Effects of Active and Passive Flow Control on Dynamic-Stall Vortex Formation

摘要

A low-speed wind-tunnel investigation has been undertaken to determine the effect of synthetic jet actuation in combination with fixed vortex generators on an airfoil performing a linear ramping motion. An instrumented NACA 0015 wing was ramped from 0-27 deg at two pitch rates during which surface pressures were recorded. The pressures were integrated to yield forces and moments. The data indicate that in the absence of fluidic actuation the tested vortex generator configurations do not delay the onset of the dynamic-stall vortex, but they do augment its induced loading and delay viscous effects. In concert with the synthetic jet, the effect of the vortex generators was marginal, although a moderate dependency on vortex generator location was evident.