Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Plural distributing means immediately upstream of runner
Patent
1997-04-09
1999-10-12
Teska, Kevin J.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Plural distributing means immediately upstream of runner
415119, 416223R, F01D 512, B64C 1118, G06F 1750
Patent
active
059665254
ABSTRACT:
The blades (38) of a gas turbine engine fan rotor (32) are uniquely distributed in the rotor hub (48) so that combination tone noise attributable to one or more physical nonuniformities in the blades is mitigated. The invention recognizes that the frequency spectrum of the combination tone noise includes both decay prone harmonics and decay resistant harmonics and that allocation of acoustic energy into the decay prone harmonics and out of the decay resistant harmonics is effective for mitigating combination tone noise. In particular, the blades are distributed so that the spatial or circumferential spectrum of the physical nonuniformity is dominated by circumferential harmonics whose order is no greater than the order of the highest decay prone harmonic of the combination tone noise spectrum.
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Manzi, Jr. Robert J.
Mathews Douglas C.
Slomski Soter P.
Van Achterberg Johan
Baran Kenneth C.
Jones Hugh
Teska Kevin J.
United Technologies Corporation
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