US5138841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engines
Assignee: Department of Industry, Science and Resources
•
Filing: 1990-05-02
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Granted: 1992-08-18
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Expires: 2010-05-02
Abstract
Abstract A modified Allison T56 turbo prop engine having reduced smoke emission and improved fuel economy. The air inlet apertures in primary combustion zone of the combustion liners are enlarged and shaped to allow more air to enter the combustion zone.
Inventors
- 👤 Francis W. Skidmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:11
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/04; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
An Allison T56 single spool gas turbine engine, comprising: a can-annular combustion system having a plurality of combustion liners, said combustion liners including primary, secondary and dilution zones having apertured air inlets, said primary zones having cooling corrugations; and air inlet apertures having inwardly extending flanges with diameters of 9 to 15 mm located in said primary zones of said combustion liners, with outer edges of said air inlet apertures being between 0.5 mm and 1.00 mm forward of said cooling corrugations in said primary zones; whereby smoke emissions and fuel consumption are reduced.
Claim 2
Dependent Claim
94 words
An Allison T56 single spool gas turbine engine, comprising: a can-annular combustion system having a plurality of combustion liners, said combustion liners including primary, secondary and dilution zones having apertured air inlets, said primary zones having cooling corrugations; and air inlet apertures having inwardly extending flanges with diameters of 9 to 15 mm located in said primary zones of said combustion liners, with outer edges of said air inlet apertures being between 0.5 mm and 1.00 mm forward of said cooling corrugations in said primary zones; whereby smoke emissions and fuel consumption are reduced.
Claim 3
Dependent Claim
25 words
An Allison T56 single spool gas turbine engine according to claim 1 wherein said air inlet apertures in each of said primary zones number seven.
References Cited (Backward Citations)
US3643430A
Cited
US4301657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-18 | 1996-02-17 | 1996-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-18 | 2000-02-17 | 2000-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-18 | 2004-02-17 | 2004-08-18 | $7700.00 | Window Closed / Lapsed |