US4529357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine blades
Assignee: Rolls Royce PLC
•
Filing: 1983-12-14
•
Granted: 1985-07-16
•
Expires: 2003-12-14
Abstract
Abstract A hollow turbine blade 10 of aerofoil shaped cross section is provided with walls 18 of varying thicknesses to provide thermal slugging at those regions around the aerofoil profile where the blade experiences high thermal fluxes. The thicker regions of the blade 10 are provided with cooling channels 22 which are elongated in a direction extending from the external surface of the wall towards the internal surface of the wall. The thermal slugging slows down the rate of change of blade wall temperature to a value similar to the rates elsewhere in the blade section. The cooling channels 22 ensure that the temperature gradient across the wall 18 is low around the profile of the aerofoil.
Inventors
- 👤 Maxwell J. Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:51
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; F01D5/181; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A turbine blade of aerofoil shaped cross-section which in use is exposed to thermal fluxes the level of which varies from one region of the blade to another region, the blade having a large central void enclosed by the internal surface of a wall of varying thickness, the wall being thicker at regions which in use are exposed to high fluxes than at those regions which in use are exposed to lower fluxes, the wall being provided with cooling channels located along the wall of the blade, at least the channels at the thicker regions of the wall being separate and elongated in a direction extending substantially perpendicular to the most nearly adjacent external surface of the wall towards said internal surface of the wall, and the elongated channels being provided with a lining which is thermally more conductive than the material from which the blade is made.
Claim 2
Dependent Claim
148 words
A turbine blade of aerofoil shaped cross-section which in use is exposed to thermal fluxes the level of which varies from one region of the blade to another region, the blade having a large central void enclosed by the internal surface of a wall of varying thickness, the wall being thicker at regions which in use are exposed to high fluxes than at those regions which in use are exposed to lower fluxes, the wall being provided with cooling channels located along the wall of the blade, at least the channels at the thicker regions of the wall being separate and elongated in a direction extending substantially perpendicular to the most nearly adjacent external surface of the wall towards said internal surface of the wall, and the elongated channels being provided with a lining which is thermally more conductive than the material from which the blade is made.
Claim 3
Dependent Claim
20 words
A turbine blade according to claim 1 wherein only those channels at the thicker regions of the wall are elongated.
Claim 4
Dependent Claim
47 words
A turbine blade according to claim 1 wherein the channels are adapted for coolant flow therethrough, said channels communicate with the central void of the blade and cooling passages are provided to conduct the coolant from the void to holes in the external surface of the blade.
Claim 5
Dependent Claim
30 words
A turbine blade according to claim 1 wherein said blade has a leading edge region, and said thicker wall regions are provided at the leading edge region of the aerofoil.
Claim 6
Dependent Claim
53 words
A turbine blade according to claim 1 wherein said blade has a root end and a tip; said cooling channels are adapted to have a cooling fluid flow therethrough, and said cooling channels extend from a cavity at the root end of the blade and are open at the tip of the blade.
Claim 7
Dependent Claim
39 words
A turbine blade according to claim 1 wherein the blade has a high pressure side, said high pressure side has a trailing part, and said thicker wall regions are provided at the trailing part of said high pressure side.
References Cited (Backward Citations)
DE715421C
Cited
US2696364A
Cited
CH323718A
Cited
US2991973A
Cited
FR1165132A
Cited
US2894719A
Cited
US3044745A
Cited
US2966331A
Cited
US3066910A
Cited
GB954063A
Cited
US3111302A
Cited
US3420502A
Cited
US3314650A
Cited
DE1476905A1
Cited
GB1257041A
Cited
US3515499A
Cited
US3848307A
Cited
DE2345038A1
Cited
DE2434989A1
Cited
GB1574166A
Cited
US4142831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |