Patent US3747874A successfully refreshed from Google Patents.
US3747874A
Expired / Lapsed
US
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Ejector nozzle having primary nozzles communicating with exhaust gases in plenum chamber
Assignee: Rohr Inc
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Filing: 1971-08-25
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Granted: 1973-07-24
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Expires: 1991-08-25
Abstract
Abstract A jet engine aircraft propulsion mechanism has a plurality of primary nozzles mounted to receive engine exhaust gases from a plenum, and to discharge these gases at high velocity rearwardly into and through an ejector nozzle. Ejector pumping action generated by the flow of the exhaust gases rearwardly through the ejector nozzle draws ambient air into and rearwardly through the ejector nozzle along with the exhaust gases, thereby adding the mass of such air to that of the exhaust gases to increase thrust, provide cooling and reduce noise.
Inventors
- 👤 R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:58
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/36; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
In an aircraft having an engine nacelle and a jet engine mounted therein, propulsion mechanism for optimizing thrust and minimizing noise comprising, a plenum chamber in the nacelle to receive a continuous flow of pressurized exhaust gases from the engine, at least one ejector nozzle mounted on the aircraft with its axis in a fore-and-aft direction and its forward and aft ends open solely to the ambient atmosphere, at least one primary nozzle extending circumferentially of the ejector nozzle and directed to discharge rearwardly into the ejector nozzle through an annular slot provided in the inner surface thereof, and duct means openly communicating the plenum chamber in sealed relation with each primary nozzle for conducting all of the pressurized engine exhaust gases from the plenum chamber to and through said at least one primary nozzle and thence rearwardly along the interior surface of the ejector nozzle.
Claim 2
Dependent Claim
146 words
In an aircraft having an engine nacelle and a jet engine mounted therein, propulsion mechanism for optimizing thrust and minimizing noise comprising, a plenum chamber in the nacelle to receive a continuous flow of pressurized exhaust gases from the engine, at least one ejector nozzle mounted on the aircraft with its axis in a fore-and-aft direction and its forward and aft ends open solely to the ambient atmosphere, at least one primary nozzle extending circumferentially of the ejector nozzle and directed to discharge rearwardly into the ejector nozzle through an annular slot provided in the inner surface thereof, and duct means openly communicating the plenum chamber in sealed relation with each primary nozzle for conducting all of the pressurized engine exhaust gases from the plenum chamber to and through said at least one primary nozzle and thence rearwardly along the interior surface of the ejector nozzle.
Claim 3
Dependent Claim
30 words
Aircraft propulsion mechanism as claimed in claim 1 wherein the plenum chamber is an enclosure surrounding the aft end of the engine from which the engine exhaust gases are discharged.
Claim 4
Dependent Claim
36 words
Aircraft propulsion mechanism as claimed in claim 2 wherein the plenum chamber comprises the aft end of the nacelle in which the engine is mounted, from which aft end the sole exit is the duct means.
Claim 5
Dependent Claim
29 words
Aircraft propulsion mechanism as claimed in claim 1 wherein said at least one ejector nozzle is mounted in transversely offset relation to the aft end portion of the nacelle.
Claim 6
Dependent Claim
41 words
Aircraft propulsion mechanism as claimed in cLaim 4 wherein a support strut supports the ejector nozzle from a closed, aft portion of the nacelle wherein the plenum chamber is provided, and the duct means extends through the interior of the strut.
Claim 7
Dependent Claim
35 words
Aircraft propulsion means as claimed in claim 4 wherein two ejector nozzles are mounted one on each side of the aft end of the nacelle in symmetrically spaced relation on opposite sides of the nacelle.
Claim 8
Dependent Claim
36 words
Aircraft propulsion means as claimed in claim 1 wherein at least one annular passage extends around the ejector nozzle and said annular passage is in open communication with said primary nozzle and with the duct means.
Claim 9
Dependent Claim
64 words
Aircraft propulsion mechanism as claimed in claim 3 wherein a single ejector nozzle is supported co-axially of, and in axially spaced relation aft of the closed aft end of the nacelle, support means for the ejector nozzle comprising a pair of hollow stangs mounted on opposite sides of the nacelle and the ejector nozzle, the duct means being provided interiorly of the hollow stangs.
Claim 10
Dependent Claim
80 words
Aircraft propulsion means as claimed in claim 1 wherein a single annular enclosure is mounted coaxially around the aft end of the nacelle and in radially spaced relation thereto, a plurality of ejector nozzles are mounted in symmetrically spaced relation within the space between the nacelle and the annular enclosure, means closing off such space with the exception of the ejector nozzles, the duct means comprising a duct communicating the plenum chamber with a primary nozzle in each ejector nozzle.
Claim 11
Dependent Claim
40 words
Aircraft propulsion means as claimed in claim 9 wherein the plenum chamber comprises a cylindrical extension of the aft end of the nacelle, and coaxially within the annular enclosure, and means closing the aft end of the cylindrical nacelle extension.
Claim 12
Dependent Claim
23 words
Aircraft propulsion means as claimed in claim 10 and a streamlined coaxial conical extension on the aft end of the cylindrical nacelle extension.
References Cited (Backward Citations)
US2412825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |