A computational and experimental investigation of turbulent jet and crossflow interaction

The flowfield induced by a single circular jet exhausting perpendicularly from a flat plate into a crossflow has been investigated numerically. The flow regime investigated corresponds to that encountered in a modern gas-turbine combustor. Reynolds-averaged solutions were obtained using a pressure-based Navier-Stokes solver: The standard k-epsilon turbulence model with and without nonequilibrium modification was employed. Two different momentum pur ratios, J, between the jet and the fr ee str earn are investigated, namely, J = 34.2 and J = 42.2. To aid the evaluation of the computational capability, 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 noticeably better job than the fir sf-order scheme to predict the velocity profile at the jet exit while predicting less mixing than the experimental measurement during the jet and free stream interaction. It appears that turbulence modeling primarily is responsible for the deficiency the accounting for the physics of the jet and free stream interaction.