Vortex control for rotor blade devices

Details Vortex control for rotor blade devices Vortex control for rotor blade devices

2005-09-22

2008-12-23

Kershteyn, Igor (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Method of operation

C416S023000

Reexamination Certificate

active

07467921

ABSTRACT:
To control vortices originating at the tips of a rotor's blades rotating through the air at a revolution frequency f, separation control device(s) are actuated to periodically introduce perturbations into the airflow moving over the blades. The periodic introduction of perturbations is controlled in accordance with a periodic modulating frequency of introduction f0while the frequency of the perturbations so-introduced is designated as fe. Vortex control is achieved when the periodic modulating frequency of introduction f0satisfies the relationshipin-line-formulae description="In-line Formulae" end="lead"?nf≦f0≦fein-line-formulae description="In-line Formulae" end="tail"?where n is the number of blades.

REFERENCES:
patent: 6171056 (2001-01-01), Lorber
patent: 6461106 (2002-10-01), Rahier
patent: 6474945 (2002-11-01), Nakasato et al.
patent: 6478541 (2002-11-01), Charles et al.

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