Patent ID: 8777567
Filing Date: 2014-07-15
Classification: F01D,Y02T,Y10T

Abstract:
1. A turbine blade, comprising: a first side wall including a first tip edge; a second side wall opposite the first side wall and including a second tip edge; a tip wall extending between the first side wall and the second side wall, the tip wall being recessed from the first tip edge of the first side wall and the second tip edge of the second side wall to form a coolant cavity, a tip recess cavity, a first parapet wall on the first side wall, and a second parapet wall on the second side wall, the coolant cavity defined in part by an interior surface of the tip wall, and the tip recess cavity defined, in part, by a surface of the tip wall, the first parapet wall, and the second parapet wall; a step formed on only the first side wall, between the first tip edge and the tip wall, the step dividing the first parapet wall into an outer radial section and an inner radial section, the inner radial section defining the step; and a cooling hole extending through the outer radial section, the step, and the tip wall, the cooling hole including an open channel section and a closed channel section, the open channel section comprising a minority portion of the height of the first parapet wall and extending from the first tip edge of the first parapet wall to the step through only the outer radial section, and the closed channel section extending through the step and the tip wall.