Abstract
Abstract The effects of mean flow three-dimensionality on the turbulent structure of the boundary layer on a swept wing are investigated experimentally. The configuration of the test model used to simulate the infinite swept wing condition is similar to that used by Van den Berg, B., Elsenaar, A., Lindhout, J.P.F., Wesseling, P., 1975. Measurements in an incompressible three-dimensional turbulent boundary layer, under infinite swept-wing conditions, and comparison with theory. J. Fluid Mech. 70 (1), 127–148. Mean flow measurements show that the location of the maximum cross-flow velocity is within the log-law region for the streamwise velocity profiles. In the near-wall region, the streamwise turbulence intensity, u 2 /U τ , decreases with increasing three-dimensionality. A four quadrant analysis is applied to the fluctuating velocity components in the local mean flow and wall-normal directions. At downstream stations, the contributions to the turbulent shear stress from quadrant 4 (sweeps) are predominant in the region near the wall. It is thus revealed that strong ejections are suppressed by the effects of increased three-dimensionality.
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