Rotary kinetic fluid motors or pumps – Selectively adjustable vane or working fluid control means – Upstream of runner
Patent
1994-05-23
1995-10-24
Look, Edward K.
Rotary kinetic fluid motors or pumps
Selectively adjustable vane or working fluid control means
Upstream of runner
415162, 415163, F04D 2966
Patent
active
054604842
ABSTRACT:
The invention relates to a compressor provided with an impeller having a rotating shaft for the purpose of compressing air, and an air inlet having a circular cross-section centered on the rotating shaft so as to provide air for the impeller. Further provided are a plurality of movable vanes respectively pivoted in the inlet near the outer circumference of the circular cross-section, a mechanism for tilting these vanes, and a mechanism for causing a specific movable vane to project further downstream than the other movable vanes. When a circular flow is set up in the air inlet by the movable vanes, Karman vortices are produced from the rear ends of the vanes, and when the phases of these vortices combine together, noise is generated. A specific movable vane, the rear end of which projects further downstream than those of the other vanes, disrupts and interferes with the phase combination of the Karman vortices produced by the other vanes, and thereby prevents noise. As the specific vane tilts in the same direction as the other vanes, the vanes do not mutually interfere, consequently the vanes may be positioned at any desired interval apart. The tilt limits and direction may be freely set.
REFERENCES:
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patent: 4436481 (1984-03-01), Linder
patent: 4439104 (1984-03-01), Edmonds
patent: 4451356 (1985-07-01), Linder
patent: 4844695 (1989-07-01), Banks et al.
patent: 4877370 (1989-10-01), Nakagawa et al.
patent: 5165849 (1992-11-01), Nakagawa et al.
Advanced Gas Turbine (AGT) Technology Development Project, Phoenix, Ariz., Dec. 1987.
Lee Michael S.
Look Edward K.
Nissan Motor Co,. Ltd.
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