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| Review on Advanced Film Cooling Hole Shapes |
| WANG Haitao, ZHANG Wenwu, GUO Chunhai |
| (Zhejiang Provincial Key Laboratory of Aeroengine Extreme Manufacturing Technology, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China) |
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Abstract The film cooling technologies can significantly improve the high temperature resistance of turbine blades. This paper focuses on film cooling technology, compares hole shapes at home and abroad, introduces the mechanism of the interaction between the main stream and the secondary flow, analyzes the influence of the cooling gas distribution on the film quality, and summarizes the effect of film cooling technology on aero-engine performance. A detailed discussion is carried out from the interactive flow field, hole shapes, hole accessory structure (tabs, slopes) and hole arrangements. There are four main routes for improving the cooling efficiency: (1) Reducing the strength of the kidney vortex; (2) Producing a pair of anti-kidney vortices; (3) Using groove structure; (4) Changing the outlet pressure distribution. Through the discussion and analysis of the hole shapes and accessory structures, it could provide guiding ideas for the optimal design of film cooling holes.
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2021, 
