Turbulent nonreacting swirling flows

Numerical results for incompressible confined swirling flows in a model combustor were obtained using the k-epsilon and k-l models of turbulence developed by Ramos (1980, 1981). Calculations were performed for a model combustor consisting of a 3.43-cm diameter inner pipe and a 14.5-cm diameter outer pipe. The outside diameter of the inner pipe is 3.86 cm. It is shown that the k-epsilon model does predict a recirculation zone for both coswirl and counterswirl flow conditions if suitable inlet conditions are used. Both turbulence models predict a nonexistent recirculation zone under coswirl conditions. The calculated mean axial and tangential velocity profiles are compared with the experimental data of Vu and Gouldin (1980).