US5102298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial flow turbine
Assignee: Alstom SA
•
Filing: 1990-08-23
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Granted: 1992-04-07
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Expires: 2010-08-23
Abstract
Abstract An axial flow turbine, whose outlet rotor blades (12) are followed by a diffuser (13), has first means (8) within the retardation zone of the diffuser for swirl removal from the swirling flow. A row with adjustable guide vanes (11) is arranged between these first means for swirl removal in the form of aerodynamic ribs and the outlet rotor blades. These guide vanes (11) have a straight mean camber line with a symmetrical aerofoil section, are conically shaped in the radial direction and are twisted. In addition to a substantial improvement in the pressure recovery over a wide load range, this measure also permits the vortex usually occurring between the rotor blades and the aerodynamic ribs to be prevented.
Inventors
- 👤 Franz Kreitmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:38
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/16; F01D17/162; F01D25/00; F01D25/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
79 words
Axial flow turbine comprising: a plurality of rotor blades include a set of outlet rotor blades from which a swirling gas flow may be discharged, a diffuser following said outlet rotor blades in a gas flow direction, means for swirl removal from the swirling flow, said swirl removal means being provided with a retardation zone of the diffuser, and at least one row of adjustable guide vanes arranged between the means for swirl removal and the outlet rotor blades.
Claim 2
Dependent Claim
79 words
Axial flow turbine comprising: a plurality of rotor blades include a set of outlet rotor blades from which a swirling gas flow may be discharged, a diffuser following said outlet rotor blades in a gas flow direction, means for swirl removal from the swirling flow, said swirl removal means being provided with a retardation zone of the diffuser, and at least one row of adjustable guide vanes arranged between the means for swirl removal and the outlet rotor blades.
Claim 3
Dependent Claim
23 words
Axial flow turbine as claimed in claim 1, wherein the guide vanes have a straight mean camber line with a symmetrical aerofoil section.
Claim 4
Dependent Claim
19 words
Axial flow turbine as claimed in claim 2, wherein the guide vanes are conically shaped in the radial direction.
Claim 5
Dependent Claim
14 words
Axial flow turbine as claimed in claim 2, wherein the guide vanes are twisted.
Claim 6
Dependent Claim
29 words
Axial flow turbine as claimed in claim 1, wherein the pitch/chord ratio of the guide vanes is between 0.5 and 1 in the center section of the flow duct.
Claim 7
Dependent Claim
55 words
Axial flow turbine as claimed in claim 1, wherein the means for swirl removal within the diffuser are aerodynamic ribs which are arranged evenly around the periphery and which have a straight mean camber line, a symmetrical aerofoil section and a pitch/chord ratio between 0.5 and 1 in the center section of the flow duct.
Claim 8
Dependent Claim
19 words
Axial flow turbine as claimed in claim 6, wherein the aerodynamic ribs are conically shaped in the radial direction.
Claim 9
Dependent Claim
41 words
Method of operating an axial flow turbine as claimed in claim 1, wherein the guide vanes are adjusted as a function of operating parameters in such a way that the shaft power assumes the maximum possible value at each operating condition.
Claim 10
Dependent Claim
49 words
Method of operating an axial flow turbine as claimed in claim 1, wherein the guide vanes are adjusted as a function of operating parameters in such a way that the pressure between the outlet rotor blades and the guide vanes assumes the lowest possible value at each operating condition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |