US3572960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of sound in gas turbine engines
Assignee: General Electric Co
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Filing: 1969-01-02
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Granted: 1971-03-30
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Expires: 1989-01-02
Abstract
Abstract The disclosure shows a representative axial flow compressor in the form of a fan employed in reaction type propulsive engines. The inlet guide vanes and the rotor blades of this fan are provided with slots lengthwise of the outer portions of their trailing edges. Pressurized air is discharged from these slots to minimize circumferential velocity gradients immediately downstream of the vanes and blades. By minimizing such velocity gradients, sound generated by the air entering the rotating blades and the outlet guide vanes is minimized.
Inventors
- 👤 James W Mcbride
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:07
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/02; F02K3/04; F02K3/06; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F04; F04D; F04D29/00; F04D29/66; F04D29/68; F04D29/681; F04D29/684; F05; F05D; F05D2240/00; F05D2240/10; F05D2240/12; F05D2240/122; F05D2240/20; F05D2240/30; F05D2240/304; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
An axial flow compressor having a first row of fixed and a second row of rotatable cambered blades, said rows being axially spaced, said blades of said first row having, in their trailing edges, openings generally aligned with the median camber line of said blades, said openings comprising elongated slots extending from the outer ends of said blades inwardly for approximately 10 to 50 percent of the radial length of said blades, said slots tapering from a narrow width to a wider width toward the outer ends of said blades, and means for discharging pressurized air from said slots in a direction and with a velocity sufficient to, at least substantially, eliminate wakes in the trailing edges of said upstream row of blades.
Claim 2
Dependent Claim
123 words
An axial flow compressor having a first row of fixed and a second row of rotatable cambered blades, said rows being axially spaced, said blades of said first row having, in their trailing edges, openings generally aligned with the median camber line of said blades, said openings comprising elongated slots extending from the outer ends of said blades inwardly for approximately 10 to 50 percent of the radial length of said blades, said slots tapering from a narrow width to a wider width toward the outer ends of said blades, and means for discharging pressurized air from said slots in a direction and with a velocity sufficient to, at least substantially, eliminate wakes in the trailing edges of said upstream row of blades.
Claim 3
Dependent Claim
39 words
A compressor as recited in claim 1 further including a row of stationary outlet guide vanes positioned downstream of said second row of blades, said first row of blades comprising stationary inlet toward the outer end of said blades.
Claim 4
Dependent Claim
261 words
In an axial flow compressor including at least two circumferential rows of cambered blades, said rows being axially spaced and one of said rows rotating, the upstream row of blades being provided with trailing edge openings, said openings being adapted to provide for the flow of pressurized air therethrough in a direction, and with a velocity sufficient to, eliminate wakes in the trailing edges of said upstream row of blades, the improvement which comprises: said trailing edge openings being positioned such that said pressurized air exits therefrom in a direction substantially parallel to the camber line of each of said blades of said upstream row, said trailing edge openings comprising elongated slots extending from the outer ends of said rotating blades inwardly approximately 10 to 50 percent of the radial length of said blades, and said slots being tapered from a narrow width to a wider width guide vanes, the blades of said second row having, in their trailing edges, openings generally aligned with the median camber line of said blades of said second row, said openings in said blades comprising elongated slots disposed at the outer ends of said blades and having a radial length of approximately 10 to 50 percent of the length of said blades, said slots being tapered from a minimum width at their inner ends to a maximum width at their outer ends, and means for discharging pressurized air from the openings of said blades in a direction and with a velocity sufficient to, at least substantially, eliminate wakes in the trailIng edges of said blades.
Claim 5
Dependent Claim
261 words
In an axial flow compressor including at least two circumferential rows of cambered blades, said rows being axially spaced and one of said rows rotating, the upstream row of blades being provided with trailing edge openings, said openings being adapted to provide for the flow of pressurized air therethrough in a direction, and with a velocity sufficient to, eliminate wakes in the trailing edges of said upstream row of blades, the improvement which comprises: said trailing edge openings being positioned such that said pressurized air exits therefrom in a direction substantially parallel to the camber line of each of said blades of said upstream row, said trailing edge openings comprising elongated slots extending from the outer ends of said rotating blades inwardly approximately 10 to 50 percent of the radial length of said blades, and said slots being tapered from a narrow width to a wider width guide vanes, the blades of said second row having, in their trailing edges, openings generally aligned with the median camber line of said blades of said second row, said openings in said blades comprising elongated slots disposed at the outer ends of said blades and having a radial length of approximately 10 to 50 percent of the length of said blades, said slots being tapered from a minimum width at their inner ends to a maximum width at their outer ends, and means for discharging pressurized air from the openings of said blades in a direction and with a velocity sufficient to, at least substantially, eliminate wakes in the trailIng edges of said 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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |