变量喷洒全射流喷头副喷嘴优化与评价

为解决全射流喷头实现变量喷洒时由于压力变化而产生的水量分布不均匀问题，以20PXH型变量喷洒全射流喷头为研究对象，设计不同副喷嘴改善水量分布。通过射流理论分析设计了8种副喷嘴方案，测量了喷头径向水量分布，采用不同压力下喷灌强度差值分析的方法，得到方案5挡板式副喷嘴结构改善水量情况最好。通过测量不同挡板角度及不同压力下水量分布，以均匀性系数值最大为目标，以挡板角度及均匀性取值范围为约束条件，首次建立了变量喷洒全射流喷头喷洒均匀性的综合评价函数，并求导得到最佳挡板角度为21.2°。

Evaluation and Optimization of Variable Rate Complete Fluidic Sprinkler Vice Nozzle

According to the fact that water distribution of variable rate complete fluidic sprinkler is not uniformity under different pressures, 20PXH variable rates complete sprinkler was taken as the research model, and eight different schemes of vice nozzles were designed and analyzed by jet water theory. The water distribution was measured. The method of analyzing the test data by different sprinkler irrigation intensities under different pressures was applied, and the best scheme was obtained. The test for water distribution under different pressures and baffle angles was carried out. Taking maximal uniformity coefficient as the function objective, and the range of baffle angle and uniformity coefficient as the constraint conditions, the comprehensive evaluation function of variable rates of the complete sprinkler uniformity was created for the first time. The optimum baffle angle is 21.2° by derivative the function.