Abstract
Film cooling effectiveness and discharge coefficient of cylindrical holes fed by different internal cross-flow channels with varying cross-flow Reynolds numbers are investigated. Three cross-flow cases—a smooth case and ribbed cases with 135-deg ribs and 45-deg ribs—are studied at three blowing ratios and two . Film cooling effectiveness contours are obtained by the transient liquid-crystal measurement technique. For the smooth case and 45-deg case, the asymmetrical vortex is more pronounced with increasing cross-flow direction velocity, resulting in more skewed film coverage at and . Helical motion within the film hole for the 45-deg case is more violent. On the contrary, laterally symmetric film-coverage contours are displayed for the 135-deg case, and the film cooling effectiveness at decreases slowly as flowing downstream. The influence of on lateral distribution is greater at . The lateral spread of film coverage at is wider than that at . At , there is almost no film coverage in the downstream region at . The jet is relatively attached greater to the surface, thus producing positive influence on the film cooling effectiveness at . The hole-exit velocity contour on the side mainly affects film coverage. The discharge coefficient increases as increases. The 45-deg case is the lowest, whereas the 135-deg case is the highest.
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