Realizable eddy-viscosity turbulence models in turbulent reacting flows.

摘要: The quality of two-equation eddy-viscosity models is studied for non-premixed turbulent gas combustion in an axisymmetric co-flow burner. Non-linear extensions low-Reynolds versions turbulence have been made. Both k − e and −ω based are studied. First order non-linearity the constitutive law Reynolds stresses has introduced on basis realizability. Realizability obtained by introducing a dependency local flow velocity gradients. main advantage non-linear that they describe flowfield more accurately than their linear counterparts without rather 'ad hoc' adjustments model constants. Differences between results from high-and small cases Results presented free jet, followed inert mixing jet. Finally, reacting jet given. realizable always provide best results.