Fluid reaction surfaces (i.e. – impellers) – Unsymmetrical impeller or dissimilar working members
Patent
1998-04-08
2000-03-28
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Unsymmetrical impeller or dissimilar working members
416175, 416500, 29889, F01D 510
Patent
active
060423382
ABSTRACT:
A propulsion engine fan incorporates two sets of blades with recessed portions formed along the surface of each blade. One set of blades has a higher resonant frequency than the other set of blades. In an illustrative embodiment of the invention, first and second blade groups each comprise an airfoil portion forming a surface for directing the flow of a working fluid through the engine. Each of the first group of blades has first and second recessed regions formed from the blade surface and has a first resonant frequency. Each of the second group of blades has third and fourth recessed regions formed from the blade surface and has a second resonant frequency less than the first resonant frequency. The first and second group blades are arranged in an alternating pattern along the rotor portion of the fan.
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Brafford Perry W.
Gebre-Giorgis Yoseph
Murthy Durbha V.
Allied-Signal Inc.
Barton Rhonda
Desmond, Esq. Robert
Look Edward K.
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