A numerical evaluation on the effect of sister holes on film cooling effectiveness and the surrounding flow field |
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Authors: | Marc J Ely B A Jubran |
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Institution: | (1) Aero-Thermal Management Laboratory, Department of Aerospace Engineering, Ryerson University, 350 Victoria St., Toronto, ON, M5B2K3, Canada |
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Abstract: | A numerical study was performed to evaluate the effectiveness of the novel sister hole film cooling technique. Two secondary
coolant holes bound the primary coolant hole slightly downstream of its midpoint, intended to minimize the primary vortex
pair and improve cooling performance. An unstructured hexahedral mesh was generated and the realizable k–ε turbulence model with near-wall modeling was used in these simulations. Blowing ratios of 0.2, 0.5, 1.0, and 1.5 were simulated
to evaluate the applicability of sister holes in practical applications. It was found that sister holes significantly improved
cooling performance over the entire computational domain, particularly at high blowing ratios. These results arose by countering
the primary vortex pair with a secondary pair from these sister holes, ultimately maintaining flow adhesion where the coolant
stream would have otherwise separated. |
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Keywords: | |
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