Turbine blade wall cooling apparatus and method of fabrication

A turbine blade comprising:

• a external pressure side plate comprising a plurality of external pressure ribs;
• an internal pressure side plate comprising a plurality of internal pressure ribs;
• an external suction side plate comprising a plurality of external suction ribs;
• an internal suction side plate comprising a plurality of internal suction ribs;
• a plurality of pressure flow redirection areas;
• a plurality of suction flow redirection areas;
• said external pressure side plate disposed over said internal pressure side plate so as to form a pressure side double wall;
• and
• said external suction side plate disposed over said internal suction side plate so as to form a suction side double wall;
• wherein said external pressure ribs are disposed at a first angle with respect to a blade span reference line and said internal pressure ribs are disposed at a second angle with respect to said blade span reference line so as to form said pressure flow redirection areas;
• wherein said external suction ribs are disposed at said first angle with respect to said blade span reference line and said internal suction ribs are disposed at said second angle with respect to said blade span reference line so as to form said suction flow redirection areas;
• wherein said pressure side double wall is configured so as to pass a portion of a coolant through said pressure side double wall;
• wherein said suction side double wall is configured so as to pass said another portion of said coolant through said suction side double wall.

A method of fabricating a pressure side double wall and a suction side double wall for a turbine blade comprising:

• constructing a pressure lattice structure comprising a plurality of external pressure ribs, a plurality of internal pressure ribs, and a plurality of pressure flow redirection areas, wherein said external pressure ribs are disposed at a first angle with respect to a blade span reference line and said internal pressure ribs are disposed at a second angle with respect to said blade span reference line so as to form said plurality of pressure flow redirection areas, wherein said external pressure side plate is aligned over said internal pressure side plate;
• constructing a suction lattice structure comprising a plurality of external suction ribs, a plurality of internal suction ribs, and a plurality of suction flow redirection areas, wherein said external suction ribs are disposed at a first angle with respect to said blade span reference line and said internal suction ribs are disposed at a second angle with respect to said blade span reference line so as to form said plurality of suction flow redirection areas, wherein said external pressure side plate is aligned over said internal pressure side plate;
• processing said pressure lattice structure so as to form said pressure side double wall, wherein said pressure side double wall comprises a external pressure side plate comprising said external pressure ribs and an internal pressure side plate comprising said internal pressure side ribs;
• and
• processing said suction lattice structure so as to form said suction side double wall, wherein said suction side double wall comprises a external suction side plate comprising said external suction ribs and an internal suction side plate comprising said internal suction side ribs;
• wherein said pressure side double wall is configured so as to pass a portion of a coolant through said pressure side double wall;
• wherein said suction side double wall is configured so as to pass said another portion of said coolant through said suction side double wall.