RT Journal Article ID 35ec2b7320757be1 A1 Shan, Yong A1 Zhang, Jing-zhou T1 NUMERICAL INVESTIGATION ON FILM-COOLING CHARACTERISTICS FROM A ROWOF HOLES WITH RIDGE-SHAPED TABS JF Journal of Enhanced Heat Transfer JO JEH(T) YR 2013 FD 2013-10-18 VO 20 IS 3 SP 251 OP 265 K1 cooling effectiveness K1 discharge coefficient K1 displaced enhancement device K1 single-phase flow K1 gas turbine AB A three-dimensional numerical simulation was conducted to investigate the enhanced cooling performances caused by ridge-shaped tabs located at the upstream edge of film-cooling holes. Three covering ratios of ridge-shaped tabs on the film holes and four blowing ratios were considered in the present study. By comparison with cylindrical holes (a baseline case), the presence of ridge-shaped tabs in the nearby region of the primary film-cooling holes mitigates the primary vortices due to the mainstream/coolant-jet interaction and transfers the coolant-jet momentum flux mainly in the streamwise direction. The coolant-jet penetration along the vertical direction is suppressed and the peak velocity along the streamwise direction is augmented under the action of the ridge-shaped tabs, providing an increment in the film-cooling effectiveness and enhancement of the heat transfer coefficient over the baseline case. The ridge-shaped tabs provide enhancements in the cooling effectiveness but at the expense of a large pressure drop. From the present study, it is suggested that a ridge-shaped tab with a middle covering ratio is the best choice. PB Begell House LK https://www.dl.begellhouse.com/journals/4c8f5faa331b09ea,7ad28e2d298590f0,35ec2b7320757be1.html