Abstract
Described in this paper is a numerical investigation on the concept for improving film cooling performance with backward injection by placing the ramp upstream the film hole. Eight different geometry models are investigated, including the cases with backward injection angles of 30°–90° and the distances between the upstream ramps and film holes (upstream distances) of 5–15 mm. The effect of backward injection angles and upstream distances on film cooling performance is evaluated at the density of 0.97 with the blowing ratios ranging from 1.0 to 2.0. Results obtained show that film cooling performance with backward injection is greatly improved by an upstream ramp, especially in the region downstream the film hole. Both the downward vortex and coolant entrainment are observed in the case of film cooling with backward injection and an upstream ramp. The dual effect of the downward vortex and coolant entrainment dramatically promotes the film cooling performance. Furthermore, the lateral adiabatic cooling effectiveness declines with the increase of backward injection angles and also declines with the increase of the upstream distances.
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