Airfoil pedestaled trailing edge region cooling configuration

Claim 1

An airfoil having a suction side wall and a pressure side wall defining a forward portion of said airfoil and a trailing edge region of said airfoil, said trailing edge region including a trailing edge, said suction side wall and said pressure side wall being spaced apart defining a cooling air cavity within said forward portion and a slot of width W in said trailing edge region, said slot being in communication with said cavity for receiving cooling air from said cavity, said airfoil including means defining outlet passageways through said trailing edge in communication with said slot for discharging cooling air from said slot through said trailing edge; a plurality of spaced apart pedestals extending across said slot from said pressure side wall to said suction side wall, said pedestals being arranged in an array wherein they are located at each vortex formed by two criss-crossing sets of parallel lines, the distance between adjacent parallel lines in both sets being equivalent to define a grid of congruent diamonds, said sets of parallel lines being angled relative to each other such that a line connecting a first pair of opposing vertices of each diamond is substantially parallel to the spanwise direction of the airfoil; a plurality of suction side fences joining each pair of adjacent pedestals along each of the lines of one of said two sets of criss-crossing parallel lines, wherein each suction side fence is a wall of length G and of height A extending inwardly from said suction side wall, said height A being less than the slot width W; and a plurality of pressure side fences joining each pair of adjacent pedestals along each of the lines of said other of said two sets of criss-crossing parallel lines, wherein each pressure side fence is a wall of height B extending inwardly from said pressure side wall, said height B being less than the slot width W.