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Impingement cooled transition duct

  • US 4,719,748 A
  • Filed: 12/15/1986
  • Issued: 01/19/1988
  • Est. Priority Date: 05/14/1985
  • Status: Expired due to Term
First Claim
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1. An impingement cooling apparatus for cooling a surface of a transition duct disposed between a combustor and a turbine stage of a gas turbine engine, said transition duct being disposed in a compressed air plenum, comprising:

  • an impingement sleeve surrounding said transition duct and spaced a distance therefrom to form a flow volume therebetween;

    a plurality of apertures in said impingement sleeve;

    each of said plurality of apertures having an area;

    adjacent ones of said plurality of apertures being separated by a spacing;

    a closed end at a turbine end of said flow volume;

    an exit at a combustor end of said flow volume;

    a flow sleeve within the compressed air-plention surrounding said combustor;

    a flared entry portion at an end of said flow sleeve overlapping said exit and forming an aerodynamic converging shape therebetween;

    a flow of air through said aerodynamic converging shape flowing toward said combustor being effective to reduce a pressure at said exit below a pressure in said compressed air plenum whereby a pressure drop across said impingement sleeve produces an impingement jet of air from each of said plurality of apertures directed toward said transition duct; and

    at least one of said distance, said area and said spacing being non-uniform over said impingement sleeve to control a cooling in said surface.

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