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FLOW CONTROL ON A TWO-DIMENSIONAL CIRCULAR CYLINDER

Michael Amitay
Aerospace, Transportation and Advanced System Laboratory Georgia Tech Research Institute, Atlanta, GA 30332, USA

Andrew M. Honohan
School of Mechanical Engineering Georgia Institute of Technology Atlanta, GA 30332-0405, USA

Ari Glezer
George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology 771 Ferst Drive, Atlanta, Georgia 30332, USA

要約

Controlled modification of the global perfonnance of aerodynamic surfaces is achieved by fluidic manipulation of their apparent aerodynamic shape and is effected by the interactions of arrays of synthetic jet actuators with the cross flow within a finite streamwise domain that displaces the local streamlines near the surface and thereby induces an 'apparent' modification of the flow boundary and of the streamwise pressure gradient. The operating frequency of the control jets is high enough so that the actuation period is at least an order of magnitude lower than the relevant characteristic time scale of the flow. Therefore, the finite interaction domains between the control jets and the cross flow are quasi-steady and hence the induced aerodynamic forces are virtually time-invariant. Earlier work at Georgia Tech demonstrated the utility of this control approach for the suppression of flow separation at post-stall angles of attack. The present work focuses on the modification of the aerodynamic characteristics of a circular cylinder at subcritical Reynolds number where the localized displacement of the streamlines over the boundary is achieved using jet actuators and miniature [O(0.01D)] surface-mounted passive obstruction.