Patent ID: 8388304
Filing Date: 2013-03-05
Classification: F01D,F05D

Abstract:
1. A turbine airfoil assembly, comprising: a generally elongated, hollow airfoil having a leading edge, a trailing edge, an endwall coupled to a first end of the generally elongated, hollow airfoil and extending generally orthogonal to a longitudinal axis of the generally elongated, hollow airfoil, and a cooling system formed from at least one cavity in the elongated, hollow airfoil; a plurality of first endwall cooling channels extending in the endwall from a line aligned with a midchord region of the generally elongated, hollow airfoil to a trailing edge of the endwall, wherein the plurality of first endwall cooling channels are aligned with each other and have a density of first endwall cooling channels; a plurality of second endwall cooling channels extending from the line aligned with the midchord region of the generally elongated, hollow airfoil to the trailing edge of the endwall, wherein the plurality of second endwall cooling channels are aligned with each other and have a density of second endwall cooling channels; wherein the second endwall cooling channels are positioned in a trailing edge cooling region in the endwall, wherein the trailing edge cooling region is at least partially aligned with the intersection between the trailing edge of the generally elongated, hollow airfoil and the endwall; wherein the density of the second endwall cooling channels is greater than the density of the first endwall cooling channels; and wherein the trailing edge cooling region having a density of second endwall cooling channels in the endwall is defined by a plurality of cooling channels aligned with each other and positioned between a second endwall cooling channel that is positioned radially inward from an outer surface of a suction side of the airfoil and that is positioned between the trailing edge and a first side edge of the endwall closest to the suction side of the airfoil, and a second endwall cooling channel that is positioned closer to an opposite second side edge of the endwall and between the trailing edge and the opposite second side edge.