主导风向对直接空冷凝汽器换热效率的影响  

Influence of Prevailing Wind Direction on Heat Transfer Efficiency of Direct Air-cooled Condensers

作　　者：周兰欣[1] 崔皓程[1] 仲博学[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,保定071003

出　　处：《动力工程》2010年第2期138-142,共5页Power Engineering

摘　　要：采用SIMPLE算法和k-ε模型,对2台600 MW直接空冷机组的空冷岛外部流场进行了数值模拟,分析了不同主导风向对空冷岛外部流场及空冷凝汽器换热效率的影响,探索了机组换热效率最高及最低时主导风向的范围.结果表明：在同一主导风向下,风速越大,换热效率越低,当风速从3 m/s增大到9 m/s时,换热效率降低了14.3%;在相同风速条件下,当主导风向与空冷平台夹角成135°~150°或者30°~45°时,空冷凝汽器的换热效率最高,当风向角在270°附近时,效率最低,两者效率之差达8.7%.With SIMPLE algorithm and κ-ε model,numerical simulation was performed on external flow field outside cooling island of 2×600 MW direct air-cooled condensers,while influence of prevailing wind direction on both the external flow field and the heat transfer efficiency of condenser analyzed as well as relevant wind direction ranges corresponding to maximum and minimum point of heat transfer efficiency explored.Results show that when the prevailing wind direction is fixed,the larger the wind speed,the lower the heat transfer efficiency will be,and a 14.3% efficiency drop will be resulted if the wind speed rises from 3 m/s to 9 m/s;whereas when the wind speed is constant,the highest heat transfer efficiency will appear in the angle ranges of 135°-150° and 30°-45° between the prevailing wind direction and the air cooling platform,while the lowest efficiency occur around 270°.Difference between the highest and lowest efficiency may get up to 8.7%.

关 键 词：直接空冷凝汽器 主导风向 流场 换热效率 数值模拟 

分 类 号：TK264.11[动力工程及工程热物理—动力机械及工程]