Abstract
Film cooling characteristics has been examined numerically for the height variation of a stepped slot exit. In this study, the upstream wall height of the stepped slot exit from -2d (d=slot width) to 3d, blowing ratio ranges from 0.5 to 3, and injection angles are 15˚, 30˚, and 45˚. The results showed that film cooling performance was mainly subjected to the magnitude of recirculation region near the downstream-side slot exit as well as the mangitude and the distribution region of turbulent kinitic energy due to the local velocity and momentum defferences between the coolant and the main flow near the slot exit. The up-ld type slot at higher blowing ratios over 2 and the flat type slot at lower blowing ratios below 1 have the best film cooling performances, in case of the injection angles of 30˚ and 45˚, respectively. Compared with the other injection angles, in case of the injection angles of 15˚, the best film cooling performances was shown in even a higher upstream wall (up-3d) at higher blowing ratio like 3 by the gradual reduction of the coolant velocity which minimized the local velocity differences between the coolant and the main flow near the slot exit.
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