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Simulation of Turbomachine Blade Bending-Torsion Flutter Using a Pretwisted Beam Finite Element

Ilya Fyodorov
A review of turbomachine blade flutter is given, highlighting the importance of coupled bending-torsion blade flutter. A pretwisted beam finite element blade model for coupled fluid-structure stand-alone blade dynamics assessment is introduced. Stability analysis of a typical last-stage power generation turbine blade under non-stationary gas loading is conducted and its dynamic bifurcation mechanism is investigated.
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