Application of algebraic anisotropic turbulence models to film cooling flows

The complex structures in the flow field of gas turbine film cooling increase the anisotropy of turbulence making it difficult to accurately compute turbulent eddy viscosity and scalar diffusivity. An algebraic anisotropic turbulence model is developed while aiming at a more accurate modeling of the Reynolds stress and turbulent scalar flux. The developed algebraic anisotropic turbulence model is validated by a classic film cooling experiment and further verified by a series of in-house experiments with different hole geometries, density ratios and blowing ratios. On one hand, the anisotropic eddy viscosity method improves the modeling of Reynolds stress and the predictive flow field. On the other hand, the anisotropic turbulent scalar-flux model includes the role of anisotropic eddy viscosity in modeling of scalar flux and improves the turbulent scalar flux prediction. Compared with the experimental results, the algebraic anisotropic turbulence model is available and accurate quantitatively. The algebraic anisotropic turbulence model is prospective to improve the RANS predictive capability of film cooling.