A computational and experimental investigation of turbulent jet and crossflow interaction

The flowfield induced by a single circular jet exhausting perpendicularly f rom a flat plate into a crossflow has been investigated numerically. The fl ow regime investigated corresponds to that encountered in a modern gas-turb ine combustor. Reynolds-averaged solutions were obtained using a pressure-b ased Navier-Stokes solver: The standard k-epsilon turbulence model with and without nonequilibrium modification was employed. Two different momentum p ur ratios, J, between the jet and the fr ee str earn are investigated, name ly, J = 34.2 and J = 42.2. To aid the evaluation of the computational capab ility, experimental information also has been obtained, including mean and root-mean-square (RMS) velocity distribution downstream of the jet, and the detailed velocity profile at the jet exit. An evaluation of the different convection schemes reveals that the second-order upwind scheme does a notic eably better job than the fir sf-order scheme to predict the velocity profi le at the jet exit while predicting less mixing than the experimental measu rement during the jet and free stream interaction. It appears that turbulen ce modeling primarily is responsible for the deficiency the accounting for the physics of the jet and free stream interaction.