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首页> 外文会议>2001 Fall Technical Conference of the Asme Internal Combustion Engine Division, 2001, Sep 23-26, 2001, Argonne, Illinois >Modeling of Axial and Circumferential Ring Pack Lubrication
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Modeling of Axial and Circumferential Ring Pack Lubrication

机译：轴向和周向环填料润滑的建模

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摘要

The ring-pack lubrication is a complicated physical process involving multiple physical phenomena. This paper presents an attempt to model the ring-pack lubrication in three-dimensional space, considering the ring-bore structure interaction, bore distortion, ring-twist, piston secondary motion, non-Newtonian lubricant behavior, and ring/bore asperity contacts. The physics of the model includes the interface between the structure of the ring, oil lubricant, and the structure of the cylinder liner. The ring is modeled as a three-dimensional FEA model with the nodes along the ring circumference. The ring face orientation changes circumferentially depending on ring geometry as well as piston tilt angle and three-dimensional ring twist angle at every crank angle degree. The oil lubrication is modeled with the Reynolds equation with shear thinning and temperature dependent oil viscosity and with or without the flow factors. The cylinder liner description allows three-dimensional bore distortion and ring/liner asperity contact to be modelled. The key of the analysis is solving simultaneously at every crank angle increment a set of coupled linear and non-linear equations of ring structure, ring face lubrication, bore distortion, and asperity contact. The model predicts variations of the ring-pack lubrication in the axial and circumferential directions. Using the hydrodynamic lubrication model coupled with the asperity contact model allows calculations of the friction forces due to asperity contact (boundary and mixed lubrication) and oil film interactions (hydrodynamic and mixed lubrication). The transition from hydrodynamic lubrication to boundary lubrication through mixed lubrication is determined interactively based on ring / liner surface properties, ring loads, and lubrication properties. The new friction sub-module calculates axial and circumferential variation of both types of friction forces as well as total friction. The asperity contact induced friction forces and asperity contact pressure can further be used for ring wear calculations. The developed model has been applied to determine the performance of a production engine ring-pack. The influence of different phenomena affecting the ring-pack performance has been analyzed and compared.
机译：密封环润滑是一个复杂的物理过程，涉及多种物理现象。本文提出了一种在三维空间中对环组润滑建模的尝试，其中考虑了环孔结构相互作用，孔变形，环扭转，活塞二次运动，非牛顿润滑剂行为以及环/孔粗糙接触。该模型的物理特性包括环的结构，润滑油的结构和气缸套的结构之间的界面。环被建模为三维FEA模型，其中节点沿着环的圆周。齿环的朝向根据齿环的几何形状以及活塞倾斜角和每个曲柄角度的三维环扭角而沿周向变化。使用雷诺方程对油润滑进行建模，该方程具有剪切稀化和与温度相关的油粘度，并且可以带有或不带有流量系数。气缸套描述允许对三维孔变形和环/衬套粗糙接触进行建模。分析的关键是在每个曲柄角增量处同时求解一组环结构，环面润滑，孔变形和粗糙接触的耦合线性和非线性方程。该模型预测了环填料润滑在轴向和圆周方向上的变化。将流体动力润滑模型与粗糙接触模型结合使用，可以计算由于粗糙接触（边界润滑和混合润滑）和油膜相互作用（流体动力和混合润滑）引起的摩擦力。根据环/衬套的表面特性，环载荷和润滑特性，交互确定从流体动力润滑到混合润滑的边界润滑的过渡。新的摩擦子模块可计算两种类型的摩擦力以及总摩擦的轴向和周向变化。粗糙接触引起的摩擦力和粗糙接触压力可进一步用于环磨损计算。已开发的模型已用于确定量产发动机环形组件的性能。分析并比较了不同现象对环填料性能的影响。

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