Computational Fluid-Body Interaction of Hinge Connected Flapping Plate in Hover

摘要

Direct Numerical Simulation (DNS) is conducted on hinged plates to model the effects of passive deflection on aerodynamic performance of a flexible wing in hover. The plate is actively controlled by prescribed motion either at the leading edge only, or on part of the body; the rest of it is subjected to passive deflection due to fluid-body interaction. The influences of stroke-to-chord ratio are studied using one-link plate. Both the averaged lift-to-drag ratio and the Root Mean Square (RMS) of lift and drag are deteriorated as the stroke amplitude gets shorter. Using a model of two-link plate, the hinge location is varied along chord to investigate the optimal aerodynamic performance obtained by passive deflection. In the range we have studied, the plate with mid-chord hinge and ±45° incidence limiter generates close lift-to-drag ratio, and smaller RMS lift and drag values, compared with its rigid counterpart.