Patent ID: 8684691
Filing Date: 2014-04-01
Classification: F01D

Abstract:
1. A turbine blade, comprising: a generally elongated blade having a leading edge, a trailing edge, a tip at a first end, a root coupled to the blade at a second end generally opposite the first end for supporting the blade and for coupling the blade to a disc, and an internal cooling system formed from at least one cavity positioned within the generally elongated blade; and at least one pressure side rib extending radially from an outer surface of the tip, wherein the at least one pressure side rib includes a chamfered surface positioned at an acute angle relative to an outer surface of the generally elongated blade forming a pressure side; at least one film cooling hole positioned in the at least one pressure side rib with an outlet in an outer surface in the at least one pressure side rib and an inlet that couples the at least one film cooling hole with the at least one cavity forming the internal cooling system wherein the outlet of the at least one film cooling hole is positioned in the chamfered surface of the at least one pressure side rib; wherein the at least one film cooling hole in the chamfered surface of the at least one pressure side rib is formed from a compound diffuser film cooling hole having at least one tapered section with an increasing cross-sectional area; at least one suction side rib extending radially from an outer surface of the tip, wherein the at least one suction side rib includes a chamfered surface positioned at an acute angle relative to an outer surface of the tip of the generally elongated blade; at least one film cooling hole positioned in the at least one suction side rib with an outlet in an outer surface in the at least one suction side rib and an inlet that couples the at least one film cooling hole with the at least one cavity forming the internal cooling system; wherein the at least one pressure side rib and the at least one suction side rib are separated by a linear tip surface in which a plurality of outlets of film cooling holes reside.