EFFECTS OF DOUBLE-RECTANGULAR-SLOT DESIGN ON IMPACT SPRINKLER NOZZLE PERFORMANCE

Some of the main design parameters for double rectangular nozzles are the inside contraction angle, the length-to-width ratio of the rectang ular slot, the spacing between two slots, and the angle between the tw o adjacent slots. The inside contraction angle and slot dimensions and spacing were varied and water application patterns and droplet diamet ers at the end of the spray stream were evaluated. Pattern radius decr eased as slot spacing increased and increased as the length-to-width r atio increased. Sprinkler pattern and droplet diameter were insensitiv e to the inside contraction angle, The nozzle discharge coefficient wa s independent of all investigated parameters. Sprinkler rotation speed decreased with slot spacing but increased with the length-to-width ra tio.