Abstract
An attempt has been made to predict the mean velocity field of turbulent jets immersed in secondary streams confined by constant-area ducts. The calculations have employed empirical data derived solely from the turbulent free jet. The conditions under which ducted jets may be considered approximately self-preserving have been examined by comparison of results of momentum-integral calculations with data from various sources on two-dimensional and axisymmetric jets immersed in secondary streams of constant velocity. For flows in which confining walls have significant effects, it is shown that the velocity field may be determined fairly well from free-jet data using the assumption of approximate self-preservation. Before the jet spreads to the wall, both the mean-velocity and turbulent shear stress are assumed self-preserving. Afterward only the shear stress is subject to this condition. Improvement of the methods used appears mainly to require a better model of the zone of recirculation.
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