自由涡轮叶片/轮盘耦合振动特性分析

摘要

自由涡轮是航空发动机的关键部件,其工作环境非常恶劣,承受着离心载荷、热载荷、气动载荷及振动载荷等的复合作用。利用UG软件对某型自由涡轮2级涡轮轮盘/叶片进行3维实体建模,导入ANSYS构建其耦合振动分析的有限元模型,以静强度分析中的模型为基础,考虑温度场和离心载荷的影响,计算出涡轮叶片/轮盘不同转速下的动频。从Campbell图可见,涡轮叶片/轮盘在工作转速下没有发生共振的危险,该型涡轮设计合理。%Free turbine is a key component of an aeroengine,its working environment is very poor.It bears the centrifugal load,heat load,aerodynamic loads and vibration loads and etc.The 3D solid modeling of a free turbine disk / blade was built using UG software.The three-dimensional model was imported into ANSYS to establish the finite element model of coupled vibration.Based on the model in the static strength analysis,the dynamic frequency of turbine disk / blade at different rotor speed was calculated considering the effect of temperature field and centrifugal loads.According to Campbell diagram,turbine disk / blade has no risk of resonance at rotor speed.The turbine design is reasonable.