Title:
軸流タービン
Document Type and Number:
Japanese Patent JP4373629
Kind Code:
B2
Abstract:
In the axial turbine according to the present invention, a nozzle blade 1 and/or a movable blade 5 has a profile in which a throat-pitch ratio "s/t" is maximized at a blade-central portion in height, wherein "s" being a shortest distance between a rear edge of a nozzle blade (movable blade) and a back side of another nozzle blade that is adjacent to the nozzle blade, and "t" being a pitch of the nozzle blades disposed in the row, minimized in a position between the blade-central portion in height and a blade-root portion and increased from a minimized value to the blade-root portion. This structure enables to provide the axial turbine, which permits to control flow distribution of the working fluid in the height direction of the blade in the passage between the blades of a turbine nozzle unit and a turbine movable nozzle and reduce the blade profile loss and the secondary flow loss at the blade-root portion, thus making a further improvement in the turbine stage efficiency.
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Inventors:
Junichi Tominaga
Kawasaki Ei
Tanuma Yuushi
Kenichi Imai
Kawasaki Ei
Tanuma Yuushi
Kenichi Imai
Application Number:
JP2001264722A
Publication Date:
November 25, 2009
Filing Date:
August 31, 2001
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
F01D5/14; F01D9/02; F01D9/04
Domestic Patent References:
| JP2000045704A | ||||
| JP8109803A | ||||
| JP1106903A | ||||
| JP6272504A | ||||
| JP3189303A |
Attorney, Agent or Firm:
Hisashi Hatano
Shunguchi Sekiguchi
Shunguchi Sekiguchi