抄録
Recent advanced film-cooling techniques tend to be multipurpose, e.g. cooling and flow control, and therefore the total performance is difficult to be evaluated. This paper has proposed a numerical method to estimate local rate of mean entropy generation based on the flow statistics obtained by large eddy simulation. The method is applied to evaluate the effectiveness of a novel film cooling concept, which not only cools the endwall region upstream a leading-edge of turbine vane but also suppresses the formation of horseshoe vortex, which is known to be responsible for overheating and aerodynamic losses by the legs of the vortex downstream. As a result, it is clearly suggested that the film coolant injection upstream the leading edge has a potential both to cool the enwall and to reduce aerodynamic losses simultaneously.
