US3829020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Translating sleeve variable area nozzle and thrust reverser
Assignee: Boeing Co
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Filing: 1973-06-13
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Granted: 1974-08-13
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Expires: 1993-06-13
Abstract
Abstract A variable area discharge nozzle and thrust reversing mechanism for a jet engine wherein an annular exhaust nozzle having a telescopic sleeve, forms the aft section of the exhaust nozzle duct and a fixed plug centerbody is mounted within the duct. For the low speed takeoff and landing mode of airplane operation, the aft section of the exhaust duct is translated rearward thereby withdrawing in combination, a telescopic sleeve section having cascade vanes and an internal cover for the cascade vanes. With the cascade vanes and cover in the aft position, the overall length of the exhaust duct is extended and through the contoured centerbody and inner duct wall, the exhaust nozzle exit area is increased. Also, in this position the cascades are exposed externally and the thrust reversing mechanism is in the armed position, To reverse the thrust the cover under the cascade vanes is slid forward to expose them and through an interconnecting linkage mechanism, a blocker door downstream of the cascade vanes, blocks the rearward flow of the exhaust fluid and causes it to exhaust through the cascade vanes. As an additional embodiment, for sound suppression, a plurality of acoustically treated struts are hinged to and retract into the centerbody for stowage, and are radially extended into the exhaust duct flow for the sound suppression mode.
Inventors
- 👤 G Stearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:50
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/06; F02K1/09; F02K1/54; F02K1/56; F02K1/62; F02K1/625; F02K1/78; F02K1/82; F02K1/827; F05; F05D; F05D2250/00; F05D2250/30; F05D2250/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
Apparatus for varying the exit area of a jet engine discharge nozzle and for attenuating the noise therefrom, comprising: a sleeve forming the outer aft wall section of the discharge nozzle and mounted for telescopic movement; a center-body stationarily mounted within the discharge nozzle and having an external surface contour in combination with the interior surface of the discharge nozzle for forming a converging flow area to the discharge nozzle exit; means for extending the sleeve aft to increase the length and internal area of the discharge nozzle and to increase the discharge nozzle exit area; an acoustically treated strut hinged to the centerbody; and means connecting the strut to the sleeve such that the strut is deployed to extend into the exhaust flow upon aft translation of the sleeve for providing noise attenuation.
Claim 2
Dependent Claim
134 words
Apparatus for varying the exit area of a jet engine discharge nozzle and for attenuating the noise therefrom, comprising: a sleeve forming the outer aft wall section of the discharge nozzle and mounted for telescopic movement; a center-body stationarily mounted within the discharge nozzle and having an external surface contour in combination with the interior surface of the discharge nozzle for forming a converging flow area to the discharge nozzle exit; means for extending the sleeve aft to increase the length and internal area of the discharge nozzle and to increase the discharge nozzle exit area; an acoustically treated strut hinged to the centerbody; and means connecting the strut to the sleeve such that the strut is deployed to extend into the exhaust flow upon aft translation of the sleeve for providing noise attenuation.
Claim 3
Dependent Claim
198 words
Apparatus for varying the exit area of a jet engine discharge nozzle and for attenuating the noise therefrom, comprising: a primary sleeve forming the outer aft wall section of the discharge nozzle and mounted thereto for telescopic movement; said primary sleeve having a cascade vane ring attached at its upstream end; said cascade vane ring comprising a circumferential series of cascade vane panels arranged in a substantialLy continuous circumferential hoop tension member, and being housed within the nozzle wall when the primary sleeve is at its forward stowed position; a secondary sleeve having an acoustically lined interior surface disposed inside the cascade vane ring to form an inner cover therefore; a centerbody stationarily mounted within the discharge nozzle and having an external surface contour in combination with the interior surface of the discharge nozzle for forming a converging flow area to the discharge nozzle exit; means for simultaneously translating the primary and secondary sleeve aft to increase the discharge nozzle exit area while maintaining flow area convergency to the discharge nozzle exit, and to increase the length and internal area of the discharge nozzle, and expose the acoustically lined interior surface of the secondary sleeve for noise attenuation.
Claim 4
Dependent Claim
198 words
Apparatus for varying the exit area of a jet engine discharge nozzle and for attenuating the noise therefrom, comprising: a primary sleeve forming the outer aft wall section of the discharge nozzle and mounted thereto for telescopic movement; said primary sleeve having a cascade vane ring attached at its upstream end; said cascade vane ring comprising a circumferential series of cascade vane panels arranged in a substantialLy continuous circumferential hoop tension member, and being housed within the nozzle wall when the primary sleeve is at its forward stowed position; a secondary sleeve having an acoustically lined interior surface disposed inside the cascade vane ring to form an inner cover therefore; a centerbody stationarily mounted within the discharge nozzle and having an external surface contour in combination with the interior surface of the discharge nozzle for forming a converging flow area to the discharge nozzle exit; means for simultaneously translating the primary and secondary sleeve aft to increase the discharge nozzle exit area while maintaining flow area convergency to the discharge nozzle exit, and to increase the length and internal area of the discharge nozzle, and expose the acoustically lined interior surface of the secondary sleeve for noise attenuation.
Claim 5
Dependent Claim
48 words
The apparatus as set forth in claim 2, further comprising: an acoustically treated strut hinged to the centerbody; and means connecting the strut to the sleeve such that the strut is deployed to extend into the exhaust flow upon aft translation of the sleeve, for providing noise attenuation.
Claim 6
Dependent Claim
161 words
Apparatus for varying the exit area of a jet engine discharge nozzle for reversing the flow thereof, comprising: a primary sleeve forming the outer aft wall of the discharge nozzle and mounted for telescopic movement; said primary sleeve having a cascade vane ring attached at its upstream end; a secondary sleeve disposed inside the cascade vane ring and forming an inner cover therefore; a centerbody stationarily mounted within the discharge nozzle; means for translating the primary and secondary sleeve aft to increase the nozzle exit area; a blocker door hinged to the primary sleeve and connected to the secondary sleeve such that a relative extending motion between the two sleeves, actuates the blocker door radially inward toward the centerbody; and means for translating the secondary sleeve forward relative to the primary sleeve to uncover the cascade vanes and actuate the blocker door to block the exhaust flow so as to turn the flow through the cascade vanes for reversing the thrust.
Claim 7
Dependent Claim
161 words
Apparatus for varying the exit area of a jet engine discharge nozzle for reversing the flow thereof, comprising: a primary sleeve forming the outer aft wall of the discharge nozzle and mounted for telescopic movement; said primary sleeve having a cascade vane ring attached at its upstream end; a secondary sleeve disposed inside the cascade vane ring and forming an inner cover therefore; a centerbody stationarily mounted within the discharge nozzle; means for translating the primary and secondary sleeve aft to increase the nozzle exit area; a blocker door hinged to the primary sleeve and connected to the secondary sleeve such that a relative extending motion between the two sleeves, actuates the blocker door radially inward toward the centerbody; and means for translating the secondary sleeve forward relative to the primary sleeve to uncover the cascade vanes and actuate the blocker door to block the exhaust flow so as to turn the flow through the cascade vanes for reversing the thrust.
Claim 8
Dependent Claim
286 words
Apparatus for varying the exit area of a jet engine discharge nozzle, for attenuating the noise therefrom, and for reversing the flow thereof, comprising: a primary sleeve forming the outer aft wall section of the discharge nozzle and mounted thereto for telescopic movement; said primary sleeve having a cascade vane ring attached at its upstream end; said cascade vane ring comprising a circumferential series of cascade vane panels arranged in a substantially continuous circumferential hoop tension member, and being housed within the nozzle wall when the primary sleeve is at its forward stowed position; a secondary sleeve having an acoustically lined interior surface disposed inside the cascade vane ring to form an inner cover therefore; a centerbody stationarily mounted within the discharge nozzle and having an external surface contour in combination with the interior surface of the discharge nozzle for forming a converging flow area to the discharge nozzle eixt; means for simultaneously translating the primary and secondary sleeve aft to increase the discharge nozzle exit area while maintaining flow area convergency to the discharge nozzle exit, and to increase the length and internal area of the discharge nozzle, and to expose the acoustically lined interior surface of the secondary sleeve for noise attenuation; a plurality of blocker doors hinged to the primary sleeve in a substantially continuous circumferential series arrangement, and connected to the secondary sleeve such that a relative extending motion between the two sleeves, actuates the blocker doors radially inward toward the centerbody; and means for translating the secondary sleeve forward to the primary sleeve to uncover the cascade vanes and actuate the blocker doors to block the exhaust flow so as to turn the flow through the cascade vanes for thrust reversing.
Claim 9
Dependent Claim
286 words
Apparatus for varying the exit area of a jet engine discharge nozzle, for attenuating the noise therefrom, and for reversing the flow thereof, comprising: a primary sleeve forming the outer aft wall section of the discharge nozzle and mounted thereto for telescopic movement; said primary sleeve having a cascade vane ring attached at its upstream end; said cascade vane ring comprising a circumferential series of cascade vane panels arranged in a substantially continuous circumferential hoop tension member, and being housed within the nozzle wall when the primary sleeve is at its forward stowed position; a secondary sleeve having an acoustically lined interior surface disposed inside the cascade vane ring to form an inner cover therefore; a centerbody stationarily mounted within the discharge nozzle and having an external surface contour in combination with the interior surface of the discharge nozzle for forming a converging flow area to the discharge nozzle eixt; means for simultaneously translating the primary and secondary sleeve aft to increase the discharge nozzle exit area while maintaining flow area convergency to the discharge nozzle exit, and to increase the length and internal area of the discharge nozzle, and to expose the acoustically lined interior surface of the secondary sleeve for noise attenuation; a plurality of blocker doors hinged to the primary sleeve in a substantially continuous circumferential series arrangement, and connected to the secondary sleeve such that a relative extending motion between the two sleeves, actuates the blocker doors radially inward toward the centerbody; and means for translating the secondary sleeve forward to the primary sleeve to uncover the cascade vanes and actuate the blocker doors to block the exhaust flow so as to turn the flow through the cascade vanes for thrust reversing.
Claim 10
Dependent Claim
51 words
The apparatus as set forth in claim 5, further comprising: a plurality of acoustically treated struts hinged to the centerbody; and means connecting the struts to the primary sleeve such that they are deployed to extend into the exhaust flow upon aft translation of the primary sleeve, for providing noise attenuation.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |