US3905192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustor having staged premixing tubes
Assignee: RTX Corp
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Filing: 1974-08-29
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Granted: 1975-09-16
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Expires: 1994-08-29
Abstract
Abstract A gas turbine engine is shown having an annular burner with a plurality of staged premixing tubes extending from the forward end thereof. Each tube directs flow to the burner through two concentric flow passages. A movable tube section is arranged to direct all the air through both flow passages or just through one passage. Fuel is directed into the staged premixing tube for mixing with air flowing therethrough. Swirl vanes are provided in each of the flow passages to provide for rotation of air passing therethrough. A centerbody is positioned within the inner flow passage providing a bluffbody to promote recirculatory flow in the general region rearwardly of the centerbody. Cooling is provided around the primary zone of the burner so as to provide a minimum of cooling flow into the primary zone.
Inventors
- 👤 Robert M Pierce
- 👤 Philip W Smith
- 👤 Walter R Kaminski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:56
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/42; F23R3/60; F23R3/02; F23R3/26; F23R3/28; F23R3/286; F23R3/30; F23R3/50
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
110 words
In combination, a staged premixing tube for directing a mixed fuel-air flow into a burner, said staged premixing tube having an outer tube for receiving fuel and air, said outer tube having an inner tube located therein adjacent its rear end forming a first inner passage and a second annular passage therearound, said outer tube having a movable tube located therein forwardly of said inner tube, said movable tube being movable between a first position where it directs all of the flow in said outer tube through said first inner passage to a second position where all of the flow is directed through both of said first and second passages.
Claim 2
Dependent Claim
110 words
In combination, a staged premixing tube for directing a mixed fuel-air flow into a burner, said staged premixing tube having an outer tube for receiving fuel and air, said outer tube having an inner tube located therein adjacent its rear end forming a first inner passage and a second annular passage therearound, said outer tube having a movable tube located therein forwardly of said inner tube, said movable tube being movable between a first position where it directs all of the flow in said outer tube through said first inner passage to a second position where all of the flow is directed through both of said first and second passages.
Claim 3
Dependent Claim
98 words
A combination as set forth in claim 1 wherein said outer tube is formed having an inlet connected to a smaller center section by a first inwardly tapered section, the forward end of said inner tube being positioned adjacent said smaller center section, said movable tube being formed having a large forward end with a second inwardly tapered section and a smaller rear end, when said movable tube is in its first position its rear end contacts the forward end of the inner tube while its forward end contacts the first inwardly tapered section of the outer tube.
Claim 4
Dependent Claim
22 words
A combination as set forth in claim 1 wherein a bluffbody is positioned within said first inner passage forming an annular passage.
Claim 5
Dependent Claim
30 words
A combination as set forth in claim 1 wherein first swirl vanes are positioned in said first inner passage and second swirl vanes are positioned in said second annular passage.
Claim 6
Dependent Claim
31 words
A combination as set forth in claim 3 wherein first swirl vanes are positioned in said first inner annular passage and second swirl vanes are positioned in said second annular passage.
Claim 7
Dependent Claim
42 words
A combination as set forth in claim 1 wherein a fuel nozzle means directs fuel into said staged premixing tube, and a compressor directs air into said staged premixing tube, and actuating means are connected to said movable tube for moving it.
Claim 8
Dependent Claim
42 words
A combination as set forth in claim 1 wherein a fuel nozzle means extends into the forward end of said outer tube for directing fuel into the staged premixing tube, said movable tube being mounted for movement on said fuel nozzle means.
Claim 9
Dependent Claim
37 words
A combination as set forth in claim 7 wherein said fuel nozzle means has a cylindrical surface thereon, said actuating means having a sleeve which is axially movable on said cylindrical surface of said fuel nozzle means.
Claim 10
Dependent Claim
130 words
In combination in a gas turbine engine, compressor means, combustion means, turbine means, said combustion means having an annular burner therein, fuel nozzle means, said burner having a plurality of staged Premixing tubes extending from the forward end thereof, each staged premixing tube having an outer tube for receiving fuel and air, each outer tube having an inner tube located therein forming a first inner passage and a second annular passage therearound, each outer tube having a movable tube located therein forwardly of said inner tube, each movable tube being movable between a first position where it directs all of the flow entering its outer tube through the first inner passage to a second position where all of the flow is directed through both of said first and second passages.
Claim 11
Dependent Claim
130 words
In combination in a gas turbine engine, compressor means, combustion means, turbine means, said combustion means having an annular burner therein, fuel nozzle means, said burner having a plurality of staged Premixing tubes extending from the forward end thereof, each staged premixing tube having an outer tube for receiving fuel and air, each outer tube having an inner tube located therein forming a first inner passage and a second annular passage therearound, each outer tube having a movable tube located therein forwardly of said inner tube, each movable tube being movable between a first position where it directs all of the flow entering its outer tube through the first inner passage to a second position where all of the flow is directed through both of said first and second passages.
Claim 12
Dependent Claim
24 words
A combination as set forth in claim 9 wherein said first passage and second passage direct air into said burner with counter-rotating swirling flows.
Claim 13
Dependent Claim
53 words
A combination as set forth in claim 9 wherein said annular burner has a plurality of receptors extending forwardly thereof, each receptor being positioned to receive a staged premixing tube, each premixing tube being positioned in a receptor so that the rear end thereof is positioned adjacent the forward end of the burner.
Claim 14
Dependent Claim
32 words
A combination as set forth in claim 9 wherein means are provided to move all of the movable tubes forwardly from their first position when a predetermined fuel flow setting is reached.
Claim 15
Dependent Claim
30 words
A combination as set forth in claim 9 wherein means are provided to move each movable tube individually from its first position to a second position around the annular burner.
Claim 16
Dependent Claim
25 words
A combination as set forth in claim 13 wherein said movable tubes are moved between their first position and second position sequentially around the burner.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |