SCAL型间接空冷塔内外流场数值模拟

摘要

根据某SCAL型自然通风空气冷却塔(空冷塔)散热管束的实际尺寸和冷却三角的布置方式，对塔底换热单元建立了几何模型，并基于 RNG k-ε紊流模型和多孔介质模型，对塔内外流场进行了三维数值模拟，探究了环境条件对其运行特性的影响。研究结果表明：随着环境风速的增加，空冷塔迎风面进口风速逐渐增加，而侧风面和背风面的进口风速则呈下降趋势，且该趋势随温度的上升愈加明显；空冷塔的通风量和塔出口速度随环境风速的增加先增大后减小，且在风速为2m/s 时，其通风量和出口速度最大。%According to the actual size of cooling tube bundle and the arrangement of cooling trian-gle of a surface condenser aluminum exchangers (SCAL)natural draft cooling tower,the geomet-ric model of heat transfer elements at the tower bottom was established.On the basis of the RNG k-εturbulence model and porous medium model,three-dimensional numerical simulation was car-ried out for the inner and external flow field of the air cooling tower,to investigate the influence of environmental conditions on the tower's operation performance.The results show that,with an increase in ambient wind speed,the inlet air speed at windward side of the tower increases gradu-ally,while that at crosswind side and lee side decreases and tends to be obvious;the tower ventila-tion rate and outlet air speed increases at first and then decreases,and their maximum values ap-pear when the wind speed is 2 m/s.