In order to study the effect of tab on film cooling

three kinds of test pieces with different geometrical parameters were designed

and the heat transfer characteristics of them were experimentally studied.The results show that the convective heat transfer coefficient of film cooling with tab is better than that without the tab.While the area ratio is 0.1

the convective heat transfer coefficient of film cooling is the best at the blow ratio of 0.50.78;while the area ratio is 0.27

the convective heat transfer coefficient gets its maximum value at the blow ratio of 1.221.5.However

because of the existence of tabs

the flow friction loss in the film hole will be increased.