关键词：
轻小型喷灌机组;压力差;灌水均匀系数;分布均匀系数;摇臂式喷头
摘 要：
轻小型喷灌机组实际应用时由于地势变化、水力损失等因素影响相邻喷头间会存在一定的工作压力差,影响组合喷灌均匀性.故选取灌水均匀系数Cu和分布均匀系数Du作为评价指标,研究喷头工作压力与相邻喷头工作压力差对喷灌均匀性的影响规律.以摇臂式喷头10PY为例,通过试验分析当喷头工作压力取3个水平(0.22、0.25、0.28 MPa)、相邻喷头喷灌工作压力差取5个水平(0、0.01、0.02、0.03、0.04 MPa)时的喷灌均匀性及水量分布.结果表明,相邻喷头间工作压力差对喷灌均匀系数和分布均匀系数的影响会因喷头工作压力等级而异,低压条件这种影响对相邻喷头间工作压力差越敏感; 0.25 MPa下组合喷灌均匀性最稳定;相邻喷头间工作压力差的存在会使灌溉水深高值区向下游移动;分布均匀系数Du更能反映相邻工作压力差对灌溉水量低值区的影响,不同工况下分布均匀系数Du最大偏差为8.2%.上述结论能为轻小型喷灌机的优化配置与运行提供一定的参考.
作 者：
YI Meng;LI Hong;TU Qin;ZHANG Kai;ZHANG Qian-kun;National Research Center of Pumps,Jiangsu University;School of Intelligent Equipment Changzhou College of Information Technology;
关键词：
small-scale sprinkler irrigation systems;;pressure difference;;irrigation uniformity coefficient;;distribution uniformity coefficient;;whirl sprinkler
摘 要：
In the practical application of small-scale sprinkler irrigation systems,there will be working pressure difference between adjacent sprinklers due to various terrain conditions and the hydraulic loss along the pipeline. In order to study the influence of pressure difference on the irrigation uniformity,two indicators including the irrigation uniformity coefficient Cuand the distribution uniformity coefficient Du are applied. The impact sprinkler typed 10 PY is used,and the water distribution and irrigation uniformity are tested under the working pressures( 0.22,0.25,0.28 MPa) and five groups of pressure differences( 0,0.01,0.02,0.03,0.04 MPa). The results indicate that the influence of working pressure difference between adjacent sprinklers on the irrigation uniformity coefficient Cu and the distribution uniformity coefficient Duvaries considering different working pressures. The irrigation uniformity under lower working pressures is more sensitive to the change of pressure difference between adjacent sprinklers; the irrigation uniformity at the working pressure 0.25 MPa is the most stable. Higher pressure difference between adjacent sprinklers will lead to the move of areas of higher irrigation depth to the downstream of the pipeline. The distribution uniformity coefficient Duis more suitable to indicate the effect of pressure difference between adjacent sprinklers on the areas with lower irrigation depth. The highest difference between the distribution uniformity coefficients under different working conditions is 8. 2%.These may provide a certain reference for the configuration optimization of small-scale sprinkler irrigation machines.
