According to the actual size of cooling tube bundle and the arrangement of cooling triangle of a surface condenser aluminum exchangers(SCAL)natural draft cooling tower

the geometric 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 carried 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 gradually

while that at crosswind side and lee side decreases and tends to be obvious;the tower ventilation rate and outlet air speed increases at first and then decreases

and their maximum values appear when the wind speed is 2m/s.