Application of sprinkler with variable range of spray in sloping land

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.