A fluid-solid coupled approach is presented for investigating turbine blade fatigue life in a vehicle turbocharger under the parallel computation of aeroelasticity. The unsteady flow field of rotor is studied in a CFD model of the turbine flowpath, coupled with a finite element model for the impeller to identify modal shapes, natural frequencies, vibratory stress and the structural deformations. Based on the interface exchange of information between the fluid and structural domains, interactions between fluid and structure are calculated in a coupled manner. The numerical simulation is proceeded under different angle of attack and back pressure. In addition the influence of inlet total pressure fluctuation is considered. The inlet total pressure fluctuation is the function of 1st and 3rd natural frequency of impeller. The result shows that the maximum stress is less than the yield stress. The fatigue life will overpass ten million cycles.

Volume Subject Area:
Vibration, Acoustics and Wave Propagation
Keywords:
unsteady flow computation, potential excitation, stress, high cycle fatigue
Topics:
Computation, Excitation, Stress, Turbine blades, Turbochargers, Unsteady flow, Vehicles, Vibration, Fluids, Pressure, Fatigue life, Impellers, Aeroelasticity, Computational fluid dynamics, Computer simulation, Cycles, Deformation, Finite element model, High cycle fatigue, Overpasses, Rotors, Shapes, Turbines, Yield stress
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