COUPLED BENDING-BENDING-TORSION FLUTTER OF A MISTUNED CASCADE WITH NONUNIFORM BLADES.

A SET OF AEROELASTIC EQUATIONS DESCRIBING THE MOTION OF AN ARBITRARILY MISTUNED CASCADE WITH FLEXIBLE, PRETWISTED, NONUNIFORM BLADES IS DEVELOPED USING AN EXTENDED HAMILTON'S PRINCIPLE. A GENERAL EXPRESSION FOR FORESHORTENING OF A BLADE ISDERIVED AND IS EXPLICITLY USED IN THE FORMULATION. THE BLADE AERODYNAMIC LOADING IN THE SUBSONIC AND SUPERSONIC FLOW REGIMES IS OBTAINED FROM TWO-DIMENSIONAL, UNSTEADY, CASCADE THEORIES. THE AERODYNAMIC, INERTIAL AND STRUCTURAL COUPLING BETWEEN THE BENDING (IN TWO PLANES) AND TORSIONAL MOTIONS OF THE BLADE IS INCLUDED. THE EQUATIONS ARE USED TO INVESTIGATE THE AEROELASTIC STABILITY AND TO QUANTIFY THE EFFECT OF FREQUENCY MISTUNING ON FLUTTER IN TURBOFANS.

Duke Scholars

Author Robert Kielb Thomas Lord Department of Mechanical Engineering and Materia ...