Abstract
A review is presented of stall flutter prediction methodology including empirical, analytical, and semiempirical approaches. Because of the lack of accurate and efficient unsteady aerodynamic models for stall flutter predictions, interim semiempirical methods are developed to assist turbomachinery designers during the development of current advanced fan and compressor designs for both military and commercial applications. A semiempirical approach that builds on an empirical stall flutter database combined with a classical flat plate linearized unsteady aerodynamic model that accounts for chordwise deformations has been developed. This model is shown to provide good correlations when compared to isolated airfoil and cascade data for standard configurations. When applied to low aspect ratio fans, this approach provided excellent correlations with experimental results.
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