Numerical Study on the Influence of Hole Shape on Film Cooling Effectiveness

Abstract:

Effects of hole shapes on film cooling effectiveness downstream of one row of film holes at the blade were investigated using a three-dimensional finite volume method and multi-block technique. The present study also received velocity vectors about different hole shapes. The hole geometries studied include standard cylindrical hole and forward diffused shaped hole and converging slot-hole. It was found that the film cooling effectiveness of cylindrical holes obviously declined along with increasing the blowing ratio. Results of the shaped holes configuration present a marked improvement, with a high effectiveness at the lateral area between adjacent holes and effectiveness of the converging slot-hole was superior to other holes in various blowing ratios. The film cooling effectiveness realized by the slot-holes compared to the cylindrical and forward diffused shaped holes was more excelled at downstream of the intersection of the two slot-holes. The converging slot-hole and forward diffused shaped hole can reduce the vortex intensity, and then enhance the film cooling effectiveness.

• Periodical: Advanced Materials Research (Volume 716)
• Pages: 699-704
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.716.699
• Online since: July 2013
• Authors: Ping Dai, Nai Yun Yu
• Keywords: Converging Slot-Hole, Film Cooling Effectiveness, Mechanical Engineering, Numerical Simulation, Power Engineering, Turbine Blade, Turbulence Model

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