Title:
LOW-PRESSURE STEAM TURBINE AND METHOD FOR OPERATING THE SAME
Document Type and Number:
Japanese Patent JP2012031864
Kind Code:
A
Abstract:
To provide a low-pressure steam turbine last stage that can overcome loss due to reverse vortices resulting from low last stage exit velocity.
A last stage 18 includes a plurality of stationary vanes 14 circumferentially distributed to form a vane row, each vane has an airfoil 31, and the airfoil 31 has a span 36 extending radially from a base 38 to a tip 20 of the airfoil 31. A plurality of blades 12 are circumferentially mounted and distributed on a rotatable rotor 17 of the steam turbine 10, and a K ratio is defined as a ratio of vane throat 24 to a pitch 26. Each of the vanes includes a leading edge 20 that is skewed so as to form a W-shaped K-distribution across the span 36 of the vanes 14.
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Inventors:
HALLER BRIAN ROBERT
Application Number:
JP2011166364A
Publication Date:
February 16, 2012
Filing Date:
July 29, 2011
Export Citation:
Assignee:
ALSTOM TECHNOLOGY LTD
International Classes:
F01D5/14; F01D9/02; F01D17/00; F01D17/20
Domestic Patent References:
| JP2004263679A | 2004-09-24 | |||
| JPH0610604A | 1994-01-18 | |||
| JPH08109803A | 1996-04-30 | |||
| JP2003027901A | 2003-01-29 | |||
| JP2009121468A | 2009-06-04 | |||
| JPS6380003A | 1988-04-11 |
Foreign References:
| EP2075408A2 | 2009-07-01 | |||
| US20070071606A1 | 2007-03-29 |
Attorney, Agent or Firm:
Takuya Kuno
Toshio Yano
Takahashi
Kiyoshi Kuruma
Kimihiro Hoshi
Hiroyasu Ninomiya
Ryoichi Shino
Einzel Felix-Reinhard
Toshio Yano
Takahashi
Kiyoshi Kuruma
Kimihiro Hoshi
Hiroyasu Ninomiya
Ryoichi Shino
Einzel Felix-Reinhard
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