Sprinkler performance as affected by nozzle inner contraction angle

文献类型： 外文期刊

第一作者： Li, JS

作者： Li, JS;Kawano, H

作者机构：

期刊名称：IRRIGATION SCIENCE （ 影响因子：2.94； 五年影响因子：3.214 ）

ISSN： 0342-7188

年卷期： 1998 年 18 卷 2 期

页码：

收录情况： SCI

摘要： 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 degrees to 90 degrees 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 degrees to 60 degrees produced approximately equal pattern radii and similar water application profiles, but the pattern radius was significantly reduced for contraction angles above 60 degrees. The optimum inner contraction angle is about 30 degrees.

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