Overall Cooling Effectiveness of Effusion Cooled and Thermal Barrier Coated Swirl Stabilized Liquid Fueled Combustor Liner in Reacting Flow Conditions With Infrared Thermography

Effusion cooling and thermal barrier coating have a crucial ability to cool down modern combustor liners and keep metal temperature below material maximum service temperature. Therefore this method has enabled high combustion temperature, which leads to powerful and more efficient gas turbine engines over the last decades. Effusion cooling method is obtained by arrays of holes settled all over a combustor liner to generate a uniform film layer at the hot gas side. Coupling of effusion cooling and thermal barrier coating provides high cooling effectiveness and low amount of coolant demand. In this paper, experimental results of an effusion cooled and thermal barrier coated (TBC) combustion liner are presented. The rig was liquid fueled and swirl stabilized, in order to generate engine like reacting conditions. In this study, the overall cooling effectiveness of the liner has been examined under rich fuel conditions in different coolant-to-main air ratios. The combustion liner of a can combustor was laser drilled to provide 25 degrees inclined holes for an effective effusion cooling scheme. Thermal Barrier Coating has been applied equal to 40% off metal thickness of the liner. The effusion cooling scheme has been formed to have dense staggered array with s/d = 9. Infrared Thermography (IRT) was employed to measure the liner metal temperature and overall cooling effectiveness values were identified.