稳定工况下曲轴轴颈与轴瓦间隙机油流动模拟分析

Simulation Analysis of Engine-oil inside the Clearance between Crankshaft Journal and Bearing Shells in Stable Conditions

针对发动机在使用过程中,由于曲轴主轴颈、连杆轴颈与轴瓦间的配合间隙设计不合理,出现供油不足或局部缺油,无法形成动压油膜而导致的烧瓦问题,以某型柴油发动机为研究对象,利用流体分析前处理软件GAMBIT建立理想稳定工况下机油流场的三维几何模型,并通过计算流体力学FLUENT软件对曲轴主轴颈、连杆轴颈与轴瓦间的机油进行模拟仿真。结果表明:通过仿真能够直观地了解发动机在理想稳定工况下曲轴主轴颈、连杆轴颈与轴瓦间隙间的机油流动情况和压力分布,这为进一步优化曲轴润滑系,改进润滑方案,提高润滑效率提供了参考依据。

For the bush-burning problem in the course of the engine operation due to the inadequate supply or partial lack of oil between crankshaft main journal and crankshaft bearing as well as the rod journal and rod bearing resulting from the unreasonable design of the bearing lubricating clearance. Taking a certain kind of engine as reference, build a 3D geometric model of the engine-oil flow field in the ideal stable conditions with GAMBIT and conduct a simulation of it with FLUENT. It reveals that an intuitive understanding of the flow state and pressure distribution of the engine-oil inside the clearance between the crankshaft main journal and crankshaft bearing as well as the rod journal and rod bearing has been grasped which provides basis for a further refining of bearing lubrication system, improving the lubrication method and enhancing the efficiency of the lubrication.