涡轮增压器瞬态切换过程轴向力变化规律研究  

Study on the variation law of axial force during transient switching process of turbocharger

作　　者：王亚明 李晓杰[1] 董小瑞[1] 王军[1] 韩啸 WANG Yaming;LI Xiaojie;DONG Xiaorui;WANG Jun;HAN Xiao(School of Energy and Power Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学能源与动力工程学院,太原030051

出　　处：《重庆理工大学学报（自然科学）》2023年第10期211-219,共9页Journal of Chongqing University of Technology：Natural Science

基　　金：国防科技重点实验室基金项目(6142212210308)。

摘　　要：针对相继增压系统切换过程中时有增压器止推轴承损坏的情况,为提高切换过程中增压器的稳定性,以某型增压器为研究对象建立增压器的三维模型,通过Fluent划分网格,对压气机与涡轮机流场进行数值仿真,分析相继增压系统典型切换工况增压器轴向力的变化规律。结果表明:相继增压系统在切换过程中,瞬态切换时间越长,轴向力的波动时间占比越大;切换过程中增压器瞬态转速变化越大,轴向力振荡占比相对较小且最终的轴向力较高;影响增压器轴向力变化的主要因素是轮背的气体泄漏量、切换时间与转速变化量。Aiming at the damage of booster thrust bearing during the switching process of sequential turbocharging system,in order to improve the stability of the supercharger during the switching process,this paper takes a certain type of supercharger as the research object,and builds a three-dimensional model of the supercharger.The grid is divided by Fluent and the flow field of compressor and turbine is numerically simulated.The variation law of axial force of turbocharge under typical switching conditions of sequential turbocharging system is analyzed.The results show that during the switching process of the sequential turbocharging system,the longer the transient switching time,the greater the proportion of the fluctuation time of the axial force.During the switching process,the greater the transient speed change of the supercharger,the smaller the proportion of axial force oscillation and the higher the final axial force.The major factors influencing the axial force change of the supercharger include the gas leakage of the wheel back,the switching time and the speed change.

关 键 词：相继增压系统 涡轮增压器 轴向力 变化规律 瞬态 

分 类 号：U464.135.2[机械工程—车辆工程]