Sprinkler performance as affected by nozzle inner contraction angle |
| |
| Authors: | Jiusheng Li Hiroshi Kawano |
| |
| Institution: | (1) Agrometeorology Institute, Chinese Academy of Agricultural Sciences, 30 Baishiqiao Road, Beijing 100081, China Fax: +86-10-6217-4142, CN;(2) Faculty of Agriculture, Kagawa University, Japan, JP |
| |
| Abstract: | The discharge-pressure relationship for the orifice nozzle is essential for developing new sprinkler prototypes and designing
sprinkler irrigation systems. In this work, the sprinkler nozzle inner contraction angle was varied from 20° to 90° to establish
the relationship between discharge and pressure. The sprinkler nozzle discharge increases exponentially with increasing pressure.
The discharge exponent is essentially independent of the nozzle contraction angle and can be taken as 0.5, while the discharge
coefficient decreases significantly with increasing contraction angle. Sprinkler rotation speeds measured for different contraction
angle nozzles decreased as the angle increased. Water distributions were tested indoors for various contraction angles. Sprinkler
nozzles with contraction angles ranging from 20° to 60° produced approximately equal pattern radii and similar water application
profiles, but the pattern radius was significantly reduced for contraction angles above 60°. The optimum inner contraction
angle is about 30°.
Received: 11 July 1997 |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
