表面式间接空冷塔内外流场的数值分析

Numerical Research on the Inside & Outside Flow Field of Surface Indirect Air Cooled Radiators

为了研究侧风对表面式凝汽器的自然通风间接空冷系统受的影响,借助FLUET模拟软件平台,应用合理的模型,对间接空冷塔分别在5 m/s和10 m/s不同的风速下进行模拟。计算结果表明,当风速为5 m/s时,塔内换热较为良好,塔内左右侧压力分布比较均匀。当风速增加到10 m/s时,产生了明显的回流,热空气离开塔的上升速度降低,塔内抽力明显降低。因此对空冷塔的换热造成了影响。数值模拟结果可作为间接空冷塔的优化设计的依据。

To study the influence of the side-wind on the natural draft indirect air cooling system of the surface condenser, this article simulates the states of the surface air cooled radiator at the wind speed of 5 m/s and 10 m/s in one power plant by utilizing FLUET emulation software and applying a reasonable model. The result shows that at the wind speed of 5 m/s, the heat transfer in the radiator is in good condition and the lateral pressure in it is even. The result also shows that when the wind speed increases to 10 m/s, obvious re-circulation is generated, the rising speed of heated air escaping from the tower slowed down and the draught in the tower dramatically decreasing. Therefore this condition affects heat exchanging of the air cooled radiator. The results of numerical simulation can be used as the basis for optimization design of the air cooled radiator.