Numerical Study On Thermal-fluid-structure Coupling Of High Pressure Turbine Air-cooled Blade

Aero gas turbine engine,which is the power plant of civil aircraft,play an important role in developing science and technology and industry,helping enconomy and trade and increasing comprehensive national strength.Turbine blade works in the severest environment in aero-engine.Its performance and lifetime has influence on engine directly and remarkably.Subsequently,turbine blade impacts on reliability of engine and flight safety.The purpose of the paper is to study the thermal-fluid-structure coupling analysis method of aero-engine turbine blade and find the prediction method of high-pressure and low-cycle fatigue life.The main analysis methods are as follows:(1)The paper uses Fluent CFD software to calculate flow field and temperature field.ANSYS Workbench is used to transmit results to solid model.Then,Steady-State Thermal and Static Structure are used to calculate thermal,stress and strain.Finally,thermal-fluid-structure coupling finish.(2)Manson-Coffin theory is used to analyze low cycle-multiracial life prediction at high temperature.The main results are as follows:(1)Thermal-fluid-structure coupling is a method which exactly responds the interaction of fluid and structure.(2)There is a maximum pressure,which makes the air do not separate at the suction surface of the blade.(3)Main stream impacts more on blade surface temperature of suction surface.Cold stream impacts more on blade surface temperature of pressure surface.(4)The thermal load has a greater influence on the equivalent stress and strain.The aerodynamic load has a greater influence on the location of the maximum stress and strain.(5)Decreasing main stream temperature remarkably increases life of suction surface.Inlet temperature and pressure and cool air quality can not exactly predict the trend of life at dinger points.Results of trend of life at dinger points become close with engineering practice.So the method can be used in state monitoring,maintenance decision and improved design.And it can be also used in providing reference basis for life research of thermal-fluid-structure coupling.The method is an effective tool for aero-engine research.