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| DOI：10.13522/j.cnki.ggps.2019047 |
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| Dynamic Simulation and Test of Water Distribution of Fluidic Sprinkler |
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ZHU Xingye1, 2, SHI Yongjie2*, HU Guang2, LIU Junping2
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1. Farmland Irrigation Research Institute, CAAS/Key Laboratory of Water-saving Agriculture of Henan Province, Xinxiang 453002, China; 2. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
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| Abstract: |
| 【Background】Sprinkling irrigation is an irrigation method that uses special equipment to spray pressure water into the air to form tiny water droplets, similar to natural precipitation, and evenly fall on the field. Sprinkler irrigation can control crop water consumption and prevent the radial and infiltration of water loss. The hydraulic performance of uniformity is an important index to measure the quality of sprinkler irrigation. It is also an important parameter in the planning and design of sprinkler system. 【Objective】This paper aims to present the influence of working pressure, nozzle combination spacing, combination mode and rotation speed on uniformity coefficient (CU) and distribution uniformity coefficient (DU) of sprinkler nozzle and multi-nozzle combination. In the actual sprinkler irrigation operation, surface runoff caused by excessive water peaks should be avoided.【Method】The dynamic simulation code of the distribution of sprinkler water in the combination of single sprinkler head and multiple sprinkler heads under different working conditions was used to test the hydraulic performance of jet sprinkler heads. The influence of different working pressure and installation height on sprinkler irrigation intensity and water distribution was studied. The regression relationship between peak water intensity and working pressure is established. The spatial water distribution of a single sprinkler under square and triangle combined sprinkler irrigation is simulated. 【Result】Under the pressure of 100~300 kPa at the installation height of 1.5 m, the peak water volume was concentrated around 5 mm/h, and the standard deviation (STD) was 0.23. The nozzle works under the pressure of 100 kPa, and the peak intensity of water volume at theinstallation height of 1.1 m and 1.3 m can be as high as 8.9 m and 10.5 mm/h, respectively. DU and CU standard deviations of single sprinkler irrigation under different working pressures were 15.5% and 9.3%, respectively, and DU was more sensitive to pressure changes. 【Conclusion】The frictional force of the rotating contact parts of the jet sprinkler in the quadrants Ⅰ and Ⅳ is relatively large, which has caused the concentration of the sprinkler irrigation water distribution in this area. Under different working pressures, the uniformity coefficient CU of a single sprinkler distribution changes more significantly than the uniformity coefficient DU of sprinkler irrigation, and DU and CU have a negative correlation. Sprinkler intensity and peak water volume are related to the installation height and working pressure of the sprinkler. As the installation height increases and the working pressure increases, the more water droplets are broken in the air, the more evenly the sprinkler intensity is distributed in the radial direction. In the actual sprinkler irrigation project, the spacing between square combined sprinkler irrigation should be less than 8 m, and the spacing between triangular combined sprinkler should be arranged around 8 m. At a certain distance from the spraying end of the sprinkler, the intensity of the sprinkler irrigation drops sharply, which is conducive to improve the uniformity of the water distribution of the sprinkler combination spraying and irrigation. In this case, the sprinkler irrigation uniformity is the highest, and the coverage of a single sprinkler irrigation device is the widest, the cost being the lowest. |
| Key words: fluidic sprinkler; meshing; rotation deviation; dynamic simulation; hydraulic performance |
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