Parametric Study of Combustor Machined Ring Film-Cooling with TBC

摘要

Through the set up of a calculation model on film cooling in the primary zone of an annular combustor, a parametrical study was made on the relationship of film cooling effectiveness and wall temperature with configuration parameters such as cooling slot height and TBC thickness. Through parametrical study, it can be seen that with all the parameters kept the same and even the resulting effectiveness of the outer liner slightly greater due to a slightly higher blow ratio, the outer liner temperatures are considerably higher than the inner liner temperatures. The calculation shows, with cooling effectiveness, there are optimum values of coolant injection angle and film cooling slot height, while there is a monotonous tendency for the relationship of cooling effectiveness with other parameters such as tapered angle on nugget lip, starting edge angle at nugget-slot exit and lip thickness.The study demonstrates that the higher the TBC thickness, the lower the highest value of base metal temperatures, but when the TBC thickens, it becomes heavier, and the possibility of TBC spallation gets greater.