J. Phys. III France
Volume 2, Numéro 9, September 1992
Page(s) 1813 - 1833
DOI: 10.1051/jp3:1992109
J. Phys. III France 2 (1992) 1813-1833

Aerodynamically forced response and flutter of structurally mistuned bladed disks in subsonic flow

Gregory H. Henderson and Sanford Fleeter

Thermal Sciences and Propulsion Center, School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, U.S.A.

(Received 13 May 1991, revised 7 April 1992, accepted 22 April 1992)

To analyze the aeroelastic characteristics of structurally mistuned rotors both flutter and forced response, a structural dynamics model appropriate for flexible bladed disks is developed utilizing flexible disk theory and small perturbation gust and motion-induced unsteady aerodynamic analyses. This model is then used to investigate the effects of structural mistuning on rotor aeroelasticity. Mistuning is found to be beneficial for flutter stability, with the motion-induced unsteady aerodynamics and thus the stability somewhat dependent on the far field acoustic wave behavior generated by the blade motion, as indicated by the acoustic resonance conditions. With regard to forced response, mistuning is shown to be generally detrimental.

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