摘要
针对某600MW直接空冷凝汽器单元的典型结构,建立了在风机出口安装空气导流板的空冷单元物理模型,利用Fluent软件对加装导流板前后空冷单元的内部流场进行了数值模拟,分析了不同导流板数量和形状对内部空气流动和传热特性的影响.结果表明:在空冷单元风机出口加装一定数量和形状的导流板能提高冷却空气流场的均匀性,降低管束表面局部高温区的温度,从而提高空冷凝汽器的换热效果;安装8块导流板时效果最好,且弓形导流板对空冷凝汽器散热效果的改善要比长方形导流板和弯曲面形导流板更为明显.
Based on typical structure of a 600 MW direct air-cooled condenser,physical models were established for the air-cooled unit with guide plates installed at the fan outlet,with which numerical simulations were performed to the flow field inside the air-cooled unit with and without guide plates,so as to analyze the effects of guide plate number and shape on its internal aerodynamic flow field and heat-transfer characteristics.Results show that the flow field of cooling air can be uniformly distributed by installing a certain number and shape of guide plates at fan outlet,which may help to reduce local high temperatures on tube bundle surface,and therefore to improve the heat-transfer effect of air-cooled condenser.adding eight pieces of guide plate will produce the best effect,and among arched,rectangular and cambered guide plate,the arched one is proved to be the most effective.
出处
《动力工程学报》
CAS
CSCD
北大核心
2014年第7期551-555,共5页
Journal of Chinese Society of Power Engineering
关键词
直接空冷凝汽器
空冷单元
风机出口
导流板
流动特性
传热特性
数值模拟
direct air-cooled condenser
air-cooled unit
fan outlet
guide plate
flow field
heat-transfer characteristic
numerical simulation
