| Cite this article: | 华琳,李红,蒋跃,等.方形喷嘴的中低压喷洒水滴性能试验研究[J].灌溉排水学报,0,():-. |
| Hua Lin,Li Hong,Jiang Yue,et al.方形喷嘴的中低压喷洒水滴性能试验研究[J].灌溉排水学报,0,():-. |
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| Experimental study on hydraulic performance of droplets injected from square nozzles under low-intermediate pressure |
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Hua Lin, Li Hong, Jiang Yue, Qin Longtan
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Research Center of Fluid Machinery Engineering and Technology
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| Abstract: |
| 【Objective】 In order to study the effects of orifice shape and impact arm of the sprinkler nozzle on the spraying characteristics,【Method】the parameters of water droplets were measured by 2D-Video-Distrometer. Taking the circular nozzle as the control object, the effects of the orifice shape on the sprinkler hydraulic properties such as water droplets diameter, water application rate and kinetic energy intensity under low-medium pressure were analyzed. The effects of the impact arm on improving the spraying performance of the square nozzle were also researched. 【Result】Results shown that the spraying characteristics of square nozzle and circular nozzle are similar under low-intermediate pressure conditions. The improvement effect of the orifice shape on the water distribution is not significant, and the precipitation is mainly concentrated at 73% of the range. Near the sprinkler, the diameter and kinetic energy of the water droplets which produced by the square nozzle are larger than that of the circular nozzle. Combining the square orifice with the auxiliary water dispersing structure such as the impact arm can enhance the dispersion of the water jet and reduce the droplets kinetic energy at the end of the wetness radius. 【Conclusion】 Therefore, the dispersion structure can be combined with the square nozzles to overcome the disadvantages of large diameter and kinetic energy of water droplets, to reduce the damage of droplets to the soil and crops, and retain the good hydraulic performance of the sprinkler. This research has reference value for the nozzle structure design of low-intermediate pressure sprinkler irrigation system. |
| Key words: square nozzle; low-intermediate pressure sprinkler irrigation; hydraulic performance; droplets diameter; kinetic energy intensity |
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