摘要
基于活塞环表面激光微造型的实际形貌，建立活塞环表面具有规则微观抛物面凹腔结构的润滑理论模型，采用变异多重网格法对理论模型进行数值求解，获取表面微观形貌几何参数对润滑性能的影响规律。结果表明：通过在活塞环表面造型，会产生明显的流体动压力。微观凹腔的面积占有率Sp对膜厚及无量纲平均摩擦力的影响不明显，当Sp从5％变化到60％时，无量纲平均摩擦力改变了18．6％。相反，微观凹腔的深度危，影响显著，存在的最佳深度为2～7μm，当hp〉8μm时，无量纲平均摩擦力增大，膜厚变薄，且一个周期内的膜厚曲线变化不规则。
Based on the real structure of the LST Piston ring, a lubrication model was developed for the piston ring with regular microstructure in the form of paraboloid profile dimples. The influence of surface micro-geometry shape parameters on piston ring lubrication performance was obtained by solving the dimensionless Reynolds equation with modified multi-grid method. The results show that piston ring through LST can efficiently produce hydrodynamic pressure. Meanwhile, it was also found that the area density of the micro-pores, Sp, has little effect on the minimum film thickness and dimensionless average friction force since S, varying from 5% to 60% corresponds to 18.6% variation in the dimensionless average friction force： The depth of the pores has great influence on the lubrication performance. The optimized pore depth was about 2-7 μm. when hp 〉 8 μm, the dimensionless average friction force increases largely, and the minimal film thickness decreases obviously and film thickness curve varies irregular within one cycle.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2009年第2期180-185,共6页
Transactions of Csice
基金
国家自然科学基金资助项目(50475122)
江苏省高技术重大项目(BG2007023)
江苏省六大人才高峰项目(08-B-04)
中国博士后基金项目(20070420190)
江苏省博士后基金项目(0702009B)
关键词
激光微造型
活塞环
雷诺方程
变异多重网格法
润滑性能
Laser micro-texturing
Piston ring
Reynolds equation
Modified multi-grid method
Lubrication performance
