Film cooling and heat transfer from a combination of two rows of simple and or compound angle holes in inline and or staggered configuration

This paper describes the results of an experimental investigation into the film cooling effectiveness and heat transfer characteristics of two stagger ed injection rows of either a combination of one row of simple angle holes with another row of compound angle holes or with both rows of compound angl e holes. The effect of using various injections holes arrangements as well as the relative location of the compound angle holes row to the simple angl e holes row have been investigated for different blowing rates. Using combi nation of one row of downstream compound angle holes with another upstream simple injection holes row provides a significant increase in the film cool ing protection over a flat plate surface, over that obtained from either tw o rows of only simple injections holes or compound angle holes.