Development and Application of an ALE Solver for Turbomachinery Aeromechanics

High Cycle Fatigue (HCF) is a key issue in the development and endurance of gas turbine engines that results from the flow-induced vibratory response of turbomachine blading to unsteady aerodynamic excitations. This paper describes the development and application of TAM-ALE3D, an Arbitrary Lagrangian Eulerian (ALE) finite element coupled fluid- structure interaction solver, to axial and radial flow turbomachinery aeromechanics issues. The incorporation of turbomachinery-specific algorithms enables the analysis of crack generation in the Inlet Guide Vanes (IGVs) of a modern transonic compressor due to resonant vibrations generated by the potential/shock field of the downstream rotor. The capability to model turbulent wake forcing functions makes possible predictions of the resonant vibratory stress resulting from the subsonic rotor wakes interacting with the downstream stators. The modification of outflow boundary conditions to model incoming acoustic waves allows the unsteady aerodynamic response of a high-speed centrifugal compressor impeller to the potential/shock excitation generated by the downstream radial- vaned diffuser to be simulated. Finally, the impeller blade aerodynamic damping is calculated to quantify the effect of blade-motion induced aerodynamics at the exducer.

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