An annular jet has been created by supporting a streamlined plug (dia = D1) in a delivery tube (dia = D2) with a narrow cross-member. PIV measurements have been carried out at x/D2 = 8 for four D1/D2 ratios. These observations, and the motivating criteria for this study, were used to select D1/D2 = 0.746 for detailed, near exit, velocity field measurements. Significant three-dimensional effects of the cross-member have been observed. Velocity field data, from a “sting supported, flat disk” (axisymmetric geometry) central plug provide comparative measurements. These comparisons are considered in detail.

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