摘要
为解决丘陵地区固定式喷灌系统因地形起伏、远距离输送造成的喷头进口压力差异较大等问题,设计了一种适用于丘陵地区固定式喷灌系统的压力调节装置,主要通过弹性膜片形变及侧流道改变过流截面积,达到稳定喷灌压力及调节喷灌流量的目的.通过数值模拟获得了压力调节装置内部流场分布及变化规律.以弹性膜片厚度、补偿腔高度、流道挡板角度、副流道高度及副流道角度为关键结构参数,以未起调阶段性能曲线斜率、预置压力及流态指数为评价指标,分别进行单因素试验和正交试验,获得压力调节装置关键结构参数及其交互作用对压力调节装置性能的影响规律.结果表明:弹性膜片厚度、副流道高度及流道挡板角度对压力调节装置性能影响较为显著,通过灰色关联度计算方法获得压力调节装置最优结构参数组合,其中弹性膜片厚度为1 mm,补偿腔高度为6 mm,流道挡板角度为80°,副流道高度为5 mm,副流道角度为45°;压力调节性能参数中流态指数为0.3152,预置压力为225 kPa,未起调阶段性能曲线斜率为0.580.
In order to solve the problem of large pressure difference at the sprinkler inlet of fixed sprinkler irrigation systems in hilly areas due to the influence of terrain fluctuation and long-distance transportation,a new type of pressure-regulating device suitable for fixed sprinkler irrigation systems in hilly areas was designed,mainly through the deformation of the elastic diaphragm,and the side flow channel changing the flow cross-sectional area to achieve the purpose of stabilizing the sprinkler irrigation pressure as well as adjusting the sprinkler irrigation flow rate.Numerical simulation was used to explore the distribution and variation law of the internal flow field of the pressure-regulating device.With the thickness of the elastic diaphragm,height of the compensation cavity,angle of the flow channel baffle,height and angle of the secondary flow channel as key structural parameters,and the slope of the performance curve,preset pressure and flow state index as evaluation indexes,single factor tests and orthogonal tests were designed to respectively analyze the influence of these five key structural parameters and their interaction on the hydraulic performance of the pressure-regulating device.The results show that the thickness of the elastic diaphragm,the height of the secondary flow channel,and the angle of the flow channel baffle have a significant impact on the hydraulic performance of the pressure-regulating device.The optimal structural parameter combination of the pressure-regulating device obtained by the grey correlation calculation method is that thickness of the elastic diaphragm is 1 mm,height of the compensation cavity is 6 mm,angle of the flow channel baffle is 80°,height of the secondary flow channel is 5 mm,and the angle of the secondary flow channel is 45°.The obtained pressure-regulating performance parameters are that flow state index is 0.3152,preset pressure is 225 kPa,and the slope of the performance curve during the unregulated stage is 0.580.
作者
赵余霞
刘俊萍
赵艳艳
朱兴业
ZHAO Yuxia;LIU Junping;ZHAO Yanyan;ZHU Xingye(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China)
出处
《排灌机械工程学报》
北大核心
2025年第6期635-641,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(52279036)
江苏省重点研发计划项目(BE2021341)
江苏大学农装学部项目(NZXB20210101)。
关键词
压力调节
数值模拟
正交试验设计
喷洒均匀性
pressure-regulating
numerical simulation
orthogonal tests design
water distribution uniformity
