基于射流脉冲三通的桁架喷灌机水力性能试验

Hydraulic Performance Test of Truss Sprinkler Irrigation Machine Based on Jet Pulse Tee

为了研究安装射流脉冲三通的桁架喷灌机与普通桁架喷灌机水力性能的差异,试验喷灌机搭载4个距地面高度1 m的Nelson D3000型折射式喷头,分别设置100、150、200 kPa 3种进口压力和3.0、3.5、4.0 m 3种喷头组合间距进行全因素组合试验。通过间距500 mm的5列9行雨量筒阵列集水,测试了安装射流脉冲三通喷灌机的定喷、行喷水量分布和安装普通三通的行喷水量分布。结果表明:定喷试验时,在100、150、200 kPa进口压力下,4 m喷头组合间距的克里斯琴森均匀系数Cu与分布均匀性系数Du均最高,分别大于90%和84%;行喷试验时,在100、150、200 kPa进口压力下,脉冲组的水深峰值比对照组分别降低了27.1%、27.9%、28.6%,克里斯琴森均匀系数Cu分别提升了17.1%、12.6%、3%,分布均匀性系数Du分别提升了24.2%、11.2%、9.5%。射流脉冲三通提供的脉冲流能够有效降低桁架喷灌机的峰值喷灌强度并提高水量分布均匀性。

In order to study the difference in hydraulic performance between the truss sprinkler with jet pulse tee and the ordinary truss sprinkler,the experimental sprinkler was equipped with four Nelson D3000 refractive sprinklers mounted 1m above the ground.The working pressures of 100 kPa,150 kPa,and 200 kPa,and nozzle spacings of 3.0 m,3.5 m,and 4.0 m were set up to carry out the all-factor combination test.The water distribution of fixed position spraying and mobile spraying of the jet pulse tee irrigation machine and the water distribution of the line spraying water with the installation of ordinary tee were tested using a five-row,nine-column rain gauge array with a spacing of 500 mm.The results of the experiment are shown below.In the fixed spray test,at inlet pressures of is 100 kPa,150 kPa and 200 kPa,the Christiansen uniformity coefficient and distribution uniformity coefficient of the 4m nozzle combination spacing are the highest,which are greater than 90%and 84%,respectively.In the spraying test,when the inlet pressure of the nozzle was 100 kPa,150 kPa and 200 kPa,the peak water depth of the pulse group was reduced by 27.1%,27.9%and 28.6%,respectively,and the Christiansen uniformity coefficient increased by 17.1%,12.6%and 3%,respectively,and the distribution uniformity coefficient was increased by 24.2%,11.2%and 9.5%,respectively.The pulse flow generated by the jet pulse tee can effectively reduce the peak irrigation intensity of the truss sprinkler and improve the uniformity of the water distribution of the truss sprinkler.