Patent US4081957A successfully refreshed from Google Patents.
US4081957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Premixed combustor
Assignee: RTX Corp
•
Filing: 1976-05-03
•
Granted: 1978-04-04
•
Expires: 1996-05-03
Abstract
Abstract A combustion system for a gas turbine engine is disclosed. Fluid transfer and premixing techniques are developed. The combustion system is specifically adapted, in one embodiment, to an engine having a centrifugal or an axial/centrifugal compressor including a pipe diffuser at the downstream end thereof. Flow transfer tubes are shown between the pipe diffuser and a radial inflow combustor.
Inventors
- 👤 George Benjamin Cox, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:09
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/04; F23R3/10; F23R3/12; F23R3/14; F23R3/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A combustion system for a gas turbine engine of the type having a pipe diffuser including incorporated therein an outwardly oriented diffusion passage, the system comprising: a radial inflow, annular combustor having a first annular region through which the working medium gases are flowable in the radially inward direction, a flow swirler positioned at the outer circumference of the first annular region and through which a portion of the medium gases are flowable into the combustor, and a second annular region, extending axially rearward from the first annular region, through which working medium gases are flowable; and a flow transfer tube which communicatively joins said outwardly oriented diffusion passage to said flow swirler and through which a portion of the working medium gases is flowable to the combustor.
Claim 2
Dependent Claim
128 words
A combustion system for a gas turbine engine of the type having a pipe diffuser including incorporated therein an outwardly oriented diffusion passage, the system comprising: a radial inflow, annular combustor having a first annular region through which the working medium gases are flowable in the radially inward direction, a flow swirler positioned at the outer circumference of the first annular region and through which a portion of the medium gases are flowable into the combustor, and a second annular region, extending axially rearward from the first annular region, through which working medium gases are flowable; and a flow transfer tube which communicatively joins said outwardly oriented diffusion passage to said flow swirler and through which a portion of the working medium gases is flowable to the combustor.
Claim 3
Dependent Claim
42 words
The invention according to claim 1 which further includes, fuel premixing means disposed within said transfer tube at a remote location from said swirler so as to encourage substantial premixing of the fuel with the medium gases flowing through said transfer tube.
Claim 4
Dependent Claim
66 words
The invention according to claim 2 wherein said fuel premixing means comprises: a shroud having an essentially cylindrical geometry and including an aerodynamic lip circumferentially extending about the inner wall thereof forming a sheltered region downstream of the lip; and fuel passages disposed within said shroud, fuel being flowable to the sheltered region for atomization with air flowing through said shroud during operation of the engine.
Claim 5
Dependent Claim
42 words
The invention according to claim 3 wherein said transfer tube is oriented obliquely to said radial combustor so as to promote transverse mixing of the medium discharged from said tube during operation of the engine with the medium contained within the combustor.
Claim 6
Dependent Claim
35 words
The invention according to claim 4 wherein said transfer tube is aligned with the direction of discharge of medium gases from said diffusion passage so as to conserve the angular momentum of the discharging gases.
References Cited (Backward Citations)
US2567079A
Cited
GB615680A
Cited
GB619232A
Cited
FR1007743A
Cited
US2920449A
Cited
US3238718A
Cited
US3283502A
Cited
US3584791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |