Abstract
A finite wing was pitched downward at a constant rate from a fully stalled condition to zero angle of attack. Dynamic reattachment on the downward pitching wing was characterized in detail using unsteady surface pressure measurements. Results showed that dynamic reattachment initiation and progression velocity varied in response to alterations in nondimensiona l pitch rate and span location. In addition, these alterations to reattachment initiation and progression were prominently reflected in normal force data. An empirical model for dynamically separating flowfields was successfully adapted to account for these observed trends. Comparisons between dynamically reattaching and dynamically separating flows were also informative. Characterization and comprehension of three-dimensional dynamic reattachment are crucial prerequisites for control of unsteady separated flowfields generated by rapidly maneuvering aircraft, helicopter rotor blades, and wind energy machines.
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