Influence of film cooling jet inlet boundary condition on large eddy simulation of model turbine blade leading edge

摘要

The present paper investigates the influence of film cooling jet inlet boundary condition (IBC) on the large eddy simulation (LES) of film cooling in a model turbine blade with a curved leading edge. Four different IBCs comprising: 1) uniform flow; 2) time independent fully developed turbulent flow and time dependent fully developed turbulent flow perturbed by the vortex method applying two turbulence intensities of 2% and 7% are employed. Results show that accuracy of LES predictions is greatly reliant on coolant jet IBC and case (4) illustrates the best agreement with experiment whilst other cases over-predict the adiabatic effectiveness. Also, film cooling jet IBC not only has a significant influence on flow field vortical structures, but also influences the entrainment and mixing of cold and hot flows. Additionally, the capability of the vortex method for producing a time dependent IBC in leading edge film cooling application is examined and confirmed.