Turbine airfoil with integral chordal support ribs
First Claim
1. A turbine airfoil, comprising:
- a generally elongated hollow airfoil formed from an outer wall, and having a leading edge, a trailing edge, a pressure side wall, a suction side wall positioned generally opposite from the pressure side wall; and
a cooling system in the hollow airfoil, comprising;
at least one trailing edge cooling channel positioned immediately adjacent to the trailing edge of the hollow airfoil;
at least one cooling fluid supply channel in the hollow airfoil positioned proximate to the trailing edge cooling channel and extending between an inner surface of the pressure side wall and an inner surface of the suction side wall;
a plurality of pin fins forming a pin fin bank extending between an inner surface of the pressure side wall and an inner surface of the suction side wall and positioned in the trailing edge cooling channel; and
at least one chordal rib protruding from an inner surface of the outer wall of the hollow airfoil and extending in a general chordwise direction from a mid-chord region of the hollow airfoil toward the trailing edge and into the pin fin bank.
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Accused Products
Abstract
A turbine airfoil including a structural support system formed from chordal ribs within an internal cooling system in the airfoil. The chordal ribs forming the structural support system may be positioned in a cooling fluid supply channel in the hollow airfoil that is positioned proximate to a trailing edge cooling channel. The trailing edge cooling channel may include a plurality of pin fins forming a pin fin bank extending between inner surfaces of the pressure side wall and suction side wall. The chordal ribs may protrude from an inner surface of the outer wall of the hollow airfoil and extend in a general chordwise direction from a mid-chord region of the hollow airfoil to the trailing edge and into the pin fin bank. The structural support system reduces stresses proximate to the pin fins in the pin fin bank closest to the mid-chord region of the airfoil.
28 Citations
20 Claims
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1. A turbine airfoil, comprising:
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a generally elongated hollow airfoil formed from an outer wall, and having a leading edge, a trailing edge, a pressure side wall, a suction side wall positioned generally opposite from the pressure side wall; and
a cooling system in the hollow airfoil, comprising;
at least one trailing edge cooling channel positioned immediately adjacent to the trailing edge of the hollow airfoil;
at least one cooling fluid supply channel in the hollow airfoil positioned proximate to the trailing edge cooling channel and extending between an inner surface of the pressure side wall and an inner surface of the suction side wall;
a plurality of pin fins forming a pin fin bank extending between an inner surface of the pressure side wall and an inner surface of the suction side wall and positioned in the trailing edge cooling channel; and
at least one chordal rib protruding from an inner surface of the outer wall of the hollow airfoil and extending in a general chordwise direction from a mid-chord region of the hollow airfoil toward the trailing edge and into the pin fin bank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A turbine airfoil, comprising:
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a generally elongated hollow airfoil formed from an outer wall, and having a leading edge, a trailing edge, a pressure side wall, a suction side wall positioned generally opposite from the pressure side wall; and
a cooling system in the hollow airfoil, comprising;
at least one trailing edge cooling channel positioned immediately adjacent to the trailing edge of the hollow airfoil;
at least one cooling fluid supply channel in the hollow airfoil positioned proximate to the trailing edge cooling channel and extending between an inner surface of the pressure side wall and an inner surface of the suction side wall;
a support rib extending between an inner surface of the pressure side wall and an inner surface of the suction side wall in a mid-chord region of the hollow airfoil and extending in a general spanwise direction to form a wall defining the at least one fluid supply channel;
a plurality of pin fins forming a pin fin bank extending between an inner surface of the pressure side wall to and an inner surface of the suction side wall and positioned in the trailing edge cooling channel;
a plurality of chordal ribs protruding from an inner surface of the suction side wall of the hollow airfoil and extending in a general chordwise direction from the support rib in the mid-chord region of the hollow airfoil to the trailing edge and into the pin fin bank; and
a plurality of crossover ribs extending between the inner surface of the pressure side wall to the inner surface of the suction side wall and positioned in the cooling fluid supply channel in close proximity to the pin fin bank. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A turbine airfoil, comprising:
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a generally elongated hollow airfoil formed from an outer wall, and having a leading edge, a trailing edge, a pressure side wall, a suction side wall positioned generally opposite from the pressure side wall; and
a cooling system in the hollow airfoil, comprising;
at least one trailing edge cooling channel positioned immediately adjacent to the trailing edge of the hollow airfoil;
at least one cooling fluid supply channel in the hollow airfoil positioned proximate to the trailing edge cooling channel and extending between an inner surface of the pressure side wall and an inner surface of the suction side wall;
a support rib extending between an inner surface of the pressure side wall and an inner surface of the suction side wall in a mid-chord region of the hollow airfoil and extending in a general spanwise direction to form a wall defining the at least one fluid supply channel;
a plurality of pin fins forming a pin fin bank extending between an inner surface of the pressure side wall to and an inner surface of the suction side wall and positioned in the trailing edge cooling channel; and
a plurality of crossover ribs extending between the inner surface of the pressure side wall to the inner surface of the suction side wall and positioned in the cooling fluid supply channel in close proximity to the pin fin bank.
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Specification