地热能提取系统中超长重力热管蒸发段数值模拟研究  

Numerical Simulation of Evaporation Section of Ultra-long Gravity Heat Pipe in Geothermal Energy Extraction System

作　　者：吴琼 虞斌[1] 周帆 吴敬宇 许蕾 WU Qiong;YU Bin;ZHOU Fan;WU Jing-yu;XU Lei(College of Mechanical and Power Engineering,Nanjing Tech University)

机构地区：[1]南京工业大学机械与动力工程学院

出　　处：《化工机械》2022年第4期642-647,共6页Chemical Engineering & Machinery

摘　　要：基于增强型地热系统设计一种超长重力热管与分离式热管相结合来提取干热岩地热能的系统,采用计算流体力学方法对超长重力热管蒸发段进行流动特性和传热性能数值模拟研究。结果表明:不同管径下的对流换热系数呈现先下降后平稳的趋势,其最佳管径为0.3 m;对流换热系数随着充液率的增加而增加,其最佳充液率在25%~30%之间;对流换热系数随着璧温的增加而增加。Based on the enhanced geothermal system,a system which has the ultra-long gravity heat pipe combined with separate heat pipe was designed to extract hot-dry-rock heat energy.Through adopting computational fluid dynamics,simulating flow characteristics and heat transfer performance of the ultra-long gravity heat pipe's evaporation section was implemented to show that,the convective heat transfer coefficient decreases first and then stabilizes at different pipe diameters,and the optimal pipe diameter is 0.3 m;the convective heat transfer coefficient increases with increasing of liquid-filling rate and the optimal liquidfilling rate stays between 25%and 30%and the convective heat transfer coefficient would increase with the rise of the pipe wall temperature.

关 键 词：超长重力热管 蒸发段 干热岩地热 数值模拟 

分 类 号：TQ051.6[化学工程]