A scale-dependent coherence analysis of turbulent round jets including the effects of shear layer manipulation

•Two-point measurements were conducted to assess the scaling of coherent structures in turbulent jets at ReD = 10000, 20000, and 50000 and a range of axial locations.•A scale-dependent coherence analysis reveals a hierarchical structure of eddies.•While these eddy structures are not geometrically self-similar at the centreline, away from the centreline they approach self-similarity status.•A stochastic aspect ratio of 3.4 was found at ReD=10000, which increases with increasing Reynolds number up to ReD=50000. Two-point hot-wire measurements were conducted to assess the scaling of coherent structures in turbulent round jets. A scale-dependent coherence analysis was applied to datasets consisting of two-point synchronized axial velocity measurements with varying radial separations between the hot-wire positions while the reference hot-wire was fixed at the centreline and two off centreline positions in different datasets. Measurements were carried out at ReD=10000, 20000, and 50000 and a range of axial locations (3 ≤ x/D ≤ 25). The scale-dependent coherence analysis reveals a hierarchical structure of eddies over the axial range 15 ≤ x/D ≤ 25 for λx/y0.5