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Figure 12


Fig. 12. Global sectional flow structure. (A) DPIV result at 0.29r at mid-downstroke (AR=5.8, {alpha}m=60°, {Phi}=60°, Re=1624). Plot representation as in Fig. 7A; velocity vectors are shown. The in- and outboard blue vorticity concentrations correspond to the primary and minor vortices, respectively. The yellow and pink vorticity region behind the trailing edge is the shed trailing-edge vortex. Scale bar, 200 mm s-1. (B) Conjectured topological structure of the sectional flow field. F, focus; S, saddle; S', semi-saddle.





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