バックステップを有するフィルム冷却の不確かさ評価

抄録

This paper compares two back step film cooling configurations under an uncertainty quantification framework. For the back step configurations, a straight and a curved step are used. Detached eddy simulations with k-ω SST turbulence model are performed using OpenFOAM ver 4.0. Effects of the steps on the film cooling effectiveness is investigated at the step height of 0.5d, 0.75d and blowing ratio of BR=0.5, 1.0, where d is a film cooling hole diameter. Although higher film cooling effectiveness is obtained with the curved step compared to the straight step, the difference is small and it is not clear which step type shows better film cooling performance. Therefore, uncertainty quantification analysis is performed using SAMBA code. The UQ analysis shows that the curved step type can achieve higher film cooling effectiveness than the straight step type against the variation of the step height, blowing ratio and density ratio.