高位塔U型收水装置有/无水工况下阻力特性实验研究

Experimental study on resistance characteristics of water collecting devices with U-type channel under dry/wet condition in high-level water collecting cooling towers

随着高位收水冷却塔的快速发展,为了更好地优化塔内流场,提高冷却塔的冷却效率,对高位塔中收水装置阻力特性的研究愈加必要。本文针对实验工况设计了风洞实验装置,对一种典型的U型收水装置在风洞中进行了模型实验。在不同空气流速下,研究对比了有/无水工况下收水装置的阻力特性,发现有水工况阻力明显大于无水工况的阻力。随后,利用数值模拟研究了空气流场,并分别提出了有/无水工况下阻力系数与雷诺数的关系。最后,对有水工况下的阻力系数计算公式进行了修正,使其能够为实际高位塔的阻力计算提供依据。

With the rapid development of high-level water collecting cooling towers,in order to better optimize the flow field inside the tower and improve the cooling efficiency of the cooling tower,it is necessary to study the resistance characteristics of the water collecting device in the high-level tower.In this paper,a wind tunnel experimental apparatus was designed according to the test conditions,and the model experiments of typical U-type water collecting devices were carried in the wind tunnel.The resistance characteristics of the water collecting device was investigated at different air velocities under dry/wet conditions.It is found that the resistance under wet condition is significantly greater than that under dry condition.Then,the air field is studied by simulation,and the relationship between resistance coefficient and Reynolds number under dry/wet conditions is proposed.Finally,the formula of resistance coefficient under wet condition is modified to provide basis for calculating the resistance of high-level water collecting cooling towers.