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Impingement cooled bucket shroud, turbine rotor incorporating the same, and cooling method

  • US 7,568,882 B2
  • Filed: 01/12/2007
  • Issued: 08/04/2009
  • Est. Priority Date: 01/12/2007
  • Status: Active Grant
First Claim
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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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