涡轮增压器转子轴向力的CFD数值分析

Analysis of Rotor Axial Force of Turbocharger

针对汽油机涡轮增压器止推轴承损坏现象,以某型号涡轮增压器为研究对象,使用CFD流体软件分析转子轴向力随转速、质量流变化的一般规律。构建涡轮增压器转子系统的三维模型,然后使用ICEM对三维模型进行网格划分,最后使用CFX求解器对三种不同转速工况下进行涡轮场、叶轮场进行数值分析仿真。分析结果表明,转子系统两端轴向力随着转速增加,涡轮增压器轴向力合力不断增大;同时研究发现涡轮端轴向力随质量流量增加而增大,压气机端轴向力却逐渐下降,两者变化趋势正好相反;同一转速下,增压器轴向合力随质量流增加而减小;质量流不变,涡轮端、压气机端轴向力均随转速提升而增大。

In view of the damage phenomenon of the thrust bearing of the gasoline engine turbocharger,this article takes a certain type of turbocharger as a study and uses CFD fluid software to analyze the general rules of the change of the rotor axial force with the rotation speed and mass flow.。Construct a three-dimensional model of the turbocharger rotor system,then use ICEM to mesh the three-dimensional model,and finally use the CFX solver to conduct numerical analysis and simulation of the turbine field and impeller field under three different speed conditions.o The analysis results show that:the axial force at both ends of the rotor system increases with the increase of rotation speed,and the resultant axial force of the turbocharger continues to increase;at the same time,the study found that the axial force at the turbine end increases with the increase of mass flow rate,and the axial force at the compressor end increases.。But gradually decreases,and the two changing trends are exactly the opposite;at the same speed,the axial resultant force of the supercharger decreases with the increase of mass flow;the mass flow remains unchanged,and the axial force of the turbine end and compressor end both increases with the increase of rotation speed.