First Hybrid Turbulence Modeling for Turbine Blade Cooling

摘要

The first detached eddy simulation of film cooling has been presented for a widely published plate-pipe configuration. The blowing ratio was unity and density ratio was two. Results indicate that the mixing processes downstream of the hole are highly anisotropic. DES solution shows its ability to depict the dynamic nature of the flow and capture the asymmetry present in temperature and velocity distributions. Further, comparison between experimental and DES time-averaged effectiveness is satisfactory. Numerical values of cen-terline and span-averaged effectiveness differ from those of experimental values at downstream locations. Smaller values of numerically predicted spanwise effectiveness than the experimental data might be caused by the improper turbulence model in the spanwise spreading of the jet. This needs to be investigated in the near future.