相继增压系统切换过程对增压器辅推轴承轴向力影响与轴承优化研究  

Influences of Switching Process of Successive Turbocharging Systems on Axial Force of Booster Auxiliary Bearing and Research on Bearing Optimization

作　　者：李垂孝 张学艳 姜久奎 黄立 李先南 张伟 张博 LI Chuixiao;ZHANG Xueyan;JIANG Jiukui;HUANG Li;LI Xiannan;ZHANG Wei;ZHANG Bo(Shanghai Marine Diesel Engine Research Institute,Shanghai 201108,China;CRRC Da Lian Institute Co.,Ltd.,Dalian 116021,China)

机构地区：[1]中国船舶集团有限公司第七一一研究所,上海201108 [2]中车大连机车研究所有限公司,大连116021

出　　处：《内燃机工程》2024年第2期85-92,101,共9页Chinese Internal Combustion Engine Engineering

基　　金：船舶动力基础科研计划项目。

摘　　要：采用数值仿真方法研究基本增压器在系统切换过程中的轴向力变化规律,并提出了辅助推力轴承的改进设计方法。首先数值仿真研究了基本增压器的转子系统在切换时的压气机/涡轮关键典型截面气动参数分布情况,分析了在柴油机增压模式切换过程中基本增压器转子轴向力大小和方向变化规律,然后提出了增加轴承承力面及改变承力面材料的优化方案。结果表明:基本增压器辅助推力轴承在切换的5 s时间内轴向力发生翻转,最大约承受2273 N的反向轴向力,是造成切换过程辅助推力轴承磨损的关键原因;优化方案最大承载能力为优化前的4.8倍,显著提升了辅助推力轴承承载力。经增压器平台可靠性验证,改进后的增压器辅助推力轴承在相同时间内未出现碰磨现象。The variation law of the axial force of the basic supercharger during system switching was studied by the numerical simulation method,and the improved design method of the auxiliary thrust bearing was put forward.The distribution of aerodynamic parameters of key typical sections of compressor/turbine when the rotor system of the basic supercharger switched was studied by numerical simulation,and the variation law of axial force and direction of the rotor of the basic supercharger during the switching of diesel engine supercharging mode was analyzed.Then the optimization scheme of increasing bearing surface and changing bearing surface material was put forward.The results show that the axial force of the auxiliary thrust bearing of the basic supercharger turns over within 5 s,and it bears about 2273 N reverse axial force at most,which is the key reason for the wear of the auxiliary thrust bearing during the switching process.The maximum bearing capacity is 4.8 times of that before improvement,which significantly improves the bearing capacity of auxiliary thrust bearing.After the reliability verification of the supercharger platform,rubbing phenomenon did not appear for the improved supercharger auxiliary thrust bearing in the same time duration.

关 键 词：相继增压 压气机 涡轮 转子轴向力翻转 低速喘振 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]