排灌机械工程学报2016，Vol.34Issue(5)：449-454,6.DOI:10.3969/j.issn.1674-8530.16.0026
低压喷头喷嘴优化设计及内部流场数值模拟
Optimization design of nozzle and numerical simulation of internal flow field in low-pressure sprinkler
摘要
Abstract
In view of poor sprayiag uniformity and short range in low-pressure sprinklers,various spe-cial-shaped nozzles are designed based on the principle of identical cross-sectional area.ANASY CFX is applied to simulate three -dimensional internal flow field in these sprinklers.The numerical simulation results are validated by using the measured performance parameters of low-pressure sprin-klers,including range,water distribution and drop diameter.The simulated results show that the re-gion occupied by high velocity at the outlet of inverted U shaped nozzle is the largest and the velocity profile keeps consistent with the increasing working pressure,showing a good advantage in extending the range and improving the spraying uniformity.The experimental results show that the range of in-verted U shaped nozzle is about 1 .110 times than that of the circular nozzle,which is basically around 2% lower than the prediction.At a 300 kPa working pressure,the drop diameter generated by the in-verted U shaped nozzle is 4.21 mm as the minimum,showing the best atomization performance.The wa-ter distribution in that nozzle is approximately triangular,all the uniformity coefficients are more than 82%.With increasing distance,the water through the circular and rounded rectangular nozzles rises first,and then decreases,and all the uniformity coefficients are lower than that of the inverted U shaped nozzle.In conclusion,the hydraulic performance of the inverted U shaped nozzle is much better in com-parison with the others,particularly,the range is increased on the basis of uniformity improved.关键词
低压喷头/异形喷嘴/优化设计/数值模拟/水力性能Key words
low-pressure sprinkler/special-shaped nozzle/optimization design/numerical simulation/hydraulic performance分类
农业科技引用本文复制引用
张前,袁寿其,刘俊萍,鲍亚..低压喷头喷嘴优化设计及内部流场数值模拟[J].排灌机械工程学报,2016,34(5):449-454,6.基金项目
国家自然科学基金资助项目(51309117) （51309117）
国家863计划项目(2011AA100506) （2011AA100506）
江苏高校优势学科建设工程项目 （）
