Coupled Blade-Disk-Shroud Flutter Instabilities in Turbojet Engine Rotors

[+] Author and Article Information
F. O. Carta

Aerophysics Section, United Aircraft Research Laboratories, East Hartford, Conn.

J. Eng. Power 89(3), 419-426 (Jul 01, 1967) (8 pages) doi:10.1115/1.3616708 History: Received August 01, 1966; Online August 25, 2011


An energy method is used to investigate a flutter instability of turbojet engine rotors which is caused by the interactions between unsteady air loading and the coupled vibration modes of the rotating blade-disk-shroud system. It is shown, analytically, in this parametric study that under certain circumstances the coupling between blade modes permits the transfer of energy from the air to the blade-disk-shroud system, giving rise to a self-excited instability. Both unsteady potential flow theory and empirical data for oscillating airfoils at high incidence are used.

Copyright © 1967 by ASME
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