Claims
- 1. 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.
- 2. A combustor liner according to claim 1 wherein the combustor liner includes at least a pair of generally annular ribs spaced from one another and projecting in a direction away from said opposite surface, said ribs defining a generally annular and generally smooth area therebetween, said coating overlying one of said pair of ribs and said smooth area.
- 3. A combustor liner according to claim 2 wherein said coating overlies said pair of ribs.
- 4. A combustor liner according to claim 2 wherein said coating overlies said smooth area.
- 5. A combustor liner according to claim 2 wherein said coating overlies said pair of ribs and said smooth area.
- 6. A combustor liner according to claim 1 wherein said rough surface has a centerline roughness value of 0.1-10 mils.
- 7. A combustor liner according to claim 1 wherein said rough surface has an average peak-to-valley distance in a range of in excess of 1 mil and less than 100 mils.
- 8. A combustor liner according to claim 1 wherein said rough surface has an average peak-to-valley distance in a range of in excess of 2 mils and less than 50 mils.
- 9. A combustor liner according to claim 1 wherein the particulate material has an average particle size of about 180 microns to about 600 microns.
- 10. 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.
- 11. A combustor according to claim 10 wherein said rough surface has an average peak-to-valley distance in a range of in excess of 2 mils and less than 50 mils.
- 12. A combustor according to claim 10 wherein the particulate material has an average particle size of about 180 microns to about 600 microns.
Parent Case Info
This application is a divisional of application Ser. No. 09/783,704, filed Feb. 14, 2001, the entire content of which is hereby incorporated by reference in this application.
US Referenced Citations (10)