TS-79 Effects of Orientation Angles on Film Cooling over a Flat Plate : Heat Transfer Coefficient Ratio and Heat Flux Ratio(Session C-9 Turbine Cooling 1)

概要

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An experimental study has been conducted to investigate the effect of orientation angles of film cooling holes on the film cooling performance. Four orientation angles of 0°, 30°, 60°, and 90° at a fixed inclination angle of 35°, and three velocity ratios of 0.5, 1.0, and 2.0 were considered. Detailed heat transfer coefficient distributions were measured with thermochromic liquid crystal. The distributions of the heat transfer coefficient ratio are presented, and the film cooling performace is evaluated in terms of the heat flux ratio. Results show that the heat transfer coefficient increases with the velocity ratio though the extent of the orientation angle effect on the heat transfer coefficient ratio varies with the velocity ratios. The compound angle injection provides better performance than the simple angle injection at all velocity ratios. The 30° compound angle injection shows better performance at the velocity ratio of 0.5. At the velocity ratio of 1.0. however, the 90° injection shows best performance. The reduction of thermal load due to film cooling is negligible at the velocity ratio of 2.0 regardless of the orientation angles.
公益社団法人日本ガスタービン学会の論文
1999-11-14