竖直圆管内超临界压力RP-3对流传热进行数值模拟,研究重点为起始加热段的传热恶化现象。本文选择k-ε-v^2-f和k-ωSST两种低Re数湍流模型进行计算并与实验数据进行对比,讨论了两种模型对于高壁面热流条件下传热恶化现象的预测能力.通过对流场及温度场的分析对起始加热段传热恶化现象给出机理解释,最后考察了变物性及浮升力的影响。结果表明:k-ωSST模型无法模拟传热恶化;k-ε-v^2-f模型能够定性描述起始加热段内壁温的迅速升高。由流体密度变化及重力引起的浮升力作用是导致起始加热段传热恶化的重要原因。
The open source CFD toolbox OpenFOAM was used to simulate convective heat transfer of RP-3 flowing in a vertical tube under supercritical pressure. Heat transfer deterioration（HTD）in the initial heating region was studied. Two types of low-Reynolds number turbulence models（k-ε-v^2-f and k-ω SST model） were used in the simulation. Numerical results were compared against the experimental data to examine the accuracy of turbulence models in predicting HTD under large wall heat fluxes. The flow field and temperature field were analyzed to propose a mechanism for explaining HTD. The effects of property variations and buoyancy forces were also investigated.It was concluded that the k-ω SST model was incapable to predict HTD. The k-ε-v^2-f model was able to qualitatively describe the rapid increase of inner wall temperature in the initial heating region. The buoyancy forces caused by density variation and gravity is the main cause of HTD.
作者
浦航
李素芬
东明
尚妍
焦思
PU Hang LI Su-Fen DONG Ming SHANG Yan JIAO Si(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第10期2242-2248,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51576027)
关键词
超临界压力流体
对流换热
数值计算
RP-3
supercritical pressure fluid
convective heat transfer
numerical computation
RP-3
