Fluid reaction surfaces (i.e. – impellers) – With fluid passage in working member communicating with... – Air and watercraft propellers
Patent
1996-09-10
1998-08-11
Kwon, John
Fluid reaction surfaces (i.e., impellers)
With fluid passage in working member communicating with...
Air and watercraft propellers
244199, F04D 2938
Patent
active
057918759
ABSTRACT:
An active control device is disclosed for modifying a tip vortex on a lifting body. The lifting body includes a positive-pressure generating structure and a negative-pressure generating structure, and is adapted for providing lift when a first fluid pressure adjacent to the positive-pressure generating structure is greater than a second fluid pressure adjacent to the negative-pressure generating structure. The active control device includes a fluid source adapted for providing a positive pressure of fluid, such as air, to an interior of the lifting body. The active control device further includes a fluid router, which is disposed on the lifting body and which is adapted for directing a portion of the positive pressure of fluid out of the interior of the lifting body and in a general direction from the fluid router toward the positive-pressure generating structure of the lifting body. The lifting body may be either a rotorcraft blade, an aircraft foil, or a marine foil such as a marine propeller.
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Kwon John
McDonnell Douglas Helicopter Co.
Mullins Kenton R.
Stout Donald E.
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