Orthogonal test of important parameters affecting hydraulic performance of negative pressure feedback jet sprinkler
YAO Jicheng1, WANG Xinkun1*, ZHANG Shaochuang2, XU Shengrong1, JIN Binbin1, DING Shiwei3
1. National research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. PowerChina Guizhou Electric Power Engineering Co. Ltd., Guiyang, Guizhou 550008, China; 3. Shandong Taishan Pumped Storage Power Station Co. Ltd., Taian, Shandong 271000, China
Abstract：In order to explore the effect of important parameters of the negative pressure feedback jet nozzle on the hydraulic performance. The important parameter combination under the optimal comprehensive hydraulic performance was selected. Firstly, 4-factors and 3-levels orthogonal test were designed. According to the experimental requirement, three kinds of nozzles with lengths of 4.2, 5.6, and 7.0 cm, and three kinds of nozzles with diameters of 3, 4, and 5 mm were manufactured. The jet inlet width × depth is 4 mm × 8 mm, position difference is 1.80 mm, sidewall angle 20° split with a distance of 28.0 mm and jet elevation angles of 20°, 30°, and 40° was used for hydraulic performance testing. The comprehensive scoring method and range analysis method were used to process the orthogonal test results, and the range and sprinkler irrigation uniformity coefficient were introduced to evaluate the test results. The results show that the important parameters that affect the comprehensive hydraulic performance of the sprinkler are spray elevation angle, diameter of main and auxiliary sprinklers, working pressure, length of main and auxiliary sprinkler in descending order. The optimal combination of important parameters under this jet mechanism is obtained as follows: working pressure is 0.35 MPa, main × auxiliary sprinkler diameter is 5 mm×4 mm, spray elevation angle is 30°, and main × auxiliary sprinkler length is 4.2 cm×4.2 cm. The test results can provide theoretical data support for the commercialization and future engineering applications of this type of domestic sprinklers
