Abstract
Numerical simulations of the isothermal turbulent jets mixing flows exhausted from two different circular lobed nozzles are presented in the present paper. The numerical studies have been conducted using a Favre-Reynolds Averaged Navier-Stokes approach, using the second-order Reynolds Stress Model (RSM ) and structured mesh. The validation of the numerical results with experimental data has been carried out only with one nozzle for the same configuration. This comparison shows reasonable agreement, principally, in terms of centreline longitudinal velocity, longitudinal fluctuating velocity and streamwise vorticity. In the second part, the effects of the inlet isothermal lobed jet on the mixing process with variable density have been studied numerically. For the same area exit geometries (axisymmetric and asymmetric), a qualitative comparison of the numerical results with experimental data have been presented. All these indicated the better mixing enhancement performance of a lobed nozzle over asymmetric and axisymmetric nozzles respectively.
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