Design Parameters of Double Rectangular Nozzles with Impact Sprinkler

Abstract

For a double rectangular nozzle, the inside contracting angle, length-to-width ratio of the rectangular slot, and spacing between two rectangular slots are its main three design parameters. Water distribution profiles and droplet diameters for nozzles having different design parameters were tested. It was found that water distribution and droplet diameter are highly sensitive to both the spacing between two rectangular slots and the length-to-width ratio of the slot; however, the hydraulic performance of a double rectangular nozzle appears to be independent of the inside contracting angle. The effect of the diffuse extent of jets formed by double rectangular nozzles on the sprinkler rotation speed was also investigated, and it was found that the speed decreases as the diffuse extent of the jet increases, and either a large slot spacing or a small length-to-width ratio may lead to a low rotation speed.