Numerical simulation of film cooling in reactive flow over a surface with shaped coolant hole

Numerical simulation of film cooling in reactive flow over a surface with shaped coolant hole Conference

Lin, CX, Holder, RJ, Thornburg, H et al. (2009). Numerical simulation of film cooling in reactive flow over a surface with shaped coolant hole .

Lin, CX; Holder, RJ; Thornburg, H; Sekar, B; Zelina, J; Anderson, W; Polanka, MD; Stouffer, SD; Briones, A

Film cooling plays a critical role in providing effective thermal protection to components in modern gas turbine engines. Most of the previous computational studies on film cooling were conducted using cylindrical or shaped coolant holes with pure cross stream air flow. In this paper, the reactive turbulent flow film cooling over a surface with shaped coolant hole is investigated by a Reynolds-Averaged Navier-Stokes (RANS) approach with a Shear-Stress Transport (SST) k-ω turbulence model to simulate the turbulent flow. To take into account the secondary combustion that resulted from the unburned fuels in the cross stream flow, a two-step reaction scheme was used for the combustion process of propane. An eddydissipation concept (EDC) approach was used to account for the turbulence-chemistry interaction. The three-dimensional simulation was performed on an unstructured hybrid grid. The characteristics of reactive flows, species transport, and the film cooling effectiveness with shaped coolant hole were investigated at different equivalence ratios and blowing ratios. Numerical results reflected the experimental data in terms of quantifying the conditions that result in reactions and the relative temperature change between air and N2 injections. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc.