US3834627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat air-blast fuel injector
Assignee: Avco Corp
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Filing: 1973-04-02
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Granted: 1974-09-10
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Expires: 1993-04-02
Abstract
Abstract A fuel injector comprises a duct receiving pressurized air and having an elongated slot as a closed flared end. A fuel distribution manifold is positioned within the conduit adjacent the slot and has a series of spaced discharge ports for directing fuel out of the manifold. A momentum balance is achieved between fuel which enters the manifold at one end and air entering at the other end of the manifold to provide discharge of fuel from a varying numbr of openings. This automatically provides a uniformly distributed fuel/air mixture for given levels of fuel flow irrespective of variations in air density. The injector is also provided in annular form for use in an annular combustor of a gas turbine engine.
Inventors
- 👤 S Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:46
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/28; F05; F05B; F05B2200/00; F05B2200/10; F05B2200/15
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 words
An air-blast fuel injector for use with a source of pressurized air, said injector comprising: a concave wall open to said source of pressurized air and having at least one elongated slot opening the concave portion of said wall to a lower pressure region; an elongated distribution manifold positioned within the concave portion of said wall and oriented to lie along and adjacent to said slot, said manifold having a plurality of spaced openings adjacent said slot; means for connecting one end of said manifold to air adjacent the concave portion of said wall; and means for maintaining fuel pressure at the opposite end of said manifold at a level permitting the air and fuel in said manifold to achieve a momentum balance at some point therein, thereby causing fuel to be discharged out of said manifold and through the slot to said lower pressure region only from the openings between said point and the opposite end of said manifold.
Claim 2
Dependent Claim
160 words
An air-blast fuel injector for use with a source of pressurized air, said injector comprising: a concave wall open to said source of pressurized air and having at least one elongated slot opening the concave portion of said wall to a lower pressure region; an elongated distribution manifold positioned within the concave portion of said wall and oriented to lie along and adjacent to said slot, said manifold having a plurality of spaced openings adjacent said slot; means for connecting one end of said manifold to air adjacent the concave portion of said wall; and means for maintaining fuel pressure at the opposite end of said manifold at a level permitting the air and fuel in said manifold to achieve a momentum balance at some point therein, thereby causing fuel to be discharged out of said manifold and through the slot to said lower pressure region only from the openings between said point and the opposite end of said manifold.
Claim 3
Dependent Claim
29 words
Apparatus as in claim 1 wherein said fuel pressure maintaining means comprises an orifice positioned at said opposite end of the manifold for reducing fuel pressure to said level.
Claim 4
Dependent Claim
47 words
Apparatus as in claim 1 further comprising a conduit extending from said concave wall and containing said pressurized air and wherein said air connecting means comprises a conduit means extending from said one end of the manifold to a point in said conduit upstream of said manifold.
Claim 5
Dependent Claim
49 words
Apparatus as in claim 1 wherein said openings in said distribution manifold are in sets directed approximately 180* from one another so that fuel discharged from said sets of slots flows in the form of separate streams around said distribution manifold to impinge on one another at said slot.
Claim 6
Dependent Claim
66 words
Apparatus as in claim 4 further comprising a conduit extending from said concave wall and containing said pressurized air and wherein: said fuel pressure maintaining means comprises an orifice interposed in said manifold at said opposite end for reducing fuel pressure; said connecting means comprises a connecting conduit extending from said one end of said manifold to a point in said conduit upstream of said manifold.
Claim 7
Dependent Claim
32 words
Apparatus as in claim 1 wherein the outer surface of said distribution manifold has necked-down sections adjacent both ends of said slot, thereby increasing the airflow into said slot at its ends.
Claim 8
Dependent Claim
47 words
Apparatus as in claim 1 wherein: said fuel distribution manifold is curved along its longitudinal axis; and said concave wall is curved to conform to the shape of said fuel distribution manifold, said elongated slot also being curved to conform to the curvature of said distribution manifold.
Claim 9
Dependent Claim
23 words
Apparatus as in claim 7 wherein said fuel pressure maintaining means comprises an orifice at said opposite end of said curved distribution manifold.
Claim 10
Dependent Claim
32 words
Apparatus as in claim 8 wherein the outer surface of said distribution manifold has necked-down portions adjacent both ends of said slot, thereby increasing the airflow through said slot at that point.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |