Aerodynamic damping of vibrations in rotor blades

Details Aerodynamic damping of vibrations in rotor blades Aerodynamic damping of vibrations in rotor blades

1985-02-14

1985-07-30

Croyle, Carlton R.

Power plants

Reaction motor

Interrelated reaction motors

415119, 416500, F01D 526

Patent

active

045313628

ABSTRACT:
In order to combat flutter in rotor blades rotating within a duct bounded by a duct wall, the duct wall incorporates cavities tuned for resonance to a known flutter frequency. The cavities, which may comprise tubes immediately underlying a facing sheet of the duct wall, are arrayed around the circumference of the duct wall and communicate with the duct through openings in the duct wall near the tips of the blades. Flutter energy from the blades is transferred directly to the cavities by pressure waves and produces resonance in the cavities so that the flutter is damped aerodynamically. The invention is applicable to fans in turbofan engines.

REFERENCES:
patent: 2225398 (1940-12-01), Hambun
patent: 3819009 (1974-06-01), Motsinger
patent: 4106587 (1978-08-01), Nash et al.
patent: 4122672 (1978-10-01), Lowrie
patent: 4135603 (1979-01-01), Dean, III et al.
patent: 4150732 (1979-04-01), Hoch et al.
patent: 4231447 (1980-11-01), Chapman
patent: 4298090 (1981-11-01), Chapman

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