Aeroacoustics of Real Blade Cascades
Kenneth A. Kousen and Joseph M. Verdon
United Technologies Research Center
East Hartford, Connecticut
Abstract
A linearized unsteady aerodynamic analysis is applied to study the
aeroacoustic properties of cascades. The analysis allows an
assessment of the effects of real blade geometry and mean blade
loading on the acoustic response of a cascade to external aerodynamic
excitations. The acoustic responses to vortical excitations at
multiples of the blade passing frequency for a cascade of fan exit
guide vanes are described. The acoustic responses to acoustic
excitations at various incidence angles are also described and
compared to analogous flat plate results, where qualitative
differences are observed.
This paper appeared in the Atassi, H.M> (ed.), Unsteady
Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines and
Propellers, Springer-Verlag, New York, NY, 1993, pages 725-742.
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