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In light of recent renewed interest in streaks in turbulent jets, the currentwork explores their coexistence with vortex rings in the near field ofturbulent round jets. A Reynolds number, $Re=1.5 \times 10^5$ jet is studied attwo diameters downstream of the nozzle, using high-speed stereo particle imagevelocimetry. The spectra of individual velocity components reveal radiallylocalized signatures of the large scale structures. The radial shapes of thespectral proper orthogonal decomposition modes corresponding to the signatures,confirm the presence of high speed streaks in the outer edge of the jet at lowStrouhal number, $St \rightarrow 0$. The vortex rings and streamwise vorticesare found to occur in the shear layer at $St \approx 0.49$, where they convecttogether as a system and feed the streaks. The role of vortex rings in theexistence of streaks is then studied by strengthening the rings throughaxisymmetric excitation. The streaks are observed to persist, retaining theirshapes and show only slight changes in their energies.

Interplay of vortex rings and streaks in the near field of turbulent jets