摘要
综合考虑缸套热变形、缸套温度场、弹性变形以及润滑油变黏度等因素影响,建立活塞环-缸套摩擦副的瞬态流体动压润滑计算模型,分析发动机工况、活塞环-缸套接触面粗糙度方向和粗糙度大小对摩擦功耗和窜气量的影响。研究发现,当转速升高时,摩擦功耗升高,影响发动机效率;活塞环采用横向粗糙度方向和缸套采用纵向粗糙度方向的组合,能够同时使窜气量和摩擦功耗处于较低的水平;综合粗糙度一致时,采用活塞环表面粗糙度低于缸套表面粗糙度的组合,能有效降低摩擦功耗。
Considering the thermal deformation of cylinder liner,temperature field of cylinder liner,elastic deformation and variable viscosity of lubricating oil,the transient hydrodynamic lubrication model of piston ring-cylinder liner friction pair was established to analyze the effects of operating conditions,roughness direction and size of piston ring-cylinder liner contact surface on friction power consumption and blow-by gas.It was found that the friction power consumption increased and hence the engine efficiency was affected when the speed increased.The combination of transverse roughness direction of piston ring and longitudinal roughness direction of cylinder liner could simultaneously make the blow-by gas and friction power consumption remain at a low level.When the comprehensive roughness was the same,the combination of piston ring surface roughness lower than cylinder liner surface roughness could effectively reduce the friction power consumption.
作者
孔令春
白书战
李国祥
KONG Lingchun;BAI Shuzhan;LI Guoxiang(School of Energy and Power Engineering,Shandong University,Ji'nan 250061,China)
出处
《车用发动机》
北大核心
2023年第3期1-7,16,共8页
Vehicle Engine
基金
山东省重点研发计划项目(2021CXGC010703)。
关键词
柴油机
活塞环
气缸套
摩擦功耗
表面形貌
润滑特性
diesel engine
piston ring
cylinder liner
friction power consumption
surface morphology
lubrication characteristic
