低速柴油机启动工况下主轴承瞬态润滑分析

A transient mixed thermal elastohydrodynamic(TEHD) lubrication analysis model of the main bearing of a low-speed diesel engine was established based on oil film thickness equations，average Reynolds equations，energy equations and dynamic equations. Time-varying working conditions，thermal and elastic deformation and roughness were considered in the model. Based on the model，the effects of oil inlet temperature，radius clearance and startup time on lubrication performances of the main bearing，including contact force，thickness and pressure of the oil film and temperature distribution，were analyzed. The results show that for the main bearing of the low-speed diesel engine studied，the contact force is reduced and the time of mixed lubrication is shortened by reducing the oil inlet temperature during startup. The influence of radial clearance on lubrication characteristic parameters can be almost ignored in the early stage of startup process. Shortening the starting time can reduce the temperature rise and contact force to a certain extent.