Research Of Rotor Fragment Impact Failure Characteristics Of Aircraft Engine

Because of the improvement of aero-engine case, the probability of uncontained rotor failure has been decreased effectively. In order to improve the safety of the turbine under the condition of contained rotor failure, it sets up reasonable analysis of the impact failure of turbine guide vane by finite element method, after considering about the characteristics of rotor debris.In order to complete the hazard analysis of rotor debris in turbine, this paper researches the characteristics of rotor blade debris, then determines the reasons of turbine rotor failures and the failure modes.Based on the debris characteristics, this paper research the hazard analysis of rotor debris on turbine construction, especially the turbine guide vane. This paper uses finite element method to analyze the characteristics of impact failure on turbine guide vane with a software named ANSYS/LS-DYNA. The first step is to compare two kinds of constitutive models,which are often used in impact analysis domain, then Johnson-Cook constitutive model is chosen reasonably. TC4 titanium alloy is chosen to replace the nickel-base superalloy, because it's very hard to acquire the parameter of nickel-base superalloy. Two kinds of impact way is set up, and several initial conditions are chosen to complete the simulation. Then the simulation results are analyzed. The conclusion is that under the condition of erect impact,there are two impact of rotor debris, the second impact breaks the turbine guide vane, the kinetic energy of debris decreases after the impact and under the condition of inclined impact,there only one impact, the turbine guide vane is been punctured by rotor debris and the kinetic energy of debris will increase quickly after the impact.Further, two factor are researched to determine the influence on impact failure, such as the two different angles of turbine guide vane and the two different angles of rotor blade debris based on inclined debris impact. This conclusion may provide a help for turbine safety protection under the condition of contained rotor failure.