Özet:

Abstract Computational analysis of film cooling effectiveness from two rows of holes inclined with 30o on a flat surface in case of in-line and staggered arrangements has been carried out. The upstream row is supplemented with anti-vortex holes. The addition of anti-vortex holes is presented as a new technique depends on adding two cylindrical holes branching out from the main holes. Three different positions of anti-vortex holes are studied with three different values of velocity ratios. The study is carried out using realizable k-ϵ model in FLUENT commercial code. The numerical model is verified by comparing a single row of film cooling holes results with available experimental works in literature. The results ensure that the staggered arrangement gives higher film cooling effectiveness than the in-line one for all studied velocity ratios. The use of anti-vortex holes increases the film cooling effectiveness. The position of anti-vortex holes shows a significant effect, especially with high velocity ratios. References R. J. Goldstein, E. R. G. Eckert, V. L. Eriksen, and J. W. Ramsey, “Film cooling following injection through inclined circular tubes,” Israel Journal of Technology, vol. 8, no. 1-2, pp. 145-154, 1970.

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