Large field of view multi-resolution experimental measurement of the spatial structure of a high Reynolds number turbulent boundary layer

A multiple camera, multiple resolution PIV system consisting of nine highe resolution cameras and two dual cavity lasers is used to instantaneously measure a large streamwise, wall-normal field of view (2$\delta \times 1.5\delta$), while simultaneously resolving the near-wall flow down to a height of y $+ \approx$ 3 at Reynolds numbers of Re$\tau \approx $ 8, 000 to 30, 000. The high spatial resolution in the near-wall vicinity enables direct estimation of the wall shear stress and allows for subsequent and conditional analysis of both the near-wall and larger outer flow structures and fluctuations. The quality of this measurement is assessed via statistical comparison with previous measurements made using hot-wire anemometry and compared with the highest available Reynolds number DNS. Conditional two-point correlations, and conditional mean structures will be presented.