OPERATING PRESSURE AND NOZZLE DIAMETER IMPACTS ON THE PERFORMANCE OF SOLID-SET SPRINKLER SYSTEMSA. Derbala
The present study was carried out to investigate the operating pressure and the nozzle diameter impacts on the performance of solid-set sprinkler systems. The tests were performed to investigate the variations among different parameters and numbers of relations were obtained to hold among different assessment indices. The precipitation rate, distribution uniformity (DU), Christiansens coefficient of uniformity (CCU) and the application efficiency of low quarter (AELQ) were performed with three replications using different operating pressures and nozzle diameters. Four operating pressure levels and four nozzle diameters were used in the evaluation process. The results showed that increasing operating pressure from 160 to 250 kPa increased discharge rate at all nozzle diameters. Precipitation rate increased with increasing both operating pressure and nozzle diameter. The distribution uniformity increased by increasing the operating pressure at 4.2 and 5.2 mm nozzle diameter and decreased at 3 and 3.5 mm nozzle diameter. The Christiansens coefficient of uniformity decreased by increasing the operating pressure and it increased with increasing nozzle diameter. Increasing the operating pressure over 180 kPa produced less application efficiency of low quarter which may have been a result of small droplets. The results indicated that optimum operating conditions can achieve higher water distribution uniformity and other operating parameters should be considered when designing sprinkler irrigation systems.
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