水轮机主轴磁流体密封间隙流场关键参数研究  

Research on Key Parameters of Clearance Flow Field of Hydroturbine Spindle Magnetic Fluid Seal

作　　者：程杰 李正贵[2] 王端喜 彭小东 张现海 杨洋 CHENG Jie;LI Zhenggui;WANG Duanxi;PENG Xiaodong;ZHANG Xianhai;YANG Yang(Sichuan Huaneng Jialingjiang Hydropower Co.,Ltd.,Nanchong Sichuan 637000,China;Key Laboratory of Fluid and Machinery,Ministry of Education,Xihua University,Chengdu Sichuan 610039,China)

机构地区：[1]四川华能嘉陵江水电有限责任公司,四川南充637000 [2]西华大学流体与机械教育部重点实验室,四川成都610039

出　　处：《润滑与密封》2023年第11期172-180,共9页Lubrication Engineering

基　　金：国家自然科学基金项目(52079118);四川省科技厅项目(2023YFQ0021);广安市科技局项目(2022GYF01)。

摘　　要：水轮机主轴磁流体密封装置间隙流场因工况和物理场的复杂性一直是磁流体密封研究难点。为研究水轮机主轴磁流体密封装置间隙内磁流体流动特性,建立主轴密封间隙流场数值模型并通过试验进行了验证;通过数值计算研究密封间隙、极齿宽度、极齿高度和极齿槽宽度对磁流体流动的影响。结果表明:极齿附近磁流体不受结构参数影响,基本保持不动;当密封间隙小于0.6 mm时,间隙内磁流体基本不发生流动,当密封间隙超过该值后,极齿槽和永磁体附近磁流体随间隙增加流动加剧,速度线性递增;极齿槽和永磁体附近磁流体随极齿宽度递增流动减弱,速度先线性递减,在3.0~3.5 mm极齿宽度时急剧减小,最后趋于稳定;随着极齿高度和极齿槽宽度逐渐增加,极齿槽和永磁体附近磁流体流动会减弱,极齿槽附近磁流体速度在极齿高度为1.0~3.5 mm和极齿槽宽为3.0~12 mm速度急剧减小,最后趋于稳定,而永磁体附近磁流体速度一直呈线性递减。Due to the complexity of working conditions and physical fields,the clearance flow field of the magnetic fluid sealing device for the main shaft of hydraulic turbine has always been a difficult point in the research of magnetic fluid seal.To study the flow characteristics of magnetic fluid in the clearance of the magnetic fluid sealing device for the main shaft of a hydraulic turbine,a numerical model of the flow field in the seal clearance of the main shaft was established and verified through experiments.The influence of the seal clearance,the width of the pole tooth,the height of the pole tooth and the width of the pole tooth slot on the flow of the magnetic fluid was studied by numerical calculation.The results show that the magnetic fluid near the pole tooth is not affected by the structural parameters and basically remains stationary.When the seal clearance is less than 0.6 mm,the magnetic fluid in the clearance basically does not flow.When the seal clearance exceeds 0.6 mm,the magnetic fluid near the pole slot and permanent magnet increases with the increase of the seal clearance,and the speed increases linearly.The flow of magnetic fluid near the pole tooth slot and permanent magnet decreases with the increase of the width of the pole tooth,and the velocity decreases linearly at first,decreases sharply at the width of the pole tooth from 3.0 mm to 3.5 mm,and finally tends to be stable.With the gradual increase of the height of the pole teeth and the width of the pole tooth slot,the magnetic fluid flow near the pole teeth and the permanent magnet will weaken.The magnetic fluid velocity near the pole teeth and slots will decrease sharply at the the height of the pole tooth from 1.0 mm to 3.5 mm and the width of the pole teeth from 3.0 mm to 12 mm and finally become stable,while the magnetic fluid velocity near the permanent magnet has been decreasing linearly.

关 键 词：水轮机 磁流体密封 结构参数 间隙流场 磁性液体 

分 类 号：TB42[一般工业技术]