Abstract
Turbulent jet flows with noncircular nozzle inlet are investigated by using a Reynolds Stress Model. In order to analyze the effects of noncircular inlet, the cross section of inlet are selected as circular, square, and equilateral triangular shape. The jet half-width, vorticity thickness, and developments of the secondary flow are presented. From the result, it is confirmed that the secondary flows of square and equilateral triangular nozzle are more vigorous than that of the circular jet. This development of secondary flows is closely related to the variations of vortical motions in axial and azimuthal directions.
Highlights
Turbulent jets are primary flow structures in many applications such as jet pumps, ejectors, jet propulsions and combustors etc
We understand that the flowfields of noncircular jets have the flow structures depending on the inlet nozzle configuration
It is observed that the location of maximum Sec for the triangular jet is the closest to the inlet plane. This means that the radial flow structure of the triangular jet is quickly changed to an asymmetry pattern
Summary
Turbulent jets are primary flow structures in many applications such as jet pumps, ejectors, jet propulsions and combustors etc. Previous studies were conducted on the turbulent flow of a jet issuing from differrently shaped nozzles [1,2,3,4,5]. From their results, it was found that the near-field flow of the jet is strongly influenced by the three-dimensional structure dependent on the loss of axisymmetric nature. The above two factors are strongly related to non-circular jet flows near the injection plane Such flow structure can affect the mixing characteristics and turbulent structures. The results are discussed with the flow mixing and peculiar characteristics of three jet flows
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