%A ZHOU Xiaoyin, LI Hong, JIANG Yueª¤
%T Study on water distribution uniformity of non-circular nozzles at low pressure
%0 Journal Article
%D 2017
%J Journal of Drainage and Irrigation Machinery Engin
%R 10.3969/j.issn.1674-8530.16.0158
%P 448-453
%V 35
%N 5
%U {http://zzs.ujs.edu.cn/pgjx/CN/abstract/article_2234.shtml}
%8 2017-05-25
%X According to the principle of equal nozzle cross-section area, a few nozzles with different shapes were designed to study their effect on the distribution of sprinkler irrigation at low pressure. The nozzle hydraulic performances were measured, the spraying uniformity of different nozzles were analyzed by using Matlab software. Additionally, the spatial flow pattern with different nozzles were observed with high speed photographical technique. The results show that the flow rate decreases gradually with increasing nozzle cone angle at the same pressure, the flow rate through the squared cross-section nozzle is the largest, that through the triangular cross-section nozzle is the smallest. The nozzle wetted radius firstly increases then decreases with increasing cone angle, and the circular and triangular cross-section nozzles are subject to the longest and shortest wetted radius, respectively. Based on high-speed photographical images, it can be seen that the jet breaking length issued from the triangular cross-section nozzle is the shortest, while the breaking length from the circular cross-section nozzle is the longest. With increasing nozzle cone angle, three nozzle jet breaking lengths show a decreasing trend. Composting the nozzle wetted radius and the atomization effect, it can be known that the circular cross-section nozzle with 45 degrees cone angle is the best. Moreover, it is found that the combined water distribution uniformity coefficient of the non-circular cross-section nozzles is evidently better than the circular nozzle based on measurements.ª¤