US3737152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling of hot fluid ducts
Assignee: UK Secretary of State for Defence
•
Filing: 1972-01-17
•
Granted: 1973-06-05
•
Expires: 1992-01-17
Abstract
Abstract A cooling ring for a gas turbine engine flame tube connects upstream and downstream wall sections, and includes a conical intermediate portion drilled with a large number of holes having diameters of the order of 0.010 ins. to 0.020 ins. through which cooling air passes to produce a cooling film over the hot surface of the flame tube.
Inventors
- 👤 J Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:23
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/04; F23R3/06; F23R3/08; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A duct comprising coaxial upstream and downstream wall sections which lie at different distances from the longitudinaL axis of the duct and a cooling section through which a cooling fluid can be passed to form a film over one of the surfaces of the duct, the cooling section having end portions connected to said wall sections and an intermediate portion which is provided with means defining at least three spaced rows of holes therethrough, each hole in any one row being staggered with respect to the holes in an adjacent row, the diameter of the holes lying in the range from 0.005 ins. to 0.030 ins.
Claim 2
Dependent Claim
106 words
A duct comprising coaxial upstream and downstream wall sections which lie at different distances from the longitudinaL axis of the duct and a cooling section through which a cooling fluid can be passed to form a film over one of the surfaces of the duct, the cooling section having end portions connected to said wall sections and an intermediate portion which is provided with means defining at least three spaced rows of holes therethrough, each hole in any one row being staggered with respect to the holes in an adjacent row, the diameter of the holes lying in the range from 0.005 ins. to 0.030 ins.
Claim 3
Dependent Claim
37 words
A duct according to claim 1, having a circular cross section and wherein the cooling section is in the form of a ring connecting the upstream and downstream wall sections of the duct which have different diameters.
Claim 4
Dependent Claim
94 words
A duct according to claim 2 and wherein the downstream wall section has a greater diameter than the upstream wall section, and the intermediate portion of the cooling ring is conical and diverges in a downstream direction between the upstream and downstream wall portions, the holes in the intermediate portion of the cooling ring being arranged so that cooling fluid flowing over the radially outer surface of the upstream wall section of the duct passes through the holes to form a film of cooling fluid over the internal surface of the downstream wall section.
Claim 5
Dependent Claim
31 words
A duct according to claim 1 and wherein the centres of any two holes of one row form an equilateral triangle with the centre of a hole from an adjacent row.
Claim 6
Dependent Claim
22 words
A duct according to claim 1 and wherein the diameter of the holes lies in the range 0.010 ins. to 0.020 ins.
References Cited (Backward Citations)
US2548485A
Cited
US3623711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |