Patent US3898797A successfully refreshed from Google Patents.
US3898797A
Expired / Lapsed
US
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Cooling arrangements for duct walls
Assignee: Rolls Royce PLC
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Filing: 1974-07-30
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Granted: 1975-08-12
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Expires: 1994-07-30
Abstract
Abstract A wall structure, particularly for gas turbine engines combustion chambers, in which two vortices of opposite hard impinge on the wall and cooling films of opposite direction are required to be set up from the plane lying between the two vortices. The invention provides two rows of oppositely facing pockets having interdigitaded mouths which generate the two cooling films.
Inventors
- 👤 Robert David Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:03
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/04; F23R3/10; F23R3/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
207 words
A wall structure for a hot duct which duct in use contains or conducts hot fluid and which has a cool fluid on the exterior thereof, the wall structure comprising a wall member, means formed on the inside of the wall member and defining first and second pluralities of discrete pockets, the wall member having at least one aperture for each pocket communicating said pocket with the exterior of the wall member to enable the introduction of the cool fluid into said pocket, each pocket having a mouth for discharging the introduced cool fluid, each mouth of the first plurality of discrete pockets being arranged to discharge said cool fluid substantially in a first direction along the interior of the wall to form a cooling film thereon, each mouth of the second plurality of discrete pockets being arranged to discharge said cool fluid substantially in a second direction along the interior of a wall to form a cooling film thereon, wherein said first and second directions are substantially mutually opposed and the mouths of the first plurality of discrete pockets are interdigitated with the mouths of the second plurality of discrete pockets so that substantially each mouth discharges cool fluid between two mouths of the other plurality.
Claim 2
Dependent Claim
207 words
A wall structure for a hot duct which duct in use contains or conducts hot fluid and which has a cool fluid on the exterior thereof, the wall structure comprising a wall member, means formed on the inside of the wall member and defining first and second pluralities of discrete pockets, the wall member having at least one aperture for each pocket communicating said pocket with the exterior of the wall member to enable the introduction of the cool fluid into said pocket, each pocket having a mouth for discharging the introduced cool fluid, each mouth of the first plurality of discrete pockets being arranged to discharge said cool fluid substantially in a first direction along the interior of the wall to form a cooling film thereon, each mouth of the second plurality of discrete pockets being arranged to discharge said cool fluid substantially in a second direction along the interior of a wall to form a cooling film thereon, wherein said first and second directions are substantially mutually opposed and the mouths of the first plurality of discrete pockets are interdigitated with the mouths of the second plurality of discrete pockets so that substantially each mouth discharges cool fluid between two mouths of the other plurality.
Claim 3
Dependent Claim
88 words
A wall structure according to claim 1, wherein the wall member and said mouths are so disposed that the cool fluid issuing from the mouths of the first plurality of discrete pockets forms a cooling film on the inside of the wall member extending in the first direction downstream of said mouths, and that the cool fluid issuing from the mouths of the second plurality of discrete pockets forms a cooling film on the inside of the wall member extEnding in the second direction downstream of said mouths.
Claim 4
Dependent Claim
32 words
A wall structure according to claim 2, comprising a single strip of material secured to the wall member and formed to define with the wall member both said pluralities of discrete pockets.
Claim 5
Dependent Claim
221 words
A wall structure according to claim 3 comprising a first extension of said strip extending in the first direction downstream of the mouths of said first plurality of discrete pockets, said strip having a first portion spaced from the wall member to form a first continuous recess having an open end facing in said first direction, said recess being in communication with the exterior of the wall, whereby the film of cool fluid from said first plurality of discrete pockets passes over said first extension of the cooling strip and cool fluid from said first continuous recess is joined therewith to enhance the cooling film formed on the inside of the wall member, and also comprising a second extension of said strip extending in the second direction downstream of the mouths of said second plurality of discrete pockets, said strip having a second portion spaced from the wall member to form a second continuous recess having an open end facing in said second direction, said recess being in communication with the exterior of the wall, whereby the film of cool fluid from said second plurality of discrete pockets passes over said second extension of the cooling strip and cool fluid from said second continuous recess is joined therewith to enhance the cooling film formed on the inside of the wall member.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |