Patent ID: 9080451
Filing Date: 2015-07-14
Classification: F01D,F05D

Abstract:
1. An airfoil, comprising: a. an interior surface; b. an exterior surface opposed to the interior surface, wherein the exterior surface comprises a pressure side, a suction side opposed to the pressure side, a stagnation line between the pressure and suction sides, and a trailing edge between the pressure and suction sides and downstream from the stagnation line; c. a plurality of stagnation trench segments forming a radial column of stagnation trench segments on the exterior surface, wherein the stagnation line passes through at least a portion of each of the stagnation trench segments, the plurality of stagnation trench segments comprising a first stagnation trench segment having a first end radially and axially spaced from a second end, and a second stagnation trench segment radially adjacent to the first stagnation trench segment and having a first end radially and axially spaced from a second end, wherein the second end of the first stagnation trench segment radially overlap with the first end of the second stagnant trench segment; and d. at least one cooling passage in each stagnation trench segment, wherein the cooling passages provide fluid communication from the interior surface to the exterior surface.