US3921391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustor wing vortex generators
Assignee: United States Department of the Navy
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Filing: 1972-04-13
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Granted: 1975-11-25
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Expires: 1992-04-13
Abstract
Abstract A combustor of a ramjet engine having a plurality of wings of aerofoil cross-section extending inwardly from the combustor wall at the air inlet and in advance of the pilot flame. The wings are of finite aspect ratio and are pitched to an angle of attack to generate a vortex downstream of the pilot flame.
Inventors
- 👤 Patrick H Hall
- 👤 David W Oliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:23
CPC Classifications
F; F02; F02K; F02K7/00; F02K7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A vortex generator in a combustor for a ramjet type engine comprising: a hollow cylindrical chamber of substantial wall thickness having an opening completely across its inner diameter for allowing airflow in an axial direction through said chamber; a flame front; flameholder means positioned within said chamber a substantial distance from said opening for creating said flame front; a plurality of spaced solid wings of airfoil cross section positioned upstream of said flameholder, each of said wings projecting from said chamber wall at right angles to the longitudinal axis of said chamber with the free ends of each of said wings extending to a position adjacent each other near the center of said chamber and having the cordwise dimension of each of said wings slanted with respect to axial airflow through said chamber; whereby airflow through said chamber is caused to eddy downstream of the trailing edges of the wings to actively and rapidly mix the air with the area of said flameholder.
Claim 2
Dependent Claim
163 words
A vortex generator in a combustor for a ramjet type engine comprising: a hollow cylindrical chamber of substantial wall thickness having an opening completely across its inner diameter for allowing airflow in an axial direction through said chamber; a flame front; flameholder means positioned within said chamber a substantial distance from said opening for creating said flame front; a plurality of spaced solid wings of airfoil cross section positioned upstream of said flameholder, each of said wings projecting from said chamber wall at right angles to the longitudinal axis of said chamber with the free ends of each of said wings extending to a position adjacent each other near the center of said chamber and having the cordwise dimension of each of said wings slanted with respect to axial airflow through said chamber; whereby airflow through said chamber is caused to eddy downstream of the trailing edges of the wings to actively and rapidly mix the air with the area of said flameholder.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |