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Abstract
An intermittent water dispersion device disperses the water outflow from the nozzle of a sprinkler discontinuously. The shape, location, and number of the dispersion teeth have significant effects on the hydraulic performance of low-pressure sprinklers. In this study, the shortest spray distance (R) and affected area angle (I±) were chosen as indexes of the effect on the sprinkler‘s hydraulic performance caused by dispersion teeth, and a method to calculate R was established. An orthogonal experiment was carried out for sprinklers having the following parameters: tooth width (a), insertion depth of tooth into the water jet (h), and distance from the outlet nozzle to the tooth (c). The optimum sprinkler performance was obtained with a = 1.6 mm, h = -1 mm, and c = 4 mm (test 1) and with a = 1.6 mm, h = 0 mm, and c = 9 mm (test 4). Dynamic water distribution curves for different tooth parameters were obtained by rotationally adding the static radial water distribution curves using MATLAB. The results show that the calculated values agreed well with the experimental values. The lowest working pressure was 230 kPa for nine teeth in test 1 and 180 kPa for eleven teeth in test 1, which means that uniform low-pressure irrigation can be implemented by increasing the number of dispersion teeth to compensate for the decrease in uniformity that results from lowering the pressure.
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