Experimental investigation of geometrical effect on flow and heat transfer performance of lamilloy cooling structure
2020
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.
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