超临界参数CO2在倾斜管内对流换热数值模拟  

Numerical simulation of convective heat transfer for supercritical CO_2 in inclined tubes

作　　者：杨传勇 徐进良 王晓东 张伟 

机构地区：[1]能源的安全与清洁利用北京市重点实验室,北京102206 [2]新能源电力系统国家重点实验室,北京102206 [3]低品位能源多相流与传热北京市重点实验室,北京102206

出　　处：《热力发电》2013年第1期26-35,共10页Thermal Power Generation

基　　金：国家自然科学基金-广东省联合基金重点项目(U1034004);国家自然科学基金(No.51006035);国家杰出青年科学基金资助项目(No.50825603)~~

摘　　要：对倾角为30°的倾斜圆管内超临界参数CO2的对流换热过程进行数值模拟,分析了管壁热流量和入口质量流量对换热特性的影响。利用相对二次流动能定量表示二次流大小,得到了壁温和传热系数周向分布规律以及上母线传热系数、摩擦系数和相对二次流动能K沿管道的分布规律。模拟结果表明,上母线壁温高于下母线,顶部周向壁面温度高于底部,壁面热流量对上母线的传热系数、摩擦系数和相对二次流动能影响较小,入口质量流量对其影响较大。Numerical simulation of convective heat transfer for supercritical CO2 in circle tubes with an inclination of 30° was determined to investigate the influence of heat flux and inlet mass flow rate on the heat transfer characteristics.Using the relative secondary flow kinetic energy K to express the secondary flow intensity quantitatively,the distribution of tube wall temperature and heat transfer coefficient in tube circumference,the heat transfer coefficient at top generatrix,the Fanning friction factor and the relative secondary flow kinetic energy K were obtained.The results showed that,the tube wall temperature at top generatrix was higher than that at the bottom generatrix,and the top circumferential wall temperature was higher than that at the bottom.The heat flux had less effect on heat transfer coefficient,the Fanning friction factor,and the relative secondary flow kinetic energy K at top generatrix,but the influence of inlet mass flow on them was greater.

关 键 词：倾斜管 超临界参数 CO2 浮升力 对流换热 二次流动能 壁温 

分 类 号：TK124[动力工程及工程热物理—工程热物理]