The 3D Transient Coupling Heat Transfer Simulation of Lubrication Oil Film as a Coupling Component for Piston Set-Cylinder Liner

摘要

There are two kinds of unsteady state heat transfer in internal combustion engine, those are cycle instantaneous and transient condition. Compared with cycle instantaneous heat transfer, one cycle, or several cycles are adopted as a time step to simulate the heat transfer under transient condition because it cost much longer time. Piston set passes through the surface of cylinder liner several times within a time step. By resolving sliding contact condition that is difficult for a single method, based on the lubrication and friction analysis of piston ring in this paper, by considering coupled heat transfer of piston set-cylinder liner interface components and the related physics fields, a coupled heat transfer model that gas, piston set-cylinder liner and coolant could be simulated as a whole was proposed and applied to a 6110 diesel engine. Simulation results show that the heat transfer simulation of three-dimensional transient condition for piston set-cylinder liner coupled system reflects actually the heat transfer performance of coupling system, after the lubrication and friction analysis for piston ring is carried out.