US3899876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame tube for a gas turbine combustion equipment
Assignee: UK Secretary of State for Defence
•
Filing: 1969-11-13
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Granted: 1975-08-19
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Expires: 1989-11-13
Abstract
Abstract A flame tube for gas turbine combustion equipment includes at least one wall of double-skinned construction having internal and external skins throughout the major part of its longitudinal and peripheral extent, the internal skin comprising a plurality of axially consecutive peripherally extending sections attached to the external skin at their upstream ends only and being spaced from the external skin to define respective passages therebetween, each section except the most downstream section extending downstream to the upstream end of the next section, the external skin being apertured to direct in operation jets of cooling air onto the internal skin sections for impingement cooling thereof, said cooling air thereafter flowing through said passages.
Inventors
- 👤 Douglas H Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:26
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/002; F23R3/02; F23R3/04; F23R3/06; F23R3/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
A flame tube for gas turbine combustion equipment, the flame tube including at least one wall of double-skinned construction having internal and external skins throughout the major part of its longitudinal and peripheral extent, the internal skin comprising a plurality of axially consecutive peripherally extending sections, means attaching each section by its upstream end only to the external skin, each section being spaced from the external skin to define respective passages therebetween, each section except the most downstream section extending downstream to the upstream end of the next section, the external skin having apertures therein, said apertures directing jets of cooling air onto the internal skin sections for impingement cooling thereof, the passages accommodating a flow of said cooling air which has cooled the internal skin sections.
Claim 2
Dependent Claim
127 words
A flame tube for gas turbine combustion equipment, the flame tube including at least one wall of double-skinned construction having internal and external skins throughout the major part of its longitudinal and peripheral extent, the internal skin comprising a plurality of axially consecutive peripherally extending sections, means attaching each section by its upstream end only to the external skin, each section being spaced from the external skin to define respective passages therebetween, each section except the most downstream section extending downstream to the upstream end of the next section, the external skin having apertures therein, said apertures directing jets of cooling air onto the internal skin sections for impingement cooling thereof, the passages accommodating a flow of said cooling air which has cooled the internal skin sections.
Claim 3
Dependent Claim
47 words
A flame tube as claimed in claim 1 wherein the internal skin sections and the external skin define openings at the downstream ends of said passages, said openings directing said flow of cooling air across the internal surface of the flame tube wall, effecting film cooling thereof.
Claim 4
Dependent Claim
47 words
A flame tube as claimed in claim 1 comprising spacers maintaining downstream ends of the said sections of internal skin spaced from the external skin while permitting sliding movement of said downstream ends relative to the external skin and relative to the other sections of internal skin.
Claim 5
Dependent Claim
42 words
A flame tube as claimed in claim 3 wherein each spacer is peripherally substantially coextensive with a respective internal skin section, said respective internal skin section supporting the spacer coextensive therewith, the spacers having apertures therein permitting said flow of cooling air.
Claim 6
Dependent Claim
34 words
A flame tube as claimed in claim 3 wherein the spacers comprise for each said section a plurality of angularly spaced apart protuberances on a said skin which project towards the other said skin.
Claim 7
Dependent Claim
45 words
A flame tube as claimed in claim 5 wherein the protuberances are blisters on the sections of internal skin, the sections of internal skin having apertures permitting the flow of cooling air in the said passage to pass both internally and externally of the blisters.
Claim 8
Dependent Claim
24 words
A flame tube as claimed in claim 1 wherein the inner skin is made of a porous material for effusion or transpiration cooling thereof.
Claim 9
Dependent Claim
69 words
A flame tube as claimed in claim 1 wherein the external skin comprises a plurality of axially consecutive rings, a downstream ring being of diameter such that it is disposed outwardly, with respect to the interior of the flame tube, of an immediately upstream ring, a said internal skin section being axially aligned with the downstream ring, and having means attaching it only to the said immediately upstream ring.
Claim 10
Dependent Claim
89 words
A flame tube as claimed in claim 1 wherein the external skin comprises a plurality of axially spaced rings each integrally formed and bifurcated at its downstream end to provide a respective pair of radially spaced axially extending annular flanges, means attaching the outer flange relative to the interior of the flame tube, of at least one ring, to the upstream end of the next downstream ring, and means attaching the other flange of the at least one ring to the upstream end of a said internal skin section.
Claim 11
Dependent Claim
37 words
A flame tUbe as claimed in claim 1 comprising radially extending flanges at the upstream end of the flame tube which are adapted to support fuel injector means, said flanges being provided with a downstream-facing heat shield.
Claim 12
Dependent Claim
26 words
A flame tube as claimed in claim 1 and provided at its downstream end with a discharge nozzle of double-skinned construction having internal and external skins.
Claim 13
Dependent Claim
58 words
A flame tube as claimed in claim 11 wherein the discharge nozzle has apertures to permit cooling air to pass in an upstream direction between the internal and external skins of the discharge nozzle, effecting cooling thereof, and means to thereafter direct said cooling air downstream across the internal surface of the discharge nozzle wall, effecting cooling thereof.
Claim 14
Dependent Claim
43 words
A flame tube as claimed in claim 11 comprising a spigot connection between the flame tube and the discharge nozzle, the most downstream internal skin section of the flame tube wall overlapping said connection, shielding it from the interior of the flame tube.
Claim 15
Dependent Claim
137 words
A gas turbine comprising in flow series compressor means, combustion equipment and turbine means, the combustion equipment comprising a flame tube including at least one wall of double-skinned construction having internal and external skins throughout the major part of its longitudinal and peripheral extent, the internal skin comprising a plurality of axially consecutive peripherally extending sections, means attaching each section by its upstream end only to the external skin, each section being spaced from the external skin to define respective passages therebetween, each section except the most downstream section extending downstream to the upstream end of the next section, the external skin having apertures therein, said apertures directing jets of cooling air onto the internal skin sections for impingement cooling thereof, the passages accommodating a flow of said cooling air which has cooled the internal skin sections.
Claim 16
Dependent Claim
137 words
A gas turbine comprising in flow series compressor means, combustion equipment and turbine means, the combustion equipment comprising a flame tube including at least one wall of double-skinned construction having internal and external skins throughout the major part of its longitudinal and peripheral extent, the internal skin comprising a plurality of axially consecutive peripherally extending sections, means attaching each section by its upstream end only to the external skin, each section being spaced from the external skin to define respective passages therebetween, each section except the most downstream section extending downstream to the upstream end of the next section, the external skin having apertures therein, said apertures directing jets of cooling air onto the internal skin sections for impingement cooling thereof, the passages accommodating a flow of said cooling air which has cooled the internal skin sections.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |