US4040578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor vortex control
Assignee: Individual
•
Filing: 1976-02-02
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Granted: 1977-08-09
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Expires: 1996-02-02
Abstract
Abstract This invention is for rotating machines of all types such as helicopters, propellers, compressors, to be equipped with slotted tube or a tube with series of holes extending outwardly in the spanwise direction near the trailing edge of a jet-circulation-control rotor-blade tip for blowing jets of fluid in the direction opposite to the lift of the blade. Thereby achieving flow in the form of a jet sheet to abate, diffuse the undesirable blade-tip vortices and to increase the overall efficiency of the machine.
Inventors
- 👤 Shao Wen Yuan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:37
CPC Classifications
B; B64; B64C; B64C23/00; B64C23/06; B64C23/065; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
Apparatus for abating jet-circulation-control helicopter rotor-blade tip vortices formed at the tip of a blade when it is in fluid stream flowing relative to said blade, said vortex being formed as a result of a difference in fluid pressure on one side of the blade relative to the fluid pressure on the opposite side of the blade which causes a rush flow of fluid from the side of higher pressure to the side of lower pressure, said apparatus comprising a jet-circulation-control rotor blade system having at least a pair of blade tips, a source of pressurized fluid, a plurality of jetting means, and means connecting said jetting means to said source of pressurized fluid, each of said plurality of jetting means being located outwardly of a respective one of the said tips for emitting pressurized fluid from said jetting means in the direction toward said side of higher pressure and in a plane substantially perpendicular to the direction of flow of said fluid stream.
Claim 2
Dependent Claim
164 words
Apparatus for abating jet-circulation-control helicopter rotor-blade tip vortices formed at the tip of a blade when it is in fluid stream flowing relative to said blade, said vortex being formed as a result of a difference in fluid pressure on one side of the blade relative to the fluid pressure on the opposite side of the blade which causes a rush flow of fluid from the side of higher pressure to the side of lower pressure, said apparatus comprising a jet-circulation-control rotor blade system having at least a pair of blade tips, a source of pressurized fluid, a plurality of jetting means, and means connecting said jetting means to said source of pressurized fluid, each of said plurality of jetting means being located outwardly of a respective one of the said tips for emitting pressurized fluid from said jetting means in the direction toward said side of higher pressure and in a plane substantially perpendicular to the direction of flow of said fluid stream.
Claim 3
Dependent Claim
102 words
The structure according to claim 1 wherein said jetting means comprising a hollow post means for supplying fluid under pressure through the post, hollow blade means having an inner post adjacent portion and a tip mounted for rotating on said post, a fluid conveying conduit extending from the post to said blade means at a root portion thereof, said conduit mounted in the blade means and extending spanwise thereof, vortex jet tubes having jet nozzles therein opening into the air stream below said vortex jet tubes to greatly reduced blade tip vortices, and means connecting the conduit to the vortex jet tubes.
Claim 4
Dependent Claim
30 words
The structure according to claim 2 together with means for cyclically controlling the pressurized fluid to said jet vortex tubes with respect to the periodic movement of the said blades.
Claim 5
Dependent Claim
43 words
The structure according to claim 2 together with means for cyclically controlling the pressurized fluid to said jet tubes in the blade for jet stream producing means along one edge of the said blades with respect to periodic movement of the rotor blades.
Claim 6
Dependent Claim
41 words
Apparatus as defined in claim 1 wherein said blade tips include a round leading edge and a round trailing edge, and jet stream producing means in at least one of the edges for controlling the circulation and further increasing the lift.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |