TY - JOUR
T1 - Active control of self-induced roll oscillations of a wing using synthetic jet
AU - Hu, Tianxiang
AU - Wang, Zhijin
AU - Gursul, Ismet
AU - Bowen, Chris
PY - 2013/9
Y1 - 2013/9
N2 - Active control of self-excited roll oscillations of a rectangular flat plate wing with an aspect ratio of two was studied experimentally in a wind tunnel, using synthetic jet excitation near the leading edge. It was found that, by activating the synthetic jet excitation at an optimum frequency of St = 1, large amplitude roll oscillations could be attenuated and the onset of the oscillation can be delayed by up to Δαmax = 3.5° for extremely small values of momentum coefficient. High frame-rate Particle Image Velocimetry (PIV) measurements revealed a strong resonance between the synthetic jet excitation and shear layer instabilities. The resonance energizes the shear layer separated from the leading edge and results in a local flow field that is more typical of lower wing incidence, thus effectively suppressing roll oscillations.
AB - Active control of self-excited roll oscillations of a rectangular flat plate wing with an aspect ratio of two was studied experimentally in a wind tunnel, using synthetic jet excitation near the leading edge. It was found that, by activating the synthetic jet excitation at an optimum frequency of St = 1, large amplitude roll oscillations could be attenuated and the onset of the oscillation can be delayed by up to Δαmax = 3.5° for extremely small values of momentum coefficient. High frame-rate Particle Image Velocimetry (PIV) measurements revealed a strong resonance between the synthetic jet excitation and shear layer instabilities. The resonance energizes the shear layer separated from the leading edge and results in a local flow field that is more typical of lower wing incidence, thus effectively suppressing roll oscillations.
UR - http://dx.doi.org/10.1260/1756-8250.5.3-4.201
U2 - 10.1260/1756-8250.5.3-4.201
DO - 10.1260/1756-8250.5.3-4.201
M3 - Article
VL - 5
SP - 201
EP - 214
JO - International Journal of Flow Control
JF - International Journal of Flow Control
IS - 3-4
ER -