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.