US3579993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound suppression system
Assignee: Rohr Inc
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Filing: 1969-08-04
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Granted: 1971-05-25
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Expires: 1989-08-04
Abstract
Abstract System includes a nozzle connected to turbine exhaust outlet to confine and direct gas stream. Nozzle is corrugated to form peripherally spaced radially extending lobes to divide gas into small jet streams. Conduit surrounds exhaust outlet and discharges to exterior of nozzle, and fan air flows through passages between lobes to meet gas streams at exit margin of nozzle. Shroud or ejector sleeve defines and surrounds a mixing zone aft of the exit margin. Leading edge of shroud is spaced aft of fan air conduit to provide annular flow path for entry of ambient air to surround and mix with fan air and gas. Shroud is retractable to surround nozzle in spaced relation and prevent dispersion of fan air before mixing in normal cruising flight.
Inventors
- 👤 Carole S Tanner
- 👤 Remo Tontini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:55
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/40; F02K1/36; F05; F05D; F05D2260/00; F05D2260/96; F05D2260/962; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
272 words
A sound suppression system for a fan-jet engine having a turbine exhaust outlet, comprising: a nozzle defining and surrounding a discharge zone immediately aft of the exhaust outlet to confine the exhaust gas stream during the initial stage of its aft travel; said nozzle being corrugated to define a plurality of peripherally spaced, radially extending lobes having a substantially continuous, generally coplanar exit margin; each lobe constituting a separate rearwardly directed discharge passage for a portion of the exhaust gas stream; each pair of adjacent lobes defining between them an axially directed external flow path for air to be mixed with the separated gas streams aft of said exit margin; conduit means to supply fan air to each of said flow paths, and a generally cylindrical shroud surrounding and spaced outwardly from the nozzle, said shroud having a leading edge and a trailing edge and being movable between a first, stowed position in which said leading edge is substantially coplanar with the forward end of said nozzle and arranged to prevent the ingress of ambient air, and said trailing edge is in the vicinity of said exit margin to define an outer boundary for said flow paths and prevent dispersion of said fan air prior to arrival at said exit margin; and a second, deployed position in which said leading edge is substantially coplanar with said exit margin to provide a flow path for the entrance of ambient air to surround said fan air and exhaust gas mix therewith, the length of said shroud between its leading and trailing edges being sufficient to provide a mixing chamber for said air and gas.
Claim 2
Dependent Claim
272 words
A sound suppression system for a fan-jet engine having a turbine exhaust outlet, comprising: a nozzle defining and surrounding a discharge zone immediately aft of the exhaust outlet to confine the exhaust gas stream during the initial stage of its aft travel; said nozzle being corrugated to define a plurality of peripherally spaced, radially extending lobes having a substantially continuous, generally coplanar exit margin; each lobe constituting a separate rearwardly directed discharge passage for a portion of the exhaust gas stream; each pair of adjacent lobes defining between them an axially directed external flow path for air to be mixed with the separated gas streams aft of said exit margin; conduit means to supply fan air to each of said flow paths, and a generally cylindrical shroud surrounding and spaced outwardly from the nozzle, said shroud having a leading edge and a trailing edge and being movable between a first, stowed position in which said leading edge is substantially coplanar with the forward end of said nozzle and arranged to prevent the ingress of ambient air, and said trailing edge is in the vicinity of said exit margin to define an outer boundary for said flow paths and prevent dispersion of said fan air prior to arrival at said exit margin; and a second, deployed position in which said leading edge is substantially coplanar with said exit margin to provide a flow path for the entrance of ambient air to surround said fan air and exhaust gas mix therewith, the length of said shroud between its leading and trailing edges being sufficient to provide a mixing chamber for said air and gas.
Claim 3
Dependent Claim
260 words
A sound suppression system for fan-jet engine having a turbine exhaust outlet, comprising: a nozzle defining and surrounding a discharge zone immediately aft of the exhaust outlet to confine the exhaust gas stream during the initial stage of its aft travel; said nozzle being corrugated to definE a plurality of peripherally spaced, radially extending lobes having a substantially continuous exit margin; each lobe constituting a separate, rearwardly directed discharge passage for a portion of the exhaust gas stream, each pair of adjacent lobes defining between them an axially directed external flow path for air to be mixed with the separated gas streams aft of said exit margin, conduit means to supply fan air to each of said flow paths, and a generally cylindrical shroud surrounding the nozzle said shroud having a leading edge and a trailing edge and being movable between a first, stowed position in which said leading edge is in sealing relation with said fan air supply conduit means to prevent the ingress of ambient air, and said trailing edge is in the vicinity of said exit margin to define an outer boundary for said flow paths and prevent dispersion of said fan air prior to arrival at said exit margin, and a second, axially deployed position in which said leading edge is spaced rearwardly from said fan air supply conduit means to provide a flow path therebetween for the ingress of ambient air, and said trailing end projects aft beyond the exit margin a distance sufficient to provide a mixing chamber for said air and exhaust gas.
Claim 4
Dependent Claim
260 words
A sound suppression system for fan-jet engine having a turbine exhaust outlet, comprising: a nozzle defining and surrounding a discharge zone immediately aft of the exhaust outlet to confine the exhaust gas stream during the initial stage of its aft travel; said nozzle being corrugated to definE a plurality of peripherally spaced, radially extending lobes having a substantially continuous exit margin; each lobe constituting a separate, rearwardly directed discharge passage for a portion of the exhaust gas stream, each pair of adjacent lobes defining between them an axially directed external flow path for air to be mixed with the separated gas streams aft of said exit margin, conduit means to supply fan air to each of said flow paths, and a generally cylindrical shroud surrounding the nozzle said shroud having a leading edge and a trailing edge and being movable between a first, stowed position in which said leading edge is in sealing relation with said fan air supply conduit means to prevent the ingress of ambient air, and said trailing edge is in the vicinity of said exit margin to define an outer boundary for said flow paths and prevent dispersion of said fan air prior to arrival at said exit margin, and a second, axially deployed position in which said leading edge is spaced rearwardly from said fan air supply conduit means to provide a flow path therebetween for the ingress of ambient air, and said trailing end projects aft beyond the exit margin a distance sufficient to provide a mixing chamber for said air and exhaust gas.
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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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |