engleski

Effect of Combined Hole Configuration on Film Cooling

Turbine blades operate under a harsh environmental condition, and the inlet temperature of gas turbines is increasing with requirement of high engine efficiency. Some cooling schemes are adopted to prevent the blades from the thermal erosion of the hot mainstream. Film cooling technology is used widely and effectively in gas turbines. The coolant air is suppressed to the wall by the mainstream after jetting out of the film hole. A new hole configuration was first proposed to improve the film cooling characteristics in this paper. Comparison between the conventional cylindrical hole and the new combined hole was conducted by computational fluid dynamics, and an effect of various blowing ratios were also investigated. Results show that the film cooling effectiveness for the combined hole configuration is higher than the conventional cylindrical hole, because the attachment from the coolant flow to the wall is weak at a high blowing ratio.

Film cooling ; combined hole ; computational fluid dynamics ; gas turbine ; blowing ratio

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