变射程喷头在坡地喷灌中的应用

Application of sprinkler with variable range of spray in sloping land

传统单喷头在坡地上进行喷灌时,水量分布会发生改变。为提高坡地上喷洒均匀性,采用一种压力/流量调节装置与20型全射流喷头结合,使上坡射程增大,下坡射程减小,从而改善坡地上单喷头的水量分布。根据喷头的旋转均匀性满足行业标准要求,平地喷洒形成的射程差符合上、下坡射程差的要求,以及调节装置形成的压力损失不能太大三个约束条件,对调节装置的关键尺寸,调节片基本开孔半径进行了优化,结果表明半径选择3mm合适。坡地上径向水量分布以及射程的试验数据表明,这种变射程喷头适合大约10°坡度的调节,具有改善水量分布的作用,在坡地组合喷灌中具有优势。

When the traditional single sprinkler was used in sloping land, the water distribution would be changed. In order to improve the water distribution uniformity of sloping land,a pressure and flow rate adjusting device was put forward and combined with the PXH20 complete fluidic sprinkler. by using of the new device, the throw radius decreased in down slope direction and increased in upslope direction. According to three constraint conditions of rotating uniformity, the difference of spraying range and the pressure loss, the key dimension of the adjusting device was optimized. The results showed that the sprinkler worked with the best raindrop uniformity when the radius of the overflow orifice on the adjusting disk was 3 mm. The experimental data of the water distribution curve and the throw radius in up and down direction showed that this kind of sprinkler could be applied to approximate 10 degree slope land to improve the raindrop distribution. It has great advantage in the sprinkler combination irrigation on sloping land.