Abo Bibliothek: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Numerical Simulation for the Effect of Density Ratio on the Film Cooling Using the k − ε − v'2 Model

Get access (open in a dialog) DOI: 10.1615/IHTC12.1040
6 pages

Abstrakt

A numerical simulation was performed to investigate flow and heat transfer characteristics of film cooling flow by injection through a row of holes. The finite volume method was employed to discretize the governing equation based on a non-orthogonal coordinate system with a non-staggered variable arrangement. The k − ε − v'2 turbulence model was adapted to consider the wall proximity and nisotropic effect. The results of the numerical simulations were compared with the experimental data and with the results of the standard k − ε turbulence model to validate the numerical modeling. The results of the k − ε − v'2 turbulence model showed better agreement with the experimental data than the standard k − ε turbulence model. In order to analyze flow and heat transfer characteristics, a variety of scalar quantities as well as film cooling effectiveness were calculated with various blowing ratios(M=0.5~2.0), density ratios(ρj =1.2~2.0), injection angles(α=35, 90°) at a fixed hole length-to-diameter(L/D=3.5). For high blowing ratios, the film cooling effectiveness was very sensitive to variation of the density ratio at the same blowing ratios.