Patent US4132499A successfully refreshed from Google Patents.
US4132499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wind driven energy generating device
Assignee: Ben-Gurion University of the Negev
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Filing: 1977-01-25
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Granted: 1979-01-02
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Expires: 1997-01-25
Abstract
Abstract A wind-driven energy-generating device comprises a shroud having a throat within which the rotor blades of a turbine are mounted, an intake section upstream of and having an inner face converging towards the throat, and a diffuser section downstream of and having an inner face diverging away from the throat. To prevent premature air separation along the inner surface of the diffuser section, the device includes boundary layer control means comprising a plurality of air channels leading from an external surface of the shroud to the internal surface of its diffuser section for injecting a flow of air of high kinetic energy from the air stream external of the shroud to the boundary layer of the air stream within the diffuser section of the shroud.
Inventors
- 👤 Ozer Igra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:17
CPC Classifications
F; F15; F15D; F15D1/00; F15D1/02; F15D1/06; F05; F05B; F05B2240/00; F05B2240/10; F05B2240/13; F05B2240/133; F05B2250/00; F05B2250/50; F05B2250/501; F05B2250/5011; Y; Y10; Y10S; Y10S415/00; Y10S415/905; Y10S415/908; Y10S415/914
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
140 words
A wind-driven energy-generating device comprising: a turbine including wind-driven rotor blades; and a shroud enclosing same; said shroud including a throat within which the wind-driven rotor blades are mounted for rotation, an intake section upstream of and having an inner face converging towards the throat, a diffuser section downstream of and having an inner face diverging away from the throat, and boundary layer control means to prevent premature air separation along the inner surface of the diffuser section; said boundary layer control means including a plurality of air channels formed through the shroud leading from an external surface of the shroud to the internal surface of its diffuser section for injecting a flow of air of high kinetic energy from the airstream external of the shroud to the boundary layer of the airstream within the diffuser section of the shroud.
Claim 2
Dependent Claim
140 words
A wind-driven energy-generating device comprising: a turbine including wind-driven rotor blades; and a shroud enclosing same; said shroud including a throat within which the wind-driven rotor blades are mounted for rotation, an intake section upstream of and having an inner face converging towards the throat, a diffuser section downstream of and having an inner face diverging away from the throat, and boundary layer control means to prevent premature air separation along the inner surface of the diffuser section; said boundary layer control means including a plurality of air channels formed through the shroud leading from an external surface of the shroud to the internal surface of its diffuser section for injecting a flow of air of high kinetic energy from the airstream external of the shroud to the boundary layer of the airstream within the diffuser section of the shroud.
Claim 3
Dependent Claim
48 words
A device according to claim 1, wherein said air channels each includes an inlet leading from an external surface of the shroud to an outlet exiting from the inner surface of the diffuser section of the shroud at an acute angle with respect to the longitudinal axis thereof.
Claim 4
Dependent Claim
13 words
A device according to claim 2, wherein said acute angle is approximately 30°.
Claim 5
Dependent Claim
29 words
A device according to claim 2, wherein said outlets are in the form of a plurality of annularly-arrayed axially-spaced openings in the inner surface of the shroud diffuser section.
Claim 6
Dependent Claim
24 words
A device according to claim 2, wherein said air channel inlets are formed through the leading edge of the intake section of the shroud.
Claim 7
Dependent Claim
29 words
A device according to claim 2, wherein said air channel inlets are formed through the outer face of the intake section of the shroud adjacent to its leading edge.
Claim 8
Dependent Claim
58 words
A device according to claim 1, further including a circular wing at the exit end of the shroud diffuser section and coaxial therewith, the circular wing having an inlet end of larger inner diameter than that of the exit end of the diffuser section, and an outlet end of larger inner diameter than that of its inlet end.
Claim 9
Dependent Claim
31 words
A device according to claim 1, further including an aerodynamically-shaped central core fixed within the shroud in the region of its throat and its junctions to the intake and diffuser sections.
Claim 10
Dependent Claim
30 words
A device according to claim 8, further including stator blades between the central core and the intake section of the shroud at the upstream side of the wind-driven rotor blades.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |