Turbine airfoil cooling system with near wall pin fin cooling chambers
First Claim
1. A turbine airfoil, comprising:
- a generally elongated, hollow airfoil having a leading edge, a trailing edge, a tip section at a first end, a root coupled to the airfoil at an end generally opposite the first end for supporting the airfoil and for coupling the airfoil to a disc, and a cooling system formed from at least one cavity in the elongated, hollow airfoil;
an outer wall forming the generally elongated airfoil;
an inner wall positioned in close proximity to the outer wall forming a pressure side near wall cooling chamber proximate to a pressure side of the generally elongated, hollow airfoil and forming a suction side near wall cooling chamber proximate to a suction side of the generally elongated, hollow airfoil;
a leading edge cooling chamber positioned proximate to the leading edge of the generally elongated, hollow airfoil and extending generally spanwise through the generally elongated, hollow airfoil;
a trailing edge cooling chamber positioned proximate to the trailing edge of the generally elongated, hollow airfoil and extending generally spanwise through the generally elongated, hollow airfoil;
wherein the pressure side near wall cooling chamber extends from the leading edge cooling chamber to the trailing edge cooling chamber and includes a plurality of pin fins extending from the outerwall to the inner wall;
wherein the suction side near wall cooling chamber extends from the leading edge cooling chamber to the trailing edge cooling chamber and includes a plurality of pin fins extending from the outerwall to the inner wall; and
wherein the pressure side near wall cooling chamber has an inlet providing cooling fluids from proximate to the leading edge such that cooling fluids flow in a direction from the leading edge toward the trailing edge and the suction side near wall cooling chamber has an inlet proximate to the trailing edge cooling chamber from the pressure side near wall cooling chamber such that cooling fluids flow in a direction from the trailing edge toward the leading edge establishing a counterflow, wherein the pressure side and suction side near wall cooling chambers are separated by a rib at the leading edge.
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Accused Products
Abstract
A cooling system for a turbine airfoil of a turbine engine having a suction side near wall cooling chamber extending from the leading edge to the trailing edge. The suction side near wall cooling chamber may include a plurality of pin fins for increasing the cooling effectiveness of the suction side near wall cooling chamber. The pin fins may be formed in two or more regions having varying sizes and quantities per unit area to accommodate different cooling requirements across the airfoil. In one embodiment, cooling fluids may flow in a counterflow manner through the suction side near wall cooling chamber relative to a pressure side near wall cooling chamber. In another embodiment, the cooling fluids may flow from the leading edge through the suction side near wall cooling chamber and be exhausted through slots in the trailing edge.
46 Citations
20 Claims
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1. A turbine airfoil, comprising:
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a generally elongated, hollow airfoil having a leading edge, a trailing edge, a tip section at a first end, a root coupled to the airfoil at an end generally opposite the first end for supporting the airfoil and for coupling the airfoil to a disc, and a cooling system formed from at least one cavity in the elongated, hollow airfoil; an outer wall forming the generally elongated airfoil; an inner wall positioned in close proximity to the outer wall forming a pressure side near wall cooling chamber proximate to a pressure side of the generally elongated, hollow airfoil and forming a suction side near wall cooling chamber proximate to a suction side of the generally elongated, hollow airfoil; a leading edge cooling chamber positioned proximate to the leading edge of the generally elongated, hollow airfoil and extending generally spanwise through the generally elongated, hollow airfoil; a trailing edge cooling chamber positioned proximate to the trailing edge of the generally elongated, hollow airfoil and extending generally spanwise through the generally elongated, hollow airfoil; wherein the pressure side near wall cooling chamber extends from the leading edge cooling chamber to the trailing edge cooling chamber and includes a plurality of pin fins extending from the outerwall to the inner wall; wherein the suction side near wall cooling chamber extends from the leading edge cooling chamber to the trailing edge cooling chamber and includes a plurality of pin fins extending from the outerwall to the inner wall; and wherein the pressure side near wall cooling chamber has an inlet providing cooling fluids from proximate to the leading edge such that cooling fluids flow in a direction from the leading edge toward the trailing edge and the suction side near wall cooling chamber has an inlet proximate to the trailing edge cooling chamber from the pressure side near wall cooling chamber such that cooling fluids flow in a direction from the trailing edge toward the leading edge establishing a counterflow, wherein the pressure side and suction side near wall cooling chambers are separated by a rib at the leading edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. (canceled)
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18. A turbine airfoil, comprising:
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a generally elongated, hollow airfoil having a leading edge, a trailing edge, a tip section at a first end, a root coupled to the airfoil at an end generally opposite the first end for supporting the airfoil and for coupling the airfoil to a disc, and a cooling system formed from at least one cavity in the elongated, hollow airfoil; an outer wall forming the generally elongated airfoil; an inner wall positioned in close proximity to the outer wall forming a suction side near wall cooling chamber proximate to a suction side of the generally elongated, hollow airfoil and a pressure side cooling chamber proximate to a pressure side of the generally elongated, hollow airfoil, wherein the pressure side cooling chamber is adjacent to the suction side near wall cooling chamber; a leading edge cooling chamber positioned proximate to the leading edge of the generally elongated, hollow airfoil and extending generally spanwise through the generally elongated, hollow airfoil; a trailing edge cooling slots positioned proximate to the trailing edge of the generally elongated, hollow airfoil; wherein the suction side near wall cooling chamber extends from the leading edge cooling chamber to the trailing edge cooling slots and includes a plurality of pin fins extending from the outerwall to the inner wall; wherein the pressure side near wall cooling chamber extends from the leading edge cooling chamber to the trailing edge cooling chamber and includes a plurality of pin fins extending from the outerwall to the inner wall; and wherein the pressure side near wall cooling chamber has an inlet providing cooling fluids from proximate to the leading edge such that cooling fluids flow in a direction from the leading edge toward the trailing edge and the suction side near wall cooling chamber has an inlet proximate to the trailing edge cooling chamber from the pressure side near wall cooling chamber such that cooling fluids flow in a direction from the trailing edge toward the leading edge establishing a counterflow, wherein the pressure side and suction side near wall cooling chambers are separated by a rib at the leading edge. - View Dependent Claims (19, 20)
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Specification