Impingement cooled bucket shroud, turbine rotor incorporating the same, and cooling method
First Claim
Patent Images
1. A turbine blade comprising:
- a root portion for fixing said blade to a turbine rotor;
an airfoil portion extending longitudinally from said root;
at least one airfoil cooling passage extending through said airfoil, said airfoil cooling passage having an inlet for receiving a flow of cooling fluid;
a shroud projecting outwardly from said airfoil and having a radially inward facing surface and a radially outward facing surface;
a wall defining at least one exit hole for exiting cooling fluid from said airfoil cooling passage;
at least one shroud cooling chamber in flow communication with at least one said exit hole, said exit hole being directed towards a target wall surface of said cooling chamber, whereby said exit hole defines an impingement hole for impingement cooling said target wall surface as an impingement zone; and
at least one outlet aperture for flowing spent impingement cooling fluid out of said cooling chamber.
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Abstract
A localized directional impingement cooling is used to reduce the metal temperatures on highly stressed regions of the tip shroud.
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Citations
20 Claims
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1. A turbine blade comprising:
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a root portion for fixing said blade to a turbine rotor; an airfoil portion extending longitudinally from said root; at least one airfoil cooling passage extending through said airfoil, said airfoil cooling passage having an inlet for receiving a flow of cooling fluid; a shroud projecting outwardly from said airfoil and having a radially inward facing surface and a radially outward facing surface; a wall defining at least one exit hole for exiting cooling fluid from said airfoil cooling passage; at least one shroud cooling chamber in flow communication with at least one said exit hole, said exit hole being directed towards a target wall surface of said cooling chamber, whereby said exit hole defines an impingement hole for impingement cooling said target wall surface as an impingement zone; and at least one outlet aperture for flowing spent impingement cooling fluid out of said cooling chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A turbine rotor having a row of turbine blades, at least one of said turbine blades comprising:
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a root portion for fixing said blade to said turbine rotor; an airfoil portion extending longitudinally from said root; at least one airfoil cooling passage extending through said airfoil, said airfoil cooling passage having an inlet for receiving a flow of cooling fluid; a shroud projecting outwardly from said airfoil and having a radially inward facing surface; a wall defining at least one exit hole for exiting cooling fluid from said airfoil cooling passage; at least one shroud cooling chamber in flow communication with at least one said exit hole, said exit hole being oriented to direct cooling fluid towards a target impingement zone, whereby said exit hole defines an impingement hole for impingement cooling said target impingement zone; and at least one outlet opening for flowing spent impingement cooling fluid out of said cooling chamber. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of cooling a gas turbine airfoil having an associated substantially planar shroud extending in a plane substantially perpendicular to the airfoil, the method comprising:
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a) providing at least one airfoil cooling passage in said airfoil; b) providing at least one cooling chamber in said shroud; c) directing cooling air from the at least one airfoil cooling passage through at least one impingement hole towards a wall surface of the at least one cooling chamber; and d) directing spent impingement cooling air through at least one outlet opening in the cooling chamber. - View Dependent Claims (19, 20)
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Specification