Separated shear layer oscillations in open cavities can
induce drag, noise and vibration. This issue has many
aerospace applications such as Landing gears and control
surfaces [1]. Recently, phase-cancellation [1] and offinstability
frequency excitation [2] & [3] approaches have
been incorporated in different open-loop and feedback control
systems. Despite the high control performance of these
systems, further enhancement is still possible.
In this study, steady jets, as shown in fig. 1, are forced
through 2mm, two-dimensional slots at the leading and trailing
edges of the cavity. In order to study the performance of this
novel approach, different cases will be examined, including:
jet combination (blowing from cavity leading edge, suction
from cavity leading edge and blowing-suction), jet angle
(parallel or deflected jet) and jet-to-free stream velocity
factor /.
