Fluid reaction surfaces (i.e. – impellers) – With means moving working fluid deflecting working member... – Cyclic movement of member or part
Patent
1994-05-31
1996-12-31
Kwon, John
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
055888003
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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Charles Bruce D.
Hassan Ahmed A.
JanakiRam Ram D.
Sankar Lakshmi N.
Tadghighi Hormoz
Kwon John
McDonnell Douglas Helicopter Co.
Stout Donald E.
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