Gas turbine airfoil
AssigneeMitsubishi Hitachi Power Systems, Ltd.
InventorsHisato Tagawa, Yasuhiro Horiuchi
Life of this patent
Estimating the term…
Abstract
A gas turbine airfoil is provided that is superior in the cooling performance of an end wall and in the thermal efficiency of a gas turbine. A gas turbine airfoil includes an airfoil portion having a cooling passage therein; and an end wall portion located at an inner band end portion of the airfoil portion in the turbine-radial direction. Cooling holes are disposed in the leading edge side hook portion of the end wall portion. The plurality of cooling holes are arranged at different distance of intervals in the circumferential direction of the gas turbine. Cooling air that has flowed in the cooling passage is configured to flow from the cooling holes toward the leading edge of the end wall portion.
Claims8
A gas turbine airfoil, comprising:
- an airfoil portion having a cooling passage therein;
- an end wall portion located on an end portion of one side of the airfoil portion in a radial direction of a gas turbine;
- a leading edge side hook portion located on a leading edge side of the airfoil portion, the leading edge side hook portion being adapted to allow the end wall portion to be engaged with a diaphragm adjacent to the end wall portion;
- and
- a plurality of cooling holes disposed in the leading edge side hook portion so as to be connected to the cooling passage, wherein the plurality of cooling holes are provided:
- in a circumferential direction of the gas turbine;
- at each of a first area and a second area in the circumferential direction of the gas turbine, the first area being located between a first point, at which a plane including a central axis of the gas turbine is in contact with a suction side of the airfoil portion, and a second point set at a predetermined position on the pressure surface of the airfoil portion, the second area being an area other than the first area in the circumferential direction of the gas turbine;
- and
- in intervals, which are narrower in the first area than in the second area.
Dependencies are inferred from the claim text.