Visco-Elastohydrodynamic Model of a Hydraulic Rod Seal During Transient Operation
Visco-Elastohydrodynamic Model of a Hydraulic Rod Seal During Transient Operation
复制标题
瞬态操作期间液压杆密封件的粘弹流体动力学模型
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. F. Salant
中科院分区：
文献类型：
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作者：
A. Thatte;R. F. Salant
建立了液压杆密封瞬态工作过程的粘弹流体动力学模型。该模型包括宏、微观变形力学、接触力学和微观流体力学分析。粘弹性通过变形力学和接触力学进入分析。发展了一种有限元-有限体积混合计算框架，用于求解高度耦合的控制方程。粘弹性被认为会影响密封的泄漏和摩擦特性，通过其对流体压力和接触压力分布的变化的影响，作为杆速度和密封压力在一个周期中的变化。与纯弹性行为相比，粘弹性显著增加了最靠近密封端的密封区域中的流体压力和接触压力，在内冲程期间将流体压力峰值移离密封端，并且在外冲程期间增强了空化。它导致较厚的流体膜，并产生显着增加的Poilluille流在instroke。
A visco-elastohydrodynamic model of a hydraulic rod seal during transient operation has been developed. The model includes analyses of the macro- and microscale deformation mechanics and contact mechanics, and the microscale fluid mechanics. Viscoelasticity enters the analysis through the deformation mechanics and through the contact mechanics. A hybrid finite element-finite volume computational framework is developed to solve the highly coupled governing equations. Viscoelasticity is seen to affect the leakage and friction characteristics of the seal through its effects on the changing fluid pressure and contact pressure distributions as the rod velocity and sealed pressure change during a cycle. Compared with purely elastic behavior, viscoelasticity increases the fluid pressure and the contact pressure significantly in the sealing region closest to the sealed end, shifts the fluid pressure peaks away from the sealed end during the instroke, and enhances the cavitation during the outstroke. It results in thicker fluid films and produces a significant increase in the Poiseuille flow during the instroke.