US3846038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixed blading of axial compressors
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1972-12-14
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Granted: 1974-11-05
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Expires: 1992-12-14
Abstract
Abstract Fixed blading for an axial compressor constituted by a succession of blades fixed on at least one annular wall and a method of operating the same. Fluid passing through a passage between adjacent blades is drawn into a suction opening and the pressure at the suction opening is maintained substantially equal to the flow static pressure in the passage.
Inventors
- 👤 P Carriere
- 👤 J Leynaert
- 👤 G Meauze
- 👤 J Thibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:46
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/68; F04D29/681; F04D29/682; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/141; F01D5/145; F02; F02C; F02C6/00; F02C6/04; F02C6/06; F02C6/08; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
69 words
Fixed blading for an axial compressor constituted by a succession of blades fixed on at least one annular wall, each passage between two adjacent blades being provided with a suction opening, suction means associated with said suction opening for aspiring fluid through the suction opening, said suction means including means for maintaining the pressure in the suction opening substantially equal to the flow static pressure in the said passage.
Claim 2
Dependent Claim
69 words
Fixed blading for an axial compressor constituted by a succession of blades fixed on at least one annular wall, each passage between two adjacent blades being provided with a suction opening, suction means associated with said suction opening for aspiring fluid through the suction opening, said suction means including means for maintaining the pressure in the suction opening substantially equal to the flow static pressure in the said passage.
Claim 3
Dependent Claim
35 words
Fixed blading according to claim 1, wherein each suction opening comprises an upstream edge perpendicular to the annular lateral wall and an oblique downstream edge forming an acute angle with the abovesaid annular lateral wall.
Claim 4
Dependent Claim
22 words
Fixed blading according to claim 1, wherein each suction opening comprises a porous or perforated wall arranged to limit the aspirated flow-rate.
Claim 5
Dependent Claim
12 words
An aircraft turbo-reactor axial compressor, comprising fixed blading according to claim 1.
Claim 6
Dependent Claim
41 words
Fixed blading according to claim 1, said suction means including means for maintaining constant the ratio of the flow rate of the fluid aspired through the said suction opening to the flow rate of the fluid flowing through the said passage.
Claim 7
Dependent Claim
38 words
Fixed blading according to claim 1, said suction means including a regulator device operatively connected to the suction opening to regulate the suction pressure as a function of a particular pressure of the flow passing through the passage.
Claim 8
Dependent Claim
20 words
Fixed blading according to claim 1, including means for exhausting to the atmosphere the fluid aspirated through the suction opening.
Claim 9
Dependent Claim
46 words
Fixed blading according to claim 1, including means for delivering the fluid aspired through the suction opening to at least one other stage of the compressor situated upstream from said fixed blading for producing thereat a control effect on the boundary layer by a blast effect.
Claim 10
Dependent Claim
54 words
Fixed blading according to claim 1, said suction opening having an elongated shape extending across the whole width of said passage between an undersurface region of one blade situated towards its leading edge and a back surface region of the following blade situated in the first half of its length from its leading edge.
Claim 11
Dependent Claim
43 words
Fixed blading according to claim 9, wherein the suction opening extends between an undersurface region of a blade situated towards its leading edge and a back surface region of the following blade situated about two thirds of its length from its leading edge.
Claim 12
Dependent Claim
23 words
Fixed blading according to claim 1, said suction means including a buffer space adjacent the suction opening for receiving the fluid passing therethrough.
Claim 13
Dependent Claim
47 words
Fixed blading according to claim 11, including an exhaust means for controllably delivering fluid out of said buffer space, and means responsive to the flow static pressure in the passage and to the pressure in the buffer space for controlling the flow rate through the exhaust means.
Claim 14
Independent Claim
62 words
A method of operating an axial compressor of the type constituted by a succession of fixed blades fixed on at least one annular wall of the compressor, comprising the steps of: aspiring fluid from each passage between two adjacent blades through a suction opening, and maintaining the pressure in the suction opening substantially equal to the flow static pressure in the passage.
Claim 15
Independent Claim
62 words
A method of operating an axial compressor of the type constituted by a succession of fixed blades fixed on at least one annular wall of the compressor, comprising the steps of: aspiring fluid from each passage between two adjacent blades through a suction opening, and maintaining the pressure in the suction opening substantially equal to the flow static pressure in the passage.
Claim 16
Dependent Claim
55 words
A method according to claim 13, including delivering the fluid aspired through the suction opening into a buffer cavity, controllably delivering the fluid out of the buffer cavity, sensing the static flow pressure in the passage, sensing the pressure in the buffer cavity, and controlling said delivery in response to both of said sensed pressures.
Claim 17
Dependent Claim
27 words
The method of claim 13, including maintaining constant the ratio of the flow rate through the suction opening to the flow rate of fluid through the passage.
Claim 18
Dependent Claim
16 words
The method of claim 13, including the step of delivering the aspired fluid to the atmosphere.
Claim 19
Dependent Claim
37 words
The method of claim 13, including delivering the aspired fluid to at least one stage of the compressor upstream of the fixed blading to produce thereat a control effect on the boundary layer by a blast effect.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |