Patent US3721389A successfully refreshed from Google Patents.
US3721389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exit nozzle assemblies for gas turbine power plants
Assignee: Boeing Co
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Filing: 1971-06-10
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Granted: 1973-03-20
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Expires: 1991-06-10
Abstract
Abstract A nozzle assembly for gas turbine power plants, particularly aircraft jet engines, which incorporates a generally annular splitter dividing the nozzle into two parts and provided on its surface with suitable sound-absorbing material. Incorporated into the splitter and forming a part thereof is apparatus for varying the cross-sectional area of the nozzle exit and, hence, the operating characteristics of the power plant. This latter means preferably comprises a plurality of arcuate segments hinged to the splitter and actuable from a position where they are flush with the remainder of the splitter surface to extended positions where they effectively reduce the nozzle cross-sectional area. The assembly, therefore, performs two functions. First, it provides additional sound-absorbing area; and, secondly, it acts as a nozzle area control device.
Inventors
- 👤 Kinnon M Mac
- 👤 B Syltebo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:27
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/02; F02K3/04; F02K3/077; F02K1/00; F02K1/06; F02K1/12; F02K1/1207; F02K1/78; F02K1/82; F02K1/827
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
In a gas turbine power plant having an exhaust nozzle defined by inner and outer essentially annular coaxial walls which form an annular space through which a high velocity gas stream passes and which terminates at a nozzle exit, the combination of an annular splitter assembly disposed in said annular space between said walls and provided with sound-absorbing means on the surfaces thereof, and resilient means incorporated internally into said splitter for expanding its cross-sectional area to thereby vary the effective cross-sectional area of said nozzle exit.
Claim 2
Dependent Claim
87 words
In a gas turbine power plant having an exhaust nozzle defined by inner and outer essentially annular coaxial walls which form an annular space through which a high velocity gas stream passes and which terminates at a nozzle exit, the combination of an annular splitter assembly disposed in said annular space between said walls and provided with sound-absorbing means on the surfaces thereof, and resilient means incorporated internally into said splitter for expanding its cross-sectional area to thereby vary the effective cross-sectional area of said nozzle exit.
Claim 3
Dependent Claim
51 words
The combination of claim 1 wherein said annular splitter assembly divides said nozzle exit into two ducts, the ratio of the width of one duct to its length being equal to the ratio of the width of the other duct to its length to obtain acoustical balance between the two ducts.
Claim 4
Dependent Claim
16 words
The combination of claim 1 wherein said sound-absorbing means comprises honeycomb structures covered with perforated plates.
Claim 5
Dependent Claim
53 words
The combination of claim 1 wherein said means for varying the effective cross-sectional areA of said nozzle exit comprises flap means movable from a position where it is essentially flush with the remainder of the surface of said splitter to a position where it extends into the nozzle to reduce its cross-sectional area.
Claim 6
Dependent Claim
18 words
The combination of claim 4 wherein said flap means is moved by means of an inflatable annular boot.
Claim 7
Dependent Claim
109 words
The combination of claim 1 wherein said means for varying the effective cross-sectional area of said nozzle exit comprises a plurality of arcuate ramps pivotally connected at their forward ends to said splitter and having free trailing ends, and a plurality of arcuate flaps pivotally connected at their trailing ends to said splitter and having their forward ends disposed beneath the trailing ends of said arcuate ramps, the arrangement being such that when said flaps are forced radially outwardly about their pivotal connection to the splitter the ramps will be forced radially outwardly about their pivotal connection to the splitter also, thereby reducing the cross-sectional area of said nozzle.
Claim 8
Dependent Claim
45 words
The combination of claim 1 wherein said power plant is suspended from an aircraft by a strut which passes through said annular space defining the exhaust nozzle, the splitter assembly being of tapered cross-sectional area to compensate for the pressure bump produced by said strut.
Claim 9
Dependent Claim
32 words
The combination of claim 7 wherein the cross-sectional area of said splitter assembly is greatest diametrically opposite said strut and reduces on opposite sides of the strut as it approaches the strut.
References Cited (Backward Citations)
No citation records indexed.
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 |