Method and apparatus for enhancing heat transfer in a combustor liner for a gas turbine
AssigneeGeneral Electric Company
InventorsRobert Alan Johnson, Anthony Joseph Loprinzo, Ching-Pang Lee, Nesim Abuaf, Wayne Charles Hasz, Harmon Lindsay Morton
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Abstract
A combustor liner is provided on its backside cooling surface with a braze alloy coating and cooling enhancement material, preferably metallic particles to enhance the heat transfer between the liner and the cooling medium. The surface area of the backside coated area is increased substantially by the coating and particles in relation to the uncoated surface areas. Consequently, the life of the liner is extended.
Claims12
A combustor liner having a cooling surface and an opposite surface for exposure to a high temperature fluid medium comprising:
- a coating overlying said cooling surface forming a coated surface having a coated surface area in excess of said surface area of said cooling surface uncoated to afford enhanced heat transfer from the combustor liner to a cooling medium along the coated surface relative to the heat transfer from the combustor liner to the cooling medium without the coating, said coating including a braze alloy including particulate cooling enhancement material forming a plurality of protuberances projecting from said cooling surface, said protuberances forming a rough surface having a centerline roughness value of 0.1-25 mils.
A combustor for a turbine comprising:
- a combustor liner having a cooling surface and an opposite surface for exposure to a high temperature fluid medium within the combustor liner;
- a coating overlying said cooling surface forming a coated surface having a coated surface area in excess of said surface area of said cooling surface uncoated to afford enhanced heat transfer from the combustor liner to a cooling medium along the coated surface relative to the heat transfer from the combustor liner to the cooling medium without the coating;
- said coating including a braze alloy including particulate cooling enhancement material forming a plurality of protuberances projecting from said cooling surface, said rough surface having an average peak-to-valley distance in a range of in excess of 1 mil and less than 100 mils.
Dependencies are inferred from the claim text.