Patent US2371127A successfully refreshed from Google Patents.
Patent US3970252A successfully refreshed from Google Patents.
US3970252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooled exhaust duct
Assignee: Motors Liquidation Co
•
Filing: 1967-09-28
•
Granted: 1976-07-20
•
Expires: 1987-09-28
Abstract
Abstract An exhaust duct for a turbofan aircraft engine includes a bulbous inner cone which blocks direct sight of the turbine through the duct. Ram air from the fan is caught by scoops and conveyed from a plenum into the double outer wall of the exhaust duct and through hollow struts to the inner cone. Circumferential outlets for film cooling air are distributed axially of the surface of the outer and inner walls. Also, film cooling air is discharged from the struts to cool the rear part of the struts which are visible from without the engine. Direct radiation from within the cone to the outside is blocked by ribs extending into the inside of the inner cone immediately upstream of the cooling air outlets.
Inventors
- 👤 Charles H. Smale
- 👤 James A. Pyne, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:32
CPC Classifications
B; B64; B64D; B64D33/00; B64D33/04; F; F02; F02K; F02K1/00; F02K1/78; F02K1/82; F02K1/822; F02K1/825
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A film cooled gas turbine exhaust duct comprising, in combination, an outer body, a bulbous hollow inner inner body, the bodies defining between them an exhaust duct for hot gas, the inner body comprising a plural number of radially spaced telescoped sections defining gaps spaced axially of the exhaust duct for flow of cooling gas between the sections, the gaps extending circumferentially of the exhaust duct and opening in the direction of flow through the exhaust duct so as to provide a film of cooling gas over the surface of the inner body, ribs disposed circumferentially of the inside of the inner body adjacent the gaps so as to block direct transmission of radiation from within the inner body through the gaps, and means for supplying a cooling gas into the inner body.
Claim 2
Dependent Claim
133 words
A film cooled gas turbine exhaust duct comprising, in combination, an outer body, a bulbous hollow inner inner body, the bodies defining between them an exhaust duct for hot gas, the inner body comprising a plural number of radially spaced telescoped sections defining gaps spaced axially of the exhaust duct for flow of cooling gas between the sections, the gaps extending circumferentially of the exhaust duct and opening in the direction of flow through the exhaust duct so as to provide a film of cooling gas over the surface of the inner body, ribs disposed circumferentially of the inside of the inner body adjacent the gaps so as to block direct transmission of radiation from within the inner body through the gaps, and means for supplying a cooling gas into the inner body.
Claim 3
Dependent Claim
18 words
An exhaust duct as recited in claim 1 including also means providing film cooling for the outer body.
Claim 4
Dependent Claim
32 words
An exhaust duct as recited in claim 1 including also struts extending radially between the said bodies, and means defining gaps for cooling gas extending radially on the sides of the struts.
Claim 5
Dependent Claim
18 words
An exhaust duct as recited in claim 3 includng also means providing film cooling for the outer body.
Claim 6
Dependent Claim
30 words
An exhaust duct as recited in claim 1 in which the last-recited means includes at least one air scoop projecting from the outer body in position to intercept slipstream air.
Claim 7
Dependent Claim
183 words
A cooled exhaust cone for a propulsion engine comprising, in combination, a hollow outer wall defined by mutually spaced outer and inner sheets, an inner wall defining a substantially closed chamber within the inner wall, the outer and inner walls defining between them an engine exhaust duct, means defining a cooling air plenum chamber disposed around the outer wall, hollow struts extending across the exhaust duct connecting the plenum chamber to the said closed chamber, means connecting the plenum chamber to the space between the outer and inner sheets, means defining annular axially-spaced film cooling outlets for the cooling air from the inner sheet and the inner wall extending circumferentially of the exhaust duct so as to provide a film of cooling air over the outer and inner walls of the exhaust duct, with circumferential ribs extending from the inner wall into the chamber therein in position to block direct radiation through the film cooling outlets of the inner wall, and air scoops projecting from the plenum chamber adapted to pressurize the chamber with air diverted from a slipstream passing the exhaust cone.
Claim 8
Dependent Claim
183 words
A cooled exhaust cone for a propulsion engine comprising, in combination, a hollow outer wall defined by mutually spaced outer and inner sheets, an inner wall defining a substantially closed chamber within the inner wall, the outer and inner walls defining between them an engine exhaust duct, means defining a cooling air plenum chamber disposed around the outer wall, hollow struts extending across the exhaust duct connecting the plenum chamber to the said closed chamber, means connecting the plenum chamber to the space between the outer and inner sheets, means defining annular axially-spaced film cooling outlets for the cooling air from the inner sheet and the inner wall extending circumferentially of the exhaust duct so as to provide a film of cooling air over the outer and inner walls of the exhaust duct, with circumferential ribs extending from the inner wall into the chamber therein in position to block direct radiation through the film cooling outlets of the inner wall, and air scoops projecting from the plenum chamber adapted to pressurize the chamber with air diverted from a slipstream passing the exhaust cone.
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) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |