US3713748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine ducted fan engine
Assignee: MINI OF AVIAT SUPPLY
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Filing: 1971-04-19
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Granted: 1973-01-30
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Expires: 1991-04-19
Abstract
Abstract A gas turbine engine having a multi-stage fan in which the blade rows are spaced apart by at least one and a half chord widths of the adjacent upstream blade to reduce noise. A flow splitter divides the flow through the fan into radially outer and inner flow passages. The first row of stator blades of the fan is reduced in chord width in the inner passage and an additional stage of blading is disposed in the inner passage only, between the first row of stator blades and the second row of rotor blades.
Inventors
- 👤 K Langley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:35
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/02; F02K3/04; F02K3/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
A gas turbine engine comprising a multi-stage fan mounted in an annular flow duct, the fan including first and second rows of rotor blades, a flow splitter which divides the duct into radially inner and outer flow passages, the rows of rotor blades extending across both passages, first rows of stator blades extending across each passage between the rotor blade rows, the rows of blades in at least the outer flow passage being axially spaced from the adjacent upstream blade row by at least one and a half times the length of the chord of the blades in said upstream row, the radially inner passage additionally including a row of rotor and stator blades disposed between said first row of stator blades and the second row of rotor blades.
Claim 2
Dependent Claim
129 words
A gas turbine engine comprising a multi-stage fan mounted in an annular flow duct, the fan including first and second rows of rotor blades, a flow splitter which divides the duct into radially inner and outer flow passages, the rows of rotor blades extending across both passages, first rows of stator blades extending across each passage between the rotor blade rows, the rows of blades in at least the outer flow passage being axially spaced from the adjacent upstream blade row by at least one and a half times the length of the chord of the blades in said upstream row, the radially inner passage additionally including a row of rotor and stator blades disposed between said first row of stator blades and the second row of rotor blades.
Claim 3
Dependent Claim
129 words
A gas turbine engine comprising a multi-stage fan mounted in an annular flow duct, the fan including first and second rows of rotor blades, a flow splitter which divides the duct into radially inner and outer flow passages, the rows of rotor blades extending across both passages, first rows of stator blades extending across each passage between the rotor blade rows, the rows of blades in at least the outer flow passage being axially spaced from the adjacent upstream blade row by at least one and a half times the length of the chord of the blades in said upstream row, the radially inner passage additionally including a row of rotor and stator blades disposed between said first row of stator blades and the second row of rotor blades.
Claim 4
Dependent Claim
129 words
A gas turbine engine comprising a multi-stage fan mounted in an annular flow duct, the fan including first and second rows of rotor blades, a flow splitter which divides the duct into radially inner and outer flow passages, the rows of rotor blades extending across both passages, first rows of stator blades extending across each passage between the rotor blade rows, the rows of blades in at least the outer flow passage being axially spaced from the adjacent upstream blade row by at least one and a half times the length of the chord of the blades in said upstream row, the radially inner passage additionally including a row of rotor and stator blades disposed between said first row of stator blades and the second row of rotor blades.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |