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| Experimental study on influence of flow channel structure on hydraulic performance of low-pressure rotary sprinkler |
| LIU Junping*,LI Tao, ZHANG Qian |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In this study, a low-pressure rotary sprinkler was taken as the study object and the geometrical parameters of channel in the sprinkler head were chosen as the experimental factors, including the shape of outlet section, deflection angle of flow channel, were length of passage shape and elevation angle of outlet. An orthogonal array of four factors and three levels was selected to carry out the experiment, measuring the water distribution and flow rate of each sprinkler under the working pressure of 250 kPa, and the range of sprinkler was calculated by the linear interpolation method, the uniformity coefficient was simulated by Matlab under the square arrangement, the influence of geometrical parameters on the hydraulic performance of sprinkler was analyzed. The results show that the spraying uniformity of low-pressure rotary sprinkler which the shape of outlet is circular or inverted U is superior to that of irregular outlet. There is little water of irregular outlet near the sprinkler, mostly concentrating in the center, resulting more water accumulation in the overlapping region of combined sprinkler irrigation. No influence of geometrical parameters change in the flow channel has on the flow rate, and its fluctuation ranges between -0.1 and 0.1 m3/h. The graduations of geometrical parameters which affect the range and spraying uniformity of low-pressure rotary sprinkler were achieved after the orthogonal experiment, which were deflection angle of flow channel, shape of outlet section, elevation angle of outlet and arc length of passage shape. The best geometrical parameters of low-pressure rotary sprinkler were summarized, that is the shape of outlet is circular, deflection angle of flow channel is 4.5°, arc length of passage shape is 29 mm and elevation angle of outlet is 25°.
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Received: 27 September 2019
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