三角扰流蛇形翅片管流动换热特性数值研究  

Numerical Investigations on the Heat Transfer and Fluid Flow of Tri-angle Wave-finned Tube

作　　者：李书营[1] 陈梅倩[2] 杨飞[2] 董瑞[2] 周敬博[2] 

机构地区：[1]郑州铁路职业技术学院机车车辆系,郑州450003 [2]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《汽轮机技术》2011年第2期115-118,共4页Turbine Technology

摘　　要：蛇形翅片管作为空冷凝汽器基本换热面，其流动与换热性能对空冷电站经济性有着重要影响，基于此，对三角扰流蛇形翅片管的气侧换热及流动特性进行了数值研究，分析了流体温度、压力沿流程方向的变化规律以及迎面风速、扰流三角个数、扰流三角尺寸等因素对蛇形翅片管换热及流动性能的影响，结果表明三角扰流部位局部阻力是沿程阻力的25％～70％，扰流三角对换热有明显的促进作用，换热系数最大提高37％。本研究可为蛇形翅片管的设计及优化提供理论参考。Wave - fin tubes, worked as an important part of air-cooled condenser, influence the economic of power plant much. The air-side heat transfer and fluid flow of tri-angle wave-finned tube have been investigated numerically. Variations of temperature and pressure along flow direction are analyzed. The wind flow velocity, dimension and sum of tri-angle which influence the heat transfer and fluid flow of finned-tube are analyzed. The result show that partial pressure drop is 25% - 70% of way pressure drop,and that the heat transfer coefficient is improved 37% by the tri-angle. The current results can serve as the reference for the design and optimization of the finned-tube.

关 键 词：直接空冷 蛇形翅片 换热与流动 数值模拟 

分 类 号：TK172[动力工程及工程热物理—热能工程]