The paper presents an application of the two-equation k-e model to the problem of three-dimensional free jets issuing from rectangular orifices. The turbulence model has been modified so that plane and round jets may be predicted with the same empirical input. The continuity, momentum, and turbulence equations are solved using the fmite difference procedure of Patankar and Spalding for three-dimensional parabolic flows and results are presented for aspect ratios of 1,5,10, and 20. The decay of axial velocity is well predicted. The behavior of the half-widths, however, is not well predicted when no lateral velocities are specified at the orifice; the measured crossover of jet major and minor axes is not obtained. The possible existence of a lateral velocity field at the orifice cross section is examined and its ability to produce the observed jet inversion is demonstrated. ProfIle shapes in the orifice short-axis direction are in good agreement with measurements, and, when inlet lateral velocities are specified, the long-axis profIles are also predicted fairly well. The measured "saddle-shape" of the profIles in this direction is, however, not obtained; this will require further changes to the turbulence model.
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