Abstract
The two-dimensional asymmetric near wake behind a GAW(2) airfoil section is studied at low speeds. Mean velocity measurements have been made in the near wake. Mean velocity profiles in the near wake are presented. Also integral parameters based on the mean velocity profiles have been presented here. In the near wake region mean velocity profiles are seen to exhibit symmetry within a distance of about 60 trailing edge momentum thicknesses downstream of the trailing edge.
Highlights
Turbulent wake region is the region of flow behind the trailing edge of a body where the upstream boundary layers merge into one single shear layer
The asymmetric wake generated in this way is more akin to a mixing layer between two different streams of different total pressures, and they show wake-like behaviour only in the region close to the trailing edge, and quickly start to show the mixing layer type of profiles
The pressure coefficient distribution indicates that the boundary layer is only under a moderate adverse streamwise pressure gradient and the flow is attached near the trailing edge
Summary
Turbulent wake region is the region of flow behind the trailing edge of a body where the upstream boundary layers merge into one single shear layer. At the edge of the trailing edge of a streamlined body, where the boundary layers transform into a wake, the skin friction suddenly drops to zero, and at the same time, the wall restriction on the normal-towall velocity component is removed In symmetric wakes, this allows mixing across the wake centreline and initiates inner near wake[1]. There is longer-range influence due to equalisation of the pressure field, when there is a pressure variation in the trailing edge region, as in the case of airfoil experiencing lift These effects appear as combined and interact with each other. Research work[10] studied extensively the three-dimensional asymmetric turbulent near wake behind a swept wing with GAW(2) airfoil cross section. Our focus was concentrated in the wake region close to the trailing edge until about 75 trailing edge momentum thicknesses distance downstream of the trailing edge
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