Abstract
In this paper, dynamic and thermal aspects of highly heated subsonic plane and circular jets flowing into a weak co-flow stream are numerically investigated. The two studied nozzle exit shapes have identical cross-sectional area and so equal equivalent diameter. Simulations are performed using the second order Reynolds Stress Model (RSM). The concordance between code predictions and experimental results is reasonably good. The centerline evolutions of velocity and temperature field are analyzed. It is shown that the mean centerline velocity and temperature decays are more rapid, the fluctuating quantities grow faster and the momentum and thermal half-widths are higher for the plane jet than for the circular jet. Moreover, higher values of entropy generation rate and Merit number correspond to non-circular jet. These results show that the breakdown of the axisymmetry at the exit of the jet together with heating the homogeneous jet enhance the mixing and the entrainment rates between the jet and its surrounding.
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