结构参数对活塞环-气缸套润滑摩擦性能影响的数值模拟  

Numerical Simulation into Influence of Structural Parameters on Lubrication and Friction Performance of Piston Ring-Liner

作　　者：周龙[1,2] 白敏丽[1] 吕继组[1] 

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116023 [2]河南理工大学机械与动力工程学院,河南焦作454000

出　　处：《内燃机学报》2012年第5期456-461,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(50276007,50576008);辽宁省自然科学基金资助项目(20062180,20042156)

摘　　要：将三维瞬态热传导模型、动压润滑模型和润滑油膜传热模型耦合起来,并考虑了润滑油的黏-温变化、油膜破裂位置以及活塞环弹力在气缸套圆周方向上的非轴对称性等影响因素,开发了一种活塞环-气缸套三维非稳态热混合润滑摩擦模型.采用上述模型,对比分析了固体部件温度场、活塞环轴向高度和桶面高度3个结构参数对活塞环-气缸套润滑摩擦性能的影响.结果表明:在365.3°CA时,最小油膜厚度取得最小值,摩擦力取得最大值;活塞环、气缸套分别取进气下止点和燃烧上止点处的温度计算出的最小油膜厚度降低的幅度值为31.7%;活塞环轴向高度由2.00,mm增大到4.00,mm,最小油膜厚度增大的幅度值为74.5%,最大摩擦力降低的幅度值为45.7%;活塞环桶面高度由2.5,μm增大到5.0,μm,最小油膜厚度降低的幅度值为46.5%,最大摩擦力增大的幅度值为57.1%.A three-dimensional transient heat mixed lubrication and friction model of piston ring liner was de- veloped by coupling three-dimensional transient heat conduction model, dynamic lubricant model and heat transfer model of lubrication film, and considering effect factors of alteration of lube oil viscosity temperature, oil film fracture position and axis-asymmetry of piston ring tension in the circumferential direction of liner. Comparative analysis on influence of structural parameters on lubrication performance of piston ring liner including solid components temperature field, axial height and tubbish height of piston ring were made using the model. Results show that film thickness gets its minimum value and friction force gets its maximum value under the crank angle of 365.3°CA. Minimum film thickness reduces by 31.7% using the temperature of piston ring and liner under bottom dead center of charging and top dead center of combustion. Minimum film thickness increases by 74.5% and maximum friction force decreases by 45.7% when axial height of piston ring increases from 2.00 mm to 4.00 mm. Minimum film thickness decreases by 46.5% and maximum friction force increases by 57.1% when tubbish height of piston ring increases from 2.5 μm to 5.0 μm.

关 键 词：活塞环-气缸套 动压润滑 传热 耦合 结构参数 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]