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鼓风式机械通风冷却塔常用于核电厂的重要厂用水系统,但目前的相关设计规范并没有给出冷却塔的空气动力特性计算公式。该文采用Fluent软件对鼓风式机械通风冷却塔的空气动力进行了数值模拟计算,对冷却塔的设计布置进行了优化,分析总结给出了冷却塔阻力计算公式。结果表明:填料安装高度对鼓风式机械通风冷却塔整塔阻力影响不大,但会影响填料断面风速分布均匀性,填料安装高度越低,风速分布越均匀;出口收缩段的高度越高,整塔阻力越小,风速分布越均匀;出口收缩段与水平的夹角越大,整塔阻力系数越小,但变化趋势不明显,收缩角基本不影响填料断面风速分布均匀性。
Blast-type mechanical ventilation cooling towers are commonly used in nuclear power plant important plant water systems, but the current design code does not give the cooling tower aerodynamic formula. This paper uses Fluent software to simulate the aerodynamic performance of the blower mechanical ventilation cooling tower, and optimizes the design and layout of the cooling tower. The calculation formula of the cooling tower resistance is given. The results show that the packing installation height has little effect on the whole tower resistance of the blower type mechanical ventilation cooling tower, but it will affect the uniformity of the wind speed distribution on the section of the packing. The lower the packing installation height, the more uniform the wind speed distribution. The higher the outlet contraction section height, The smaller the resistance of the whole tower, the more uniform the wind speed distribution. The larger the included angle between the outlet contraction section and the horizontal, the smaller the resistance coefficient of the whole tower, but the change trend is not obvious. The shrinkage angle basically does not affect the uniformity of the wind speed distribution on the section of the filler.