RT Journal Article ID 41a33ce533b2c9b0 A1 Halder, Paresh A1 Samad, Abdus A1 Kim, Jun-Hee A1 Kim, Kwang-Yong T1 FILM-COOLING CHARACTERISTICS OF UPSTREAM RAMP ENHANCED TURBINE BLADE SURFACE COOLING JF Heat Transfer Research JO HTR YR 2017 FD 2017-10-10 VO 48 IS 11 SP 969 OP 984 K1 upstream ramp K1 film cooling K1 turbine blade cooling K1 heat transfer AB Film cooling is widely used in high-performance gas turbines to reduce the surface heat flux. Placing a ramp upstream of a film-cooling hole improves the film-cooling effectiveness. In this work, the Reynolds-averaged Navier−Stokes equations with the k−ω SST model are solved to simulate heat transfer and fluid flow over an upstream ramp and two rows of injection holes. Three blowing ratios (M = 0.6, 1.0, and 1.6) and three upstream ramp angles (α = 0, 14° to 24°) are tested. It is found from the investigation that the film-cooling effectiveness increases with the upstream ramp angle and blowing ratio. Higher film-cooling effectiveness is noticed downstream of the second row holes than that of the upstream holes in the case without a ramp. PB Begell House LK https://www.dl.begellhouse.com/journals/46784ef93dddff27,11a0dcd27ac6ab7d,41a33ce533b2c9b0.html