增压器钛铝涡轮过盈连接结合强度研究  

Bonding Strength of Interference Connection for Supercharger TiAl Turbine

作　　者：陈光[1,2] 彭前亮 刘烨 景国玺 陈升 刘晓昂 CHEN Guang;PENG Qianliang;LIU Ye;JING Guoxi;CHEN Sheng;LIU Xiaoang(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130,China;Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles,Tianjin 300130,China;China North Engine Research Institute(Tianjin),Tianjin 300406,China)

机构地区：[1]河北工业大学机械工程学院,天津300130 [2]天津市新能源汽车动力传动与安全技术重点实验室,天津300130 [3]中国北方发动机研究所(天津),天津300406

出　　处：《车用发动机》2024年第3期18-24,共7页Vehicle Engine

基　　金：国防重点实验室项目(61422120301);河北省高层次人才资助项目(B2021003025)。

摘　　要：轻质钛铝(TiAl)涡轮能够显著提高涡轮增压发动机的动力性能,而TiAl涡轮与K418过渡体之间的过盈连接失效问题对增压器安全运行有重要影响。考虑了TiAl涡轮和K418过渡体材料非线性、损伤准则,建立了TiAl涡轮过盈连接强度有限元模型,通过拉伸试验验证了该模型的准确性。在此基础上,构建了接触应力与摩擦系数的关系公式,并探索了温度和高温条件下转速对TiAl涡轮过盈连接强度的影响。结果表明:在400~700℃时,随着温度上升,结构过盈界面接触应力衰减呈上升趋势,过盈连接强度下降幅度增加;在高温条件下,转速越大,过盈连接强度下降幅度越大。Lightweight titanium-aluminum(TiAl)turbine can significantly improve the power performance of turbocharged engines,but the interference connection between the TiAl turbine and the K418 bushing will produce the failure that has an important impact on the safe operation of supercharger.The material nonlinearity damage criterion of TiAl turbine and K418 bushing was studied,a finite element model of structural strength for the interference connection between TiAl turbine and K418 bushing was established,and the accuracy of model was verified through tensile test.Then the relationship formula between contact stress and friction coefficient was constructed,and the influence of temperature and rotational speed on the strength of TiAl turbine interference joint under high temperature conditions was explored.The results show that the contact stress attenuation at the structural interference interface shows an upward trend with the increase of temperature and the decrease of interference connection strength increases between 400℃and 700℃.At high temperatures,the higher the speed,the greater the decrease in interference connection strength.

关 键 词：涡轮 摩擦系数 接触应力 过盈连接 结构强度 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]