12th European Conference on Turbomachinery Fluid dynamics & Thermodynamics
Cooling air can be chilled for industrial gas turbines. By taking advantage of this feature, a deep digging fan-shaped film cooling hole equipped the function of a trench has been devised. The characteristics of this film cooling hole were investigated using quantitative measurement methods. It was revealed that this film cooling hole had high film cooling effectiveness at high mass flux ratio M of 11.5. It was also revealed that film cooling effectiveness could be greatly improved when the film cooling air was swirled. Cooled turbine blades may be manufactured with the additive manufacturing method in the future, and the relationship between the positions of the film cooling hole and internal cooling structure can determined. In this case, it becomes possible to design turbine blades utilizing the swirling flow generated by the internal cooling structure to attain high film cooling effectiveness.