Structure design and hydraulic performance test of water and pesticide integrated sprinkler

A new water-pesticide integrated sprinkler was designed by applying water medicine integrated technology to sprinkler irrigation system. An orthogonal array with five factors and four levels was selected to carry out the experiments, and the optimum values of structure parameters were confirmed after the experiments. The influence of the sprinkler structure on hydraulic performance, mainly include the flow rate, the range, the spraying net height and uniformity coefficient, under two operating pressures of 150 kPa and 350 kPa were analyzed. Then, the best structure combination of water medicine integrated nozzle was obtained. The results show that under the same conditions, increasing of sprinkler outlet diameter can effectively improve the sprinkler flow rate and uniformity coefficient. Under the same sprinkler outlet diameter, the spraying net height is increased with the increase of flow rate. The structures of the outlet holes and beveled grooves can effectively affect the hydraulic performance of the sprinkler. The influencing factors in decreasing order of importance for hydraulic performance are the sprinkler diameter, the outlet holes diameter, the bevelled grooves number, the bevelled grooves width, the outlet holes number. The optimum structural parameters of the sprinkler are the sprinklers diameter of 3.0 mm, three outlet holes, 2.0 mm of the outlet holes diameter, three be-velled grooves, 0.8 mm of the bevelled grooves width. The results provide certain important theoretical data for the design and development of the sprinkler and its engineering application.