Stepped outlet turbine airfoil
First Claim
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1. A turbine airfoil comprising:
- opposite pressure and suction sidewalls extending longitudinally in span and axially in chord between opposite leading and trailing edges, and having an internal cooling circuit therein for circulating a coolant therethrough;
said pressure sidewall including a row of diverging outlet slots joined to said cooling circuit, and separated by corresponding converging partitions having opposite sidewalls defining sides of said slots;
each of said slots including in series a converging inlet, a throat of minimum flow area, and a diverging outlet exposed in said pressure sidewall, and separated from an adjacent outlet by an exposed converging land at the aft end of an intervening partition; and
each of said partitions includes a step in said partition sidewall for abruptly decreasing width of said partition and locally increasing divergence of said slots to diffuse said coolant discharged therethrough.
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Abstract
A turbine airfoil includes an internal cooling circuit between opposite pressure and suction sidewalls. The pressure sidewall includes a row of outlet slots for the circuit separated by converging partitions. Each slot includes an inlet, throat, and diverging outlet. Each of the partitions includes a step in a converging sidewall thereof for increasing divergence of the slots to diffuse coolant discharged therethrough.
35 Citations
23 Claims
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1. A turbine airfoil comprising:
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opposite pressure and suction sidewalls extending longitudinally in span and axially in chord between opposite leading and trailing edges, and having an internal cooling circuit therein for circulating a coolant therethrough; said pressure sidewall including a row of diverging outlet slots joined to said cooling circuit, and separated by corresponding converging partitions having opposite sidewalls defining sides of said slots; each of said slots including in series a converging inlet, a throat of minimum flow area, and a diverging outlet exposed in said pressure sidewall, and separated from an adjacent outlet by an exposed converging land at the aft end of an intervening partition; and each of said partitions includes a step in said partition sidewall for abruptly decreasing width of said partition and locally increasing divergence of said slots to diffuse said coolant discharged therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A turbine airfoil comprising:
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opposite pressure and suction sidewalls extending longitudinally in span and axially in chord between opposite leading and trailing edges; said sidewalls being spaced apart between said leading and trailing edges to define an internal cooling circuit therein for circulating a coolant therethrough; said pressure sidewall including a row of outlet slots extending therethrough along said trailing edge in flow communication with said cooling circuit for discharging said coolant therefrom; said slots being separated from each other by corresponding partitions having opposite sidewalls defining sides of said slots, and each slot includes an inlet at a forward end of said partitions, a throat following said inlet, and an outlet along an aft end of said partitions; and each of said slots diverges aft and includes a step in said partition sidewall increasing divergence for diffusing said coolant discharged therethrough. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification