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Gas turbine engine

  • US 9,657,575 B2
  • Filed: 11/12/2013
  • Issued: 05/23/2017
  • Est. Priority Date: 05/13/2011
  • Status: Active Grant
First Claim
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1. A gas turbine engine comprising:

  • a turbine blade cascade formed by annularly arranging turbine blades around a turbine axis;

    a cooling air supply unit to supply cooling air to the turbine blades;

    a base surface which is a surface without depression portions or protrusion portions and on which at least a trailing half of each turbine blade in a chord length direction of the turbine blade is provided, the trailing half being a portion of the turbine blade from a middle position, which is between a leading edge and a trailing edge of the turbine blade, to the trailing edge of the turbine blade; and

    a flow path surface formed so as to be positioned in an upstream side of the turbine blade cascade and so as to be connected to the base surface,wherein the flow path surface includes;

    depression portions depressed relative to the base surface, each depression portion including at least an area overlapping with the leading edge of each of the turbine blades, when viewed from a direction of the turbine axis; and

    protrusion portions protruding relative to the base surface, each protrusion portion being at least part of each area positioned between the leading edges of the turbine blades, when viewed from the direction of the turbine axis.

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