Patent US4504192A successfully refreshed from Google Patents.
US4504192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet spoiler arrangement for wind turbine
Assignee: United States, ENGERGY THE, Secretary of, Department of
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Filing: 1983-09-15
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Granted: 1985-03-12
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Expires: 2003-09-15
Abstract
Abstract An air jet spoiler arrangement is provided for a Darrieus-type vertical axis wind-powered turbine. Air is drawn into hollow turbine blades through air inlets at the ends thereof and is ejected in the form of air jets through small holes or openings provided along the lengths of the blades. The air jets create flow separation at the surfaces of the turbine blades, thereby inducing stall conditions and reducing the output power. A feedback control unit senses the power output of the turbine and controls the amount of air drawn into the air inlets accordingly.
Inventors
- 👤 Jack D. Cyrus
- 👤 Emil G. Kadlec
- 👤 Paul C. Klimas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:25
CPC Classifications
F; F03; F03D; F03D15/00; F03D15/05; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
127 words
A vertical-axis wind turbine comprising a rotor assembly and a load powered from said rotor assembly through a drive unit, said rotor assembly comprising: at least one hollow rotor blade having opposed blade surfaces mounted for rotation about a vertical axis, said blade having an air inlet opening at one end located near the axis and a plurality of air outlet aperture means for causing flow separation along a substantial portion of each blade surface between the leading edge and trailing edge of the blade, said outlet aperture means being further from the axis than said inlet opening; whereby air drawn into the inlet opening will flow out of said apertures and interfere with the air flow across the blade, thereby reducing power produced by the turbine.
Claim 2
Dependent Claim
127 words
A vertical-axis wind turbine comprising a rotor assembly and a load powered from said rotor assembly through a drive unit, said rotor assembly comprising: at least one hollow rotor blade having opposed blade surfaces mounted for rotation about a vertical axis, said blade having an air inlet opening at one end located near the axis and a plurality of air outlet aperture means for causing flow separation along a substantial portion of each blade surface between the leading edge and trailing edge of the blade, said outlet aperture means being further from the axis than said inlet opening; whereby air drawn into the inlet opening will flow out of said apertures and interfere with the air flow across the blade, thereby reducing power produced by the turbine.
Claim 3
Dependent Claim
12 words
The turbine of claim 1 wherein said load is an electric generator.
Claim 4
Dependent Claim
26 words
The turbine of claim 2 further comprising control means for controlling opening and closing of the inlet opening to control the power output of the turbine.
Claim 5
Dependent Claim
35 words
The turbine of claim 3 wherein said control means includes means for sensing the power output of the rotor assembly and means for controlling the opening and closing of the inlet opening in accordance therewith.
Claim 6
Dependent Claim
34 words
The turbine of claim 4 wherein said control means includes a moveable plate associated with each inlet opening of each blade for selectively closing that inlet opening under the control of said control means.
Claim 7
Dependent Claim
28 words
The turbine of claim 1 wherein said rotor comprises at least two blades arranged symmetrically around the axis, and each end of each blade contains an inlet opening.
Claim 8
Dependent Claim
28 words
The turbine of claim 6 wherein each opening has an associated control means for controlling opening and closing of the opening to control power output of the turbine.
Claim 9
Dependent Claim
36 words
The turbine of claim 1 wherein each said blade is curved and includes spaced end portions fastened to said axis and a connecting portion spaced from said axis, said blade and axis defining a Darrieus turbine.
Claim 10
Dependent Claim
41 words
The turbine of claim 1 wherein each said aperture means consists of an aperture extending through the blade from the hollow interior thereof to the outer surface thereof, the axis of said aperture being perpendicular to the surface of said blade.
Claim 11
Dependent Claim
18 words
The turbine of claim 5 wherein each control means is mounted to an external surface of a blade.
Claim 12
Dependent Claim
41 words
The turbine of claim 8 wherein each said aperture means consists of an aperture extending through the blade from the hollow interior thereof to the outer surface thereof, the axis of said aperture being perpendicular to the surface of said blade.
Claim 13
Dependent Claim
39 words
The turbine of claim 8 further comprising means for sensing at least one output parameter associated with the rotation of the rotor assembly and a valving system for controlling the air drawn into said air inlets in accordance therewith.
Claim 14
Dependent Claim
42 words
The turbine of claim 12 wherein said parameter is turbine output power and wherein said valving system includes moveable plates relative to the respective air inlets, the positions of said plates being controlled to control the air drawn into the air inlets.
References Cited (Backward Citations)
US1501248A
Cited
FR29498E
Cited
US1786057A
Cited
FR768647A
Cited
US2156133A
Cited
FR905544A
Cited
US2516489A
Cited
US2759548A
Cited
US3547377A
Cited
FR2290585A1
Cited
US4082479A
Cited
US4142822A
Cited
US4197053A
Cited
US4303835A
Cited
US4355955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |