基于SPH方法的活塞环岸润滑油输运的数值研究

Numerical Simulation of Oil Transport on the Land of an Internal Combustion Engine Piston Based on SPH Method

活塞环岸润滑油的输运过程是一个典型的复杂多相流问题,该过程对柴油机动力性和排放等性能有显著影响。应用N-S方程描述润滑油的输运过程,并对润滑油输运的物理模型和初始条件进行简化,首次利用SPH方法求解活塞环岸上润滑油膜的状态。研究表明SPH方法可以准确描述润滑油输运过程中的各种复杂状态,能对各个部位润滑油膜的厚度及各个时刻可用润滑油量进行预测。为研究和预测柴油机润滑油膜的输运过程提供了一种新的思路和方法。

The lubricating oil transport process on the land of an internal combustion engine piston was a typical complex multiphase flow problem,which had a significant impact on the power and emission of diesel engine.The Navier-Stokes equations are used to describe the oil transport process.The physical model and initial conditions of the oil transport process were simplified.The SPH method was used to solve the state of the lubricating oil film on the piston land for the first time.The results showed that the SPH method could be described all kinds of complex states in oil transport process accurately.The SPH method could be predicted the thickness of oil film all parts of piston land and the amount of lubricating oil available at all times.This paper provided a new way to study and predict the states of lubricating oil film of diesel engine.