摘要
柱塞泵在高速高压下运行时,柱塞和缸体之间常常存在一定倾角,使得柱塞副出现摩擦磨损或柱塞卡滞现象,严重影响其服役寿命。为研究柱塞倾斜对柱塞副润滑及泄漏特性的影响,引入压力流和剪切流影响因子修正间隙流动的雷诺控制方程,建立考虑柱塞偏斜下的油膜厚度方程,采用有限元方法分析柱塞副的润滑及泄漏特性,得到以下结论:柱塞倾角对柱塞副的润滑特性影响极大,柱塞倾斜时的最大油膜压力明显增大,最小油膜厚度明显减小;倾角为0.00015°时,柱塞副内的润滑状态由弹流润滑向混合润滑转变,倾角为0.00025°时最大油膜压力约为无倾斜时的14倍;柱塞倾角对柱塞副的泄漏特性影响不大,随柱塞副的两端压力差增大,单个柱塞副的泄漏比大部分呈近似线性增大的趋势,当接触长度较小时,泄漏量大且变化曲线的斜率较陡;当单边间隙增加到一定值时,泄漏比显著增大。研究结果为航空柱塞泵柱塞副的精确理论设计及核心旋转组件的失稳问题研究提供参考。
When the plunger pump is running at high speed and high pressure,there is often a certain inclination angle between the plunger and the cylinder body,which causes friction and wear or plunger jamming of the plunger pair,seriously affecting its service life.To study the effect of plunger deflection on the lubrication and leakage characteristics of plunger pairs,the influence factors of pressure and shear flow were introduced to correct the Reynolds governing equation of the clearance flow,the oil film thickness equation considering the deflection of the plunger was established,and the lubrication and leakage characteristics of the plunger pair were analyzed using finite element method.The results show that the inclination angle of the plunger has a significant influence on the lubrication characteristics of the plunger pair,the maximum oil film pressure of the tilted plunger increases significantly,while the minimum oil film thickness decreases significantly.When the inclination angle is 0.00015°,the lubrication state inside the plunger pair transitions from elastohydrodynamic lubrication to mixed lubrication,and when the inclination angle is 0.00025°,the maximum oil film pressure is about 14 times that of non inclination.The inclination angle of the plunger has slight effect on the leakage characteristics of the plunger pair.As the pressure difference between the two ends of the plunger pair increases,the leakage ratio of a single plunger pair increases approximately linearly.When the contact length is small,the leakage volume is large and the slope of the vary curve is steep.When the unilateral clearance increases to a certain value,the leakage ratio increases significantly.The research can provide references for the plunger pairs precise theoretical design and the instability of the core rotating components of aviation piston pumps.
作者
杜媛英
曹沁鑫
王文山
浦海燕
陈伯简
DU Yuanying;CAO Qinxin;WANG Wenshan;PU Haiyan;CHEN Bojian(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China;Qingan Group Co.,Ltd.,Xi′an Shaanxi 710077,China;Jiangsu Shuangda Pump Industry Co.,Ltd.,Jingjiang Jiangsu 214537,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2024年第10期9-15,共7页
Lubrication Engineering
基金
国家自然科学基金项目(51905243)
甘肃省青年科技基金项目(23JRRA748)
兰州理工大学红柳优秀青年基金支持计划项目(062213)。
关键词
柱塞副
偏斜
油膜压力
润滑
泄漏
plunger pair
deflection
oil film pressure
lubrication
leakage
