NUMERICAL ANALYSIS OF AERODYNAMIC FIELD IN WET TYPE NATURAL-DRAFT COOLING TOWER

The numerical analysis of aerodynamic field in wet type natural-draft reverse-flow hyperbolic cooling tower has been carried out,and its numerical simulation being performed by using PHOENICS computing platform.It is believed from results of analysis that: a negative pressure is created in the lower under calm and stable operation state of the cooling tower,the pressure to be gradually enhanced along with increasing the tower height;the flow field in the tower to be axisymmetrically distributed,and the circumferential distribution to be uniform,the central flow velocity to be max.Because the cooling power of the tower is greatly affected by the environment,various off-design conditions,including water-spraying density,ambient temperature,and resistance variation etc.,have been calculated and compared.It was found that the influence of inlet water temperature of the tower to be basically equivalent to that of the water-spraying density upon the flow field in the tower.