The circumferential unevenness at air outlet of evaporative cooling equipment was studied with an efficient water collection trough.To overcome the deficiency of single-layer filter paper method,a three-layer fan-shaped filter paper method was proposed,and subsequently experimental tests were conducted respectively by the method of efficient water collection trough,single-layer filter paper and three-layer fan-shaped filter paper,following which,their measurement precisions were compared.Results show that the precision of drifting measurement can be improved by adding circumferential testing points,or even by continuous rotation along the fan centerline.Three-layer fan-shaped filer paper helps to reduce the absorption weight and secondary drift loss.The drift loss mainly concentrates in the direction along the outlet radius from 0.71R to 0.75R.%采用高效收水槽法研究了蒸发冷却设备出风口飘水的周向不均匀性,基于单层滤纸法存在的缺陷,设计了一种三层扇形滤纸装置,通过实验比较了高效收水槽法、单层滤纸法和三层扇形滤纸法3种测试方法的飘水率.结果表明:增加周向测试位置甚至以风筒中心线为轴采用连续旋转的测试方法,有助于提高测量的精确度;三层扇形滤纸法有效消除了湿汽增重和二次飘水量;飘水主要集中在沿出风口径向0.71R～0.75R内.
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