Numerical Investigation of the Impact of Hole Geometry on the Impingement Heat Transfer Characteristics

This paper describes a numerical investigation of an impingement cooling scheme which is employed to cool the leading edge region of a high-pressure Turbine blade. The CFD study examined the impact of the impingement hole geometric configuration on the heat transfer coefficient distribution. Two impingement hole configurations were investigated, namely round and race-track shaped holes with the jet Reynolds number equal to 10,000, for both configurations. The merits of three different turbulence modeling schemes were investigated, namely realizable k-ε, SST k-ω and v2-f models. The numerical results revealed that (i) the race-track shaped hole produced higher levels of impingement heat transfer coefficients compared to round shaped hole at the same jet Reynolds number (ii) the numerical results with the v2-f turbulence model were in a better agreement with the data from open literature than the other two turbulence models.