摘要
为了给直接空冷散热器的优化设计和直接空冷机组的运行提供一定的参考,采用CFD方法,研究单排扁平管在不同迎面风速和环境温度条件下翅片通道内流场和温度场分布,得到空冷凝汽器冷却空气对流换热的表面换热系数和压损随迎面风速的变化规律,并通过拟合得到对应的关联式。结果表明:随着迎面风速的增加,表面对流换热系数和压降均有显著增加;环境温度的变化对空冷单元的散热量影响较大。研究结果对于直接空冷的运行设计具有重要的意义。
In order to provide references for the optimal design of radiator and operation of direct air-cooled condenser,the flow and heat transfer characteristics in fin channel are investigated by CFD simulation in this paper.The effects of face velocity and ambient temperature on heat transfer coefficient and pressure drop are discussed,of which the correlative expression are fitted.It is shown that both heat exchanger coefficient and pressure drop increase with the increase of the face velocity,and the ambient temperature has significant effect on heat dissipation capacity of the air-cooled cell.The results obtained are helpful for the design and operation of air-cooled system.
出处
《电力建设》
2011年第7期63-67,共5页
Electric Power Construction
关键词
空冷凝汽器
CFD模拟
扁平管
流动和传热
温度场
速度场
air-cooled condenser
CFD simulation
flat tube
flow and heat transfer
temperature field
velocity field
