基于FLUENT的涡轮增压器推力轴承特性分析

Simulation Analysis of Turbocharger's Thrust Bearings Based on FLUENT

轴向推力轴承,又称为止推轴承,被广泛应用于涡轮增压器中,增压器转子系统中产生的轴向力都是由轴向推力轴承承受。本文对涡轮增压器滑动轴承模型进行基于FLUENT的全三维数值仿真分析,得到轴向推力轴承三维油膜压力、流场、温度分布。通过分析,得到了稳态下轴向推力轴承油膜压力场、温度场、流场在不同转速下的分布特点:随着转速的上升,推力轴承内部流场的峰值压力随之上升,推力轴承承载能力与滑油流量也随之上升,并且峰值压力、轴向推力以及滑油流量和转速的关系是呈等比例上升;同时对比分析了转子转速、楔形深度、最小油膜厚度等一些关键参数对轴向推力轴承性能的影响。

Floating thrust bearings,also known as thrust bearings,are widely used in turbochargers.The axial thrust generated in the turbocharger rotor system is borne by the axial thrust bearings.In this paper,the full three-dimensional numerical simulation analysis of turbocharger sliding bearing model based on FLUENT is carried out,and the three-dimensional oil film pressure,flow field and temperature distribution of axial thrust bearing are obtained.The distribution characteristics of oil film pressure,temperature and flow field of axial thrust bearing under steady state are obtained by analysis.With the increase of rotational speed,the peak pressure of internal flow field of thrust bearing increases,and the load-carrying capacity of thrust bearing increases with the increase of oil flow rate.The relationship between peak pressure,axial thrust,oil flow rate and rotational speed increases in an equal proportion.At the same time,the rotor speed,wedge depth and minimum oil film thickness are compared and analyzed.The influence of some key parameters on the performance of thrust bearings is discussed.