| Through using numerical simulation software FLUENT, research on natural draft wet cooling tower (NDWCT) of 1000MW power unit was investigated in this paper. After simulation of air temperature and humidity, the author finds that when the cold and dry ambient air enters the rain zone and flows into the tower, the mismatch between water mass velocity and air mass velocity causes the effect of heat transfer is not good in the center region. Based on the research, it proposes several methods of installing deflector to increase the air velocity and disturbance in center region and strengthen the heat transfer. Under the same conditions, the temperature after optimization decreases about 0.6℃.
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