Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13087/3443
Title: Numerical investigation of area ratio on sister hole applications at a constant exit area
Authors: Sezgin, Fırat
Yasa, Tolga
Keywords: Film cooling
sister holes
cooling effectiveness
heat transfer
turbine cooling
Film-Cooling Effectiveness
Fan-Shaped Hole
Detailed Analysis
Streamwise Injection
Performance
Geometry
Physics
Density
Issue Date: 2022
Publisher: Sage Publications Ltd
Abstract: A numerical study was performed to investigate the effect of the area ratio at sister hole applications on film cooling effectiveness and flow structure. Two secondary coolant holes are placed on both sides of the main hole at a lateral distance of one main hole diameter. Four different area ratios (AR = 2-5) between the main hole and sister hole were studied. A single cylindrical hole was also studied for comparison and baseline. The structured mesh was generated and realizable k-epsilon turbulence model with scalable wall function was used in these simulations. Blowing ratios of 0.25, 0.50, 0.80, and 1 were simulated to evaluate the effect of sister holes in practical applications. The centerline cooling effectiveness and laterally averaged cooling effectiveness are studied as well as temperature contours and streamlines at two different streamwise locations (x/D = 1 and x/D = 3). The area ratio on sister hole application has an important effect on cooling effectiveness as the sister hole exit area affects the Anti- Counter Rotating Vortex intensity (A-CRVP vorticity) and size. The positive effect of the sister hole is more pronounced with the increasing blowing ratio. Lower are ratios such as AR = 2 and AR = 3, decrease the vorticity of the CRVP around %30 which directly affects the cooling effectiveness. The results of this study showed area ratio, as well as lateral distance between main hole and sister hole centers heavily affects the cooling effectiveness, the lower area ratios are more efficient for film cooling.
URI: https://doi.org/10.1177/09544062221116314
https://hdl.handle.net/20.500.13087/3443
ISSN: 0954-4062
2041-2983
Appears in Collections:Makine Mühendisliği Bölümü Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu
WoS İndeksli Yayınlar Koleksiyonu

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