(a) PPS 12/2 turbulence grid
(b) PPS 14/4 turbulence grid
Figure 7: Results of preliminary CTA measurements to determine the possible influence of the presence of the airfoil on the flow parameters directly upstream of the leading edge, nominal flow speed  m/s, airfoil leading edge at  m (distance between turbulence grid and leading edge 0.1 m). Note that the dynamic range of the figures is small, 1.5 m/s and 15 m/s, respectively.