US3826083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recirculating combustion apparatus jet pump
Assignee: Motors Liquidation Co
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Filing: 1973-07-16
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Granted: 1974-07-30
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Expires: 1993-07-16
Abstract
Abstract A combustion apparatus for a gas turbine engine includes a Coanda effect jet pump by which air introduced for combustion recirculates combustion products into the combustion zone of the apparatus. The jet pump is effective to improve the recirculation ratio while maintaining an acceptably low pressure drop in the combustion apparatus. The combustion air flows through the interior of the body of the Coanda nozzle and over a wall which terminates in a lip converging toward the radial surface of the Coanda nozzle body. A ring of vanes bridges the nozzle and aligns the nozzle walls. The vanes are at an angle to the radial direction to impart swirl to the primary air and improve jet pump performance.
Inventors
- 👤 H Brandon
- 👤 W Spicer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:19
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/02; F23R3/26; Y; Y10; Y10S; Y10S239/00; Y10S239/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
199 words
A combustion apparatus comprising, in combination, an innermost wall defining a combustion zone having upstream and downstream ends, an inner wall defining an annular air passage with the innermost wall, an outer wall defining with the inner wall an annular recirculation passage from the downstream to the upstream end of the combustion zone and defining a discharge passage from the combustion zone, and an outermost wall defining a dilution air passage with the outer wall to conduct air into the discharge passage; the downstream end of the inner wall being curved inwardly and the downstream end of the innermost wall being curved outwardly to define a Coanda nozzle encircling the downstream end of the combustion zone between the said curved ends adapted to discharge into the recirculation passage and entrain combustion products discharged from the combustion zone into the recirculation passage; characterized by a Coanda nozzle structure in which the bounding walls converge radially from the combustor axis toward an annular radial outlet and including a ring of swirl vanes extending between the bounding walls and directed at an angle to the radial direction so as to deliver the air from the nozzle with a circumferential component of velocity.
Claim 2
Dependent Claim
199 words
A combustion apparatus comprising, in combination, an innermost wall defining a combustion zone having upstream and downstream ends, an inner wall defining an annular air passage with the innermost wall, an outer wall defining with the inner wall an annular recirculation passage from the downstream to the upstream end of the combustion zone and defining a discharge passage from the combustion zone, and an outermost wall defining a dilution air passage with the outer wall to conduct air into the discharge passage; the downstream end of the inner wall being curved inwardly and the downstream end of the innermost wall being curved outwardly to define a Coanda nozzle encircling the downstream end of the combustion zone between the said curved ends adapted to discharge into the recirculation passage and entrain combustion products discharged from the combustion zone into the recirculation passage; characterized by a Coanda nozzle structure in which the bounding walls converge radially from the combustor axis toward an annular radial outlet and including a ring of swirl vanes extending between the bounding walls and directed at an angle to the radial direction so as to deliver the air from the nozzle with a circumferential component of velocity.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |