US3575260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for augmenting the thrust of a jet-propelled aircraft and suppressing the noise thereof
Assignee: Rohr Inc
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Filing: 1969-05-15
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Granted: 1971-04-20
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Expires: 1989-05-15
Abstract
Abstract A tubular ejector is mounted on the nacelle of a jet-propelled aircraft so that it can be stowed alongside the nacelle or positioned downstream therefrom. A pair of hemicylindrical panels are mounted on the lower portion of the outer side of the ejector for movement between a stowed position alongside the ejector and a deployed position wherein one of the panels projects from the aft end of the ejector and the other panel projects from the aft end of said one panel. The jet stream flowing through the ejector is prevented from detaching from the inner surface thereof by admitting a portion of the boundary layer of said jet stream into holes which terminate within an area encircling the aft portion of said inner surface and which communicate with the forward portion of the ejector throat.
Inventors
- 👤 George R Urguhart
- 👤 Remo Tontini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:53
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/36; F02K1/44
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
118 words
A method of suppressing the noise of a jet-propelled aircraft, which comprises surrounding the thrust gas discharged from an engine of said aircraft with an annular stream of atmospheric air in a tubular ejector, intercepting the expansion boundary of the combined stream of thrust gas and atmospheric air at a point aft of said ejector, admitting a portion of the boundary layer of said combined stream of thrust gas and atmospheric air into holes which terminate within an area encircling the aft portion of the inner surface of said ejector and which communicate with the forward portion of the ejector throat, and discharging said admitted portion of said stream into said ejector throat at the forward end thereof.
Claim 2
Independent Claim
118 words
A method of suppressing the noise of a jet-propelled aircraft, which comprises surrounding the thrust gas discharged from an engine of said aircraft with an annular stream of atmospheric air in a tubular ejector, intercepting the expansion boundary of the combined stream of thrust gas and atmospheric air at a point aft of said ejector, admitting a portion of the boundary layer of said combined stream of thrust gas and atmospheric air into holes which terminate within an area encircling the aft portion of the inner surface of said ejector and which communicate with the forward portion of the ejector throat, and discharging said admitted portion of said stream into said ejector throat at the forward end thereof.
Claim 3
Dependent Claim
164 words
In combination with an aircraft having a jet engine enclosed in a nacelle, thrust-augmenting and sound-suppressing apparatus comprising a tubular ejector mounted on said aircraft fOr movement between a first position wherein said ejector is disposed around the aft portion of said nacelle and a second position wherein said ejector is positioned downstream from said nacelle and thrust gas discharged from said jet engine and atmospheric air pass therethrough, means on said aircraft for moving said ejector between said first and second positions thereof, a panel mounted on the lower portion of the outer side of said ejector for movement between a first position wherein said panel is positioned alongside said ejector and a second position wherein at least a portion of said panel is positioned downstream from said ejector and between the earth''s surface and the stream of thrust gas and atmospheric air issuing from said ejector, and means on said aircraft for moving said panel between said first and second positions thereof.
Claim 4
Dependent Claim
164 words
In combination with an aircraft having a jet engine enclosed in a nacelle, thrust-augmenting and sound-suppressing apparatus comprising a tubular ejector mounted on said aircraft fOr movement between a first position wherein said ejector is disposed around the aft portion of said nacelle and a second position wherein said ejector is positioned downstream from said nacelle and thrust gas discharged from said jet engine and atmospheric air pass therethrough, means on said aircraft for moving said ejector between said first and second positions thereof, a panel mounted on the lower portion of the outer side of said ejector for movement between a first position wherein said panel is positioned alongside said ejector and a second position wherein at least a portion of said panel is positioned downstream from said ejector and between the earth''s surface and the stream of thrust gas and atmospheric air issuing from said ejector, and means on said aircraft for moving said panel between said first and second positions thereof.
Claim 5
Dependent Claim
84 words
Apparatus as defined in claim 2 including a second hemicylindrical panel mounted on the outer side of the panel attached to said ejector and movable between a first position alongside the latter panel and a second position wherein at least a portion thereof is downstream from the latter panel and between the earth''s surface and said stream of thrust gas and atmospheric air issuing from said ejector, and means on said aircraft for moving said second panel between said first and second positions thereof.
Claim 6
Dependent Claim
14 words
Apparatus as defined in claim 3 wherein each of said panels is substantially hemicylindrical.
Claim 7
Dependent Claim
59 words
Apparatus as defined in claim 2 wherein the inner surface of said ejector is perforate adjacent the aft end thereof, holes in said perforate portion of said inner surface being disposed circumferentially about the throat of the ejector and communicating with the forward portion of said throat through at least one internal, longitudinally extending passage in the ejector wall.
Claim 8
Dependent Claim
16 words
Apparatus as defined in claim 5 wherein said internal passage encircles the throat of said ejector.
Claim 9
Dependent Claim
27 words
Apparatus as defined in claim 6 wherein said internal passage communicates with the forward portion of the throat of said ejector through an opening encircling said throat.
Claim 10
Dependent Claim
28 words
Apparatus as defined in claim 7 wherein said opening is inclined so that its inner portion is forward of its outlet at the inner surface of the ejector.
Claim 11
Dependent Claim
42 words
Apparatus as defined in claim 6 wherein said internal passage communicates with the forward portion of the throat of said ejector through a plurality of holes extending through the ejector wall adjacent the forward end thereof and disposed circumferentially about said throat.
Claim 12
Dependent Claim
37 words
Apparatus as defined in claim 9 wherein said holes adjacent the forward end of said ejector are inclined relative to the longitudinal axis of said ejector so that their inner ends are forward of their outer ends.
Claim 13
Dependent Claim
30 words
Apparatus as defined in claim 6 wherein said internal passage communicates with the forward and aft portions of the throat of said ejector through porous sections of the ejector wall.
References Cited (Backward Citations)
US2487588A
Cited
FR997262A
Cited
US3067968A
Cited
US3095696A
Cited
US3027710A
Cited
FR1436412A
Cited
GB1019857A
Cited
US3244255A
Cited
US3437173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |