Blade vortex interaction noise reduction techniques for a rotorc

Details Blade vortex interaction noise reduction techniques for a rotorc Blade vortex interaction noise reduction techniques for a rotorc

1996-06-13

1998-01-27

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

With means moving working fluid deflecting working member...

Cyclic movement of member or part

244 1713, F01D 500

Patent

active

057116512

ABSTRACT:
An active control device for reducing blade-vortex interactions (BVI) noise generated by a rotorcraft, such as a helicopter, comprises a trailing edge flap located near the tip of each of the rotorcraft's rotor blades. The flap may be actuated in any conventional way, and is scheduled to be actuated to a deflected position during rotation of the rotor blade through predetermined regions of the rotor azimuth, and is further scheduled to be actuated to a retracted position through the remaining regions of the rotor azimuth. Through the careful azimuth-dependent deployment and retraction of the flap over the rotor disk, blade tip vortices which are the primary source for BVI noise are (a) made weaker and (b) pushed farther away from the rotor disk (that is, larger blade-vortex separation distances are achieved).

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