基于格子波兹曼方法研究颗粒对缸套-活塞环油膜压力的影响  

Influences of solid particles on oil film pressure in cylinder-piston ring based on lattice-Boltzmann method

作　　者：韩海燕[1] 张优云[2] 王凯 

机构地区：[1]西安交通大学城市学院机械系,西安710018 [2]西安交通大学机械工程学院,西安710049 [3]中国航天科工集团第六研究院二一〇所工艺室,西安710061

出　　处：《农业工程学报》2016年第11期109-116,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点基础研究发展计划(973计划)(No.2009CB724304-2)

摘　　要：为了研究小于油膜厚度的固体悬浮颗粒对活塞环流体润滑的影响,该文从流场角度分析发动机缸套-活塞环的润滑区域,建立了缸套-活塞环润滑问题的格子波兹曼离散模型,基于雷诺边界条件的负压归零法,分析了油膜破裂时格子波兹曼方法(lattice boltzmann method,LBM)模拟润滑油流动的边界条件的处理方法,基于LBM对含有固体颗粒的润滑油流动进行流场分析,研究了多个颗粒对于活塞环润滑性能的影响。得到了颗粒位置、形状,以及在不同曲柄转角下对活塞环油膜压力的影响;分析了润滑区域的油膜速度分布,并与试验结果进行了定性的比较。结果表明,当颗粒距离活塞环较近时,对于活塞环附近的油膜压力场影响较大,而当颗粒距离活塞环较远时,颗粒的存在对于活塞环的油膜压力场影响较小;并且对于缸套-活塞环下止点磨损较严重的实验现象给予了理论分析。Most liquid lubricating systems are inevitably supplied with lubricant containing contaminant particles. It is certain that some of these particles are suspended in the oil, that is, the size of the solid particle is smaller than the oil film thickness. In this paper, the effects of the suspended particles on the oil film pressure of cylinder-piston ring were mainly studied. In recent years, the lattice Boltzmann method（LBM） has been developed as an alternative to the conventional CFD（Computational Fluid Dynamics） methods. Unlike conventional numerical schemes based on discretization of macroscopic equations, the LBM is based on the statistical physics and describes the microscopic picture of particles movement in an extremely simplified way, but at the macroscopic level it gives a correct average description of the motion. It has been widely used to simulate the two-phase flow. The paper is aimed to study the influence of solid particles on the oil film pressure of piston ring based on L. The lubricate oil with suspended particles was regarded as the two-phase flow. The movement of the lubricate oil with solid particles is described with kinetic equations of distribution function of particles. A discrete Lattice-Boltzmann model of cylinder-piston ring was built in the domain of piston ring lubrication from the perspective of flow field. The implementation of boundary conditions for LBM is very important and has great effect on the accuracy and the stability of method. The bounce-back scheme was used in fluid-solid boundary and wall boundary treatment. The Reynolds boundary condition in the Lattice-Boltzmann Method was developed for the cracked oil film. By programming simulation, the influence of solid particles on the oil film pressure of piston ring was studied by researching the flow of the lubricant with solid particles based on LBM. The effect of particle location, shape and number on the oil film pressure of piston ring at certain crank angle was analyzed. The influence of solid particles on the oi

关 键 词：颗粒 润滑 压力 缸套-活塞环 格子波兹曼 油膜压力 

分 类 号：TK421.4[动力工程及工程热物理—动力机械及工程]