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Patent US3721314A successfully refreshed from Google Patents.
US3721314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silencer or muffler for the composite nozzle of an aircraft jet engine
Assignee: Safran Aircraft Engines SAS
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Filing: 1972-01-19
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Granted: 1973-03-20
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Expires: 1992-01-19
Abstract
Abstract A silencer or muffler device for a jet engine nozzle efflux system, of the type which includes a primary nozzle which emits into the divergent section of a secondary nozzle, formed by the inner wall of an afterbody with a streamlined outer wall, a primary jet of hot gases surrounded by a flow of secondary air; said device comprising a plurality of scoop-like members adapted to be moved between an active position in which they penetrate into the jet, as regards their upstream end, in the manner of scoops so as to bleed off portions of the jet of hot gases and of the flow of secondary air and discharge them in to the ambient atmosphere upstream of the exit of the divergent section by way of openings in the afterbody, so forming fractional jets around the central jet which is formed by the non-bled portion of the primary jet and of the secondary flow, and an inactive position in which they fit into the said openings and reconstitute the continuity of the wall of the divergent section.
Inventors
- 👤 R Hoch
- 👤 L Jumelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:04
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/54; F02K1/56; F02K1/60; F02K1/38; F02K1/383; F02K1/46; F02K1/50; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
A silencer or muffler device for a jet engine nozzle efflux system, of the type which includes a primary nozzle which emits into the divergent section of a secondary nozzle, formed by the inner wall of an afterbody with a streamlined outer wall, a primary jet of hot gases surrounded by a flow of secondary air; said device comprising a plurality of scoop-like members adapted to be moved between an active position in which they penetrate into the jet, as regards their upstream end, in the manner of scoops so as to bleed off portions of the jet of hot gases and of the flow of secondary air and discharge them into the ambient atmosphere upstream of the exit of the divergent section by way of openings in the afterbody, so forming fractional jets around the central jet which is formed by the non-bled porTion of the primary jet and of the secondary flow, and an inactive position in which they fit into the said openings and reconstitute the continuity of the wall of the divergent section.
Claim 2
Dependent Claim
177 words
A silencer or muffler device for a jet engine nozzle efflux system, of the type which includes a primary nozzle which emits into the divergent section of a secondary nozzle, formed by the inner wall of an afterbody with a streamlined outer wall, a primary jet of hot gases surrounded by a flow of secondary air; said device comprising a plurality of scoop-like members adapted to be moved between an active position in which they penetrate into the jet, as regards their upstream end, in the manner of scoops so as to bleed off portions of the jet of hot gases and of the flow of secondary air and discharge them into the ambient atmosphere upstream of the exit of the divergent section by way of openings in the afterbody, so forming fractional jets around the central jet which is formed by the non-bled porTion of the primary jet and of the secondary flow, and an inactive position in which they fit into the said openings and reconstitute the continuity of the wall of the divergent section.
Claim 3
Dependent Claim
36 words
A device as claimed in claim 1, in which said scoop-like members comprise tubular members with a closed configuration which, in the inactive position, also reconstitute the continuity of the streamlined outer wall of the afterbody.
Claim 4
Dependent Claim
57 words
A device as claimed in claim 1, in which the opening of said apertures into said afterbody outer wall is provided with pivoting flaps which are normally closed and complement the said outer wall and which are adapted to open under the effect of the pressure of fluid discharged by said scoop-like members in the active position.
Claim 5
Dependent Claim
79 words
A device as claimed in claim 1, said device being for a nozzle of the type which at the rear comprises pivoting parts in the form of buckets which in normal flight are applied to the rear of the afterbody and move away therefrom at take-off, so opening orifices in the shape of lunules, in which said scoop-like members are housed in their inactive position in or against channels in the afterbody which open to the said lunule-shaped orifices.
Claim 6
Dependent Claim
41 words
A device as claimed in claim 4, in which the channels are made in a scarfed formation, running from the inside towards the outside, in the afterbody and terminate at the rear edge of the streamlined outer surface of the latter.
Claim 7
Dependent Claim
62 words
A silencer as claimed in claim 5, in which the channels start from a throat which separates the divergent section from a convergent section formed upstream by the inner surface of the afterbody, and the inner walls forming the base of said scoop-like members have a curved-up upstream portion so as to apply itself against the convergent section in the inactive position.
Claim 8
Dependent Claim
28 words
A device as claimed in claim 4, in which said scoop-like members include cheeks or side walls which in the inactive position fit into grooves in the channels.
Claim 9
Dependent Claim
81 words
An efflux system provided with a silencer or muffler device as claimed in claim 5, in which portions of the afterbody included between two adjacent channels are provided with crenellations for the entry of tertiary air and made in a scarfed formation from the outside towards the inside, the base of which starts from the streamlined outer surface of the afterbody so as to terminate at the rear edge of the inner surface of the latter, which forms the divergent section.
Claim 10
Dependent Claim
49 words
An efflux device provided with a silencer or muffler device as claimed in claim 4, in which the bases of the channels in which said scoop-like members are housed are formed by portions of the afterbody in the shape of tabs traversed by passages having port on the outside.
Claim 11
Dependent Claim
56 words
An efflux device as claimed in claim 9, in which said passages are equipped with guide-vanes which are so shaped as to impart to a gaseous stream flowing between them from the rear to the front and from the inside towards the outside of the afterbody a component which is tangential in relation to the latter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |