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Gas turbine row #1 steam cooled vane

  • US 6,019,572 A
  • Filed: 08/06/1998
  • Issued: 02/01/2000
  • Est. Priority Date: 08/06/1998
  • Status: Expired due to Term
First Claim
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1. In a turbine, a vane segment having a closed-loop steam cooling system, the vane segment comprising:

  • an outer shroud comprising;

    an outer platform having a target surface on an inside surface of walls of said outer platform exposed to a working gas of the turbine;

    outer railings, which are situated along edges of said outer platform;

    a plurality of rectangular waffle structures on the target surface to enhance heat transfer between said outer shroud and cooling steam;

    an outer cover positioned on said outer railings;

    an outer impingement plate situated between said cover and said platform to form (i) an outer plenum between said outer impingement plate and said outer cover, and (ii) a relatively small space between said outer impingement plate and said outer platform, said outer impingement plate having a plurality of impingement holes for producing impingement jets of cooling steam to contact the target surface of said outer platform;

    at least one inlet situated on said outer cover for providing cooling steam to the vane segment; and

    at least one outlet situated on said outer cover for exhausting steam;

    an inner shroud comprising;

    an inner platform having a target surface on an inside surface of walls of said inner platform exposed to the working gas of the turbine;

    inner railings situated along edges of said inner platform;

    a plurality of rectangular waffle structures on the target surface of said platform to enhance heat transfer between said inner shroud and the cooling steam;

    an inner cover positioned on said inner railings; and

    an inner impingement plate situated between said inner cover and said inner platform to form (i) an inner plenum between said inner impingement plate and said inner cover, and (ii) a relatively small space between said inner impingement plate an a said inner platform, said inner impingement plate having a plurality of impingement holes for producing impingement jets of cooling steam to contact the target surface of said inner platform; and

    an airfoil having a first end connected to said outer platform and a second end connected to said inner platform, said airfoil comprising;

    walls having a target surface on an inside surface of said walls exposed to the working gas of the turbine;

    a plurality of rectangular waffle structures on the target surface of said walls to enhance heat transfer between said airfoil and the cooling steam; and

    at least one cavity to serve as a passageway for cooling steam to flow between said outer shroud and said inner shroud.

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