侧向风对自然通风直接空冷塔性能影响的数值分析

采用多孔介质简化模型分析了在不同风速情况下300 MW自然通风直接空冷系统空冷塔内的流场和各凝汽器换热量.结果表明:在没有侧向风时,流场是均匀对称的,此时塔内空气流量最大,而各凝汽器换热量均匀;当有侧向风时,由于空冷塔底部气流存在漩涡,使空冷塔内空气回流,空气流量减小;在风速大于4 m/s时,各凝汽器换热量差异较大,随着风速增加,这种现象加剧.

Numerical Analysis of the Influence of Side Wind on the Performance of the Direct Air Cooling Tower with Natural Ventilation

The flow field in the 300MW direct air cooling tower with natural ventilation and the duty of each condenser have been analyzed under different wind velocities based on the model of porous medium.The results have indicated: the flow field is even and symmetric if no side wind.In this case,maximum air flow has been obtained in the cooling tower and the duty in each condenser is homogeneous.Reduced air flow will be obtained if there is side wind in the air cooling tower because there is turbulence at the bottom of the air cooling tower which will make the air in back-flow.The influence will be more obvious on the reduced air flow if the side wind velocity is larger than 4 m/s.There is large difference in the duty of each condenser.The larger the wind velocity is,the more influence is on the condenser.