Veejet80150喷头特性及其在降雨机中的应用

由于人工模拟降雨可以解决天然降雨耗时长、成本高以及难以取得精准控制数据等问题,越来越多的学者使用该方法进行科学研究。通过降雨量测量和计算分析方法,测定了Veejet80150喷头降雨特征参数,评价了改进后槽式下喷模拟降雨机的降雨均匀性。结果表明:Veejet80150喷头降雨面积为矩形,且随喷头高度增加而增加,中心点降雨强度随高度增加而减小,并从中心点向外呈规律性减小,便于多喷头组合,获得空间均匀降雨。多喷头组合降雨时,2.5 m高度下的降雨均匀系数在0.88~0.90范围内;4 m高度下的降雨均匀系数在0.94~0.95范围内,该降雨机均匀性好,喷头高度大于2.5 m时可满足试验要求。

Characteristics of Veejet80150 Nozzle and Its Application in Rainfall Simulator

The observation of natural rainfall is time-consuming,cost and laboring,artificial rainfall simulation can solve these problems.By measuring,calculating and analyzing rainfall,the rainfall characteristic parameters of Veejet80150 were determined,and the uniformity of the improved trough rainfall simulator was evaluated.The results show that:The rainfall area of Veejet80150 nozzle is rectangular.As the height increase,the rainfall area increase,and the rainfall intensity at the central point decreases.The rainfall intensity of single nozzle decreases regularly from the central point outward,so as to facilitate the combination of multiple nozzles and obtain uniform rainfall in the space.In the case of multiple nozzles combination,the uniformity coefficient of the rainfall simulator at the height of 2.5 m is within the range of 0.88~0.90,and at the height of 4 m is within the range of 0.94~0.95.The rainfall simulator has good uniformity and can meet the best requirements when the nozzle height is great than 2.5 m.