活塞环-气缸套润滑摩擦研究

活塞环与气缸套间的润滑、摩擦直接影响到内燃机的动力性、经济性和可靠性。在内燃机实际运行过程中，缸内工作过程循环变动及活塞气缸套间动接触导热直接影响到润滑油膜的状态，因而活塞环在缸套中的不同位置时的摩擦、润滑状态各不相同。在传统的活塞环组稳态热混合润滑的基础上，考虑到活塞组一气缸套动接触系统瞬态传热，建立了活塞环组的非稳态热混合润滑、摩擦数理模型及数值方法。运用该方法可模拟出活塞环组润滑、摩擦特性，并可预测出不同瞬时润滑油膜的温度场、压力分布、油膜厚度、摩擦功和摩擦热等重要参数。

A Study on Lubrication and Friction on Piston-Ring Pack in IC Engine

Lubrication and friction on Piston-Ring Pack in IC Engine will directly influence the engine power, the fuel economy and the reliability. During engine operation, the cyclic variation of working process in cylinder and the heat transfer under dynamic contacting between the piston and cylinder bore influence the state of oil film. Thus, the state of lubrication and friction for the piston-ring Pack is variable in different positions. This paper concentrated on the mathematic and physical model as well as its numerical calculation for this transient, thermal and mixed lubrication and friction between piston ring and cylinder bore based on the steady, thermal and mixed lubrication properties of the conventional piston ring pack through introducing the instantaneous heat transfer under dynamic contacting between piston sets and cylinder liner. The lubrication and friction properties of piston ring pack, and parameters such as the temperature fields of piston and liner, film thickness, film temperature, friction force and friction heat etc. can be simulated by the method.