Turbine nozzle vane
First Claim
Patent Images
1. A turbine nozzle comprising:
- an array of nozzle blades disposed circumferentially in an annular passage defined between a hub end wall of an inner ring and a tip end wall of an outer ring and fixed to said hub and tip end walls; and
a flow passage defined between a pressure surface and a suction surface of adjacent ones of said nozzle blades, a cross section of said flow passage within a predetermined region from a leading edge of the nozzle blade in the meridional direction comprising a curved line on each of said pressure surface and said suction surface in a predetermined range of the blade height inwardly from said hub and tip end walls and a substantially straight line on each of said pressure surface and said suction surface in another range, wherein said predetermined range comprises a range corresponding to 20 to 40% of said blade height inwardly from said hub and tip end walls.
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Abstract
A turbine nozzle comprises an array of nozzle blades (1) U disposed circumferentially in an annular passage (4) defined between inner and outer rings of a diaphragm and fixed to the inner and outer rings of the turbine diaphragm. The flow passage is defined between a pressure surface (F) and a suction surface (B) of adjacent ones of the nozzle blades, and a cross section of the flow passage includes predetermined ranges extending along a blade height (h) from the inner and outer diameter surfaces (hub and tip end walls) and defined by a curved line, and another range defined by a substantially straight line.
40 Citations
6 Claims
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1. A turbine nozzle comprising:
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an array of nozzle blades disposed circumferentially in an annular passage defined between a hub end wall of an inner ring and a tip end wall of an outer ring and fixed to said hub and tip end walls; and
a flow passage defined between a pressure surface and a suction surface of adjacent ones of said nozzle blades, a cross section of said flow passage within a predetermined region from a leading edge of the nozzle blade in the meridional direction comprising a curved line on each of said pressure surface and said suction surface in a predetermined range of the blade height inwardly from said hub and tip end walls and a substantially straight line on each of said pressure surface and said suction surface in another range, wherein said predetermined range comprises a range corresponding to 20 to 40% of said blade height inwardly from said hub and tip end walls.
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2. A turbine nozzle comprising:
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an array of nozzle blades disposed circumferentially in an annular passage defined between a hub end wall of an inner ring and a tip end wall of an outer ring and fixed to said hub and tip end walls; and
a flow passage defined between a pressure surface and a suction surface of adjacent ones of said nozzle blades, a cross section of said flow passage within a predetermined region from a leading edge of the nozzle blade in the meridional direction comprising a curved line on each of said pressure surface and said suction surface in a predetermined range of the blade height inwardly from said hub and tip end walls and a substantially straight line on each of said pressure surface and said suction surface in another range, wherein said predetermined region comprises a region from said leading edge of said nozzle blade to a position of at least 30% of the blade width in the meridional direction.
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3. A turbine nozzle comprising:
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an array of nozzle blades disposed circumferentially in an annular passage defined between a hub end wall of an inner ring and a tip end wall of an outer ring and fixed to said hub and tip end walls; and
a flow passage defined between a pressure surface and a suction surface of adjacent ones of said nozzle blades, a cross section of said flow passage within a predetermined region from a leading edge of the nozzle blade in the meridional direction comprising a curved line on each of said pressure surface and said suction surface in a predetermined range of the blade height inwardly from said hub and tip end walls and a substantially straight line on each of said pressure surface and said suction surface in another range, wherein said cross section of said flow passage within a range from said leading edge of said nozzle blade to a position of at least 30% of the blade width in the meridional direction is defined by a line on said pressure surface and a line on said suction surface, each of said lines comprising a substantially straight line in a central portion which does not include a range corresponding to 20 to 40% of said blade height inwardly from said hub and tip end walls. - View Dependent Claims (4, 5, 6)
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Specification