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Effect of film hole diameter to discharge coefficients and film cooling  effectiveness of the lamilloy were experimentally investigated at the  blowing ratios ranging from 0.6 to 2.5. Generally, the cooling effectiveness  on the test surface is increased with the film hole diameters and blowing  ratios increasing, and the variation tendency along the stream wise through  the centerline of film holes also keeps consistent. In the upstream, all  configurations have a relatively lower cooling effectiveness, however, with  the flows to the downstream, cooling effectiveness grows gradually, and the  peak values of effectiveness appeared periodically, the position matches the  film hole positions. Besides, between the film holes, fluctuation exists  simultaneously. By comparison, the cooling effectiveness and discharge  coefficients are both increased with the blowing ratio with same film hole  diameters, Moreover, under the same blowing ratios, the cooling  effectiveness and discharge coefficients are getting higher when hole  diameters increase.

Experimental investigation of geometrical effect on flow and heat transfer performance of lamilloy cooling structure