摘要
本文采用物理试验与CFD数值模拟方法研究基于目标流量下膜片最大位移与入口压力之间的相关关系,以及不同膜片厚度下膜片最大位移对出流量的影响。结果表明,目标出流量等程度增加时,出流量越大,所需入口压力范围就越大。膜片厚度越大,同一出流量和膜片最大位移下所需的入口压力越大。膜片厚度值越小,出流量等程度增加时对应的入口压力变化程度越大。膜片厚度越大,三维曲面图的外边线呈现出变化程度逐渐减小的趋势。说明随膜片厚度的增加,在入口压力和出流量等程度增加时,膜片最大位移增加趋势较为平缓。膜片厚度越大,膜片最大位移、入口压力与出流量三者之间形成交线波动就越不明显,膜片厚度越大的三维曲面图的拟合效果越好。压力补偿灌水器的出流量主要受膜片结构参数的影响,通过调节膜片最大位移的不同改变灌水器出水口过水断面面积的大小,以此影响灌水器的出流量。通过对膜片不同结构参数的数值模拟,对得出的出流量进行不同工况下的关系式拟合,为膜片材料的选取提供理论依据和技术规范。
In this paper,physical tests and CFD numerical simulation methods are used to study the correlation between the maximum displacement of the diaphragm and the inlet pressure based on the target flow rate,and the influence of the maximum displacement of the diaphragm on the outlet flow rate under different thickness of the diaphragm.The results show THAT when the degree of target outflow rate increases,the larger the outflow rate is,the larger the required inlet pressure range is.The greater the diaphragm thickness,the greater the inlet pressure required for the same discharge and the maximum displacement of the diaphragm.The smaller the value of diaphragm thickness,the greater the change of inlet pressure when the degree of discharge increases.With the increase of the thickness of the diaphragm,the outer edge of the 3D surface graph shows a trend of decreasing.That is to say,with the increase of diaphragm thickness,when the inlet pressure and discharge rate increase,the maximum displacement of diaphragm increases gently.The larger the thickness of the diaphragm,the less obvious the cross-line fluctuation between the maximum displacement of the diaphragm,the inlet pressure and the discharge,and the better the fitting effect of the three-dimensional surface map with the larger the thickness of the diaphragm.The discharge rate of the pressure compensation emitter is mainly affected by the structural parameters of the diaphragm.The area of the water crossing section at the outlet of the emitter is changed by adjusting the maximum displacement of the diaphragm,so as to affect the discharge rate of the emitter.Through the numerical simulation of different structural parameters of the diaphragm,the relationship formula of the obtained discharge under different working conditions is fitted,which provides a theoretical basis and technical specification for the selection of diaphragm materials.
作者
刘娉楠
张金珠
王振华
刘宁宁
LIU Ping-nan;ZHANG Jin-zhu;WANG Zhen-hua;LIU Ning-ning;无(College of Water Conservancy&Architectural Engineering,Shihezi University,Shihezi 832000,China;Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production&Construction Group,Shihezi 832000,China;Industrial Technology Institute of the Xinjiang Production and Construction Corps,Shihezi 832000,China)
出处
《山东农业大学学报（自然科学版）》
北大核心
2022年第4期605-612,共8页
Journal of Shandong Agricultural University：Natural Science Edition
基金
新疆生产建设兵团重点领域创新团队项目(2019CB004)
兵团重大科技项目:干旱区现代灌区与智慧农业技术体系研究与示范(2021AA003)
兵团南疆重点产业创新发展支撑计划项目:南疆自压灌区节水控盐与水肥一体化关键技术集成研究与示范(202DB004)
石河子大学创新发展专项:新型分布式水肥一体化系统设计与施肥设备研发(CXFZ201905)。
关键词
灌水器
膜片
数值模拟
Emitter
diaphragm
numerical simulation
