油气弹簧主活塞斯特封泄漏流量计算与仿真研究

摘要

To study the working stability of Stepseals in main piston of hydro-pneumatic springs in a wide range of temperature,a fluid dynamic seal model is established based on mechanics of materials and hydrodynamics.The theoretical formula of Stepseals leakage is deduced.The effects of temperature,piston velocity,pre-compression ratio and groove dimensions on leakage are analyzed using film pressure data from finite element models.Results show that the increase in piston velocity,the decrease in pre-compression ratio and the increase in groove dimensions lead to more leakage of Stepseals,and higher temperature also causes more leakage in allowable temperature range.%针对油气弹簧主活塞斯特封宽温域条件下的工作稳定性问题,基于材料力学及流体动力学分析与计算,建立了流体动密封数学模型,推导出了斯特封泄漏流量的理论计算公式;运用有限元模型获取密封间隙处的油膜压力数据,研究了工作温度、往复运动速度、预压缩率及沟槽尺寸对斯特封泄漏流量的影响规律.结果表明:同等工况下,往复运动速度增加、预压缩率减小、沟槽宽度或深度增大都会增加斯特封的泄漏流量;在材料许用温域范围内,随着工作温度的升高,斯特封的泄漏流量增加.