Flow Control Over a Circular Cylinder by Surface Modification
Abstract
Controlled modification of the global performance 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. Because 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, the interaction between the control jets and the cross flow is quasi-steady and the induced aerodynamic forces are virtually time-invariant. An important aspect of the present work is the demonstration that under some conditions, the alteration of the global aerodynamic forces can also be realized by a miniature [O(0.01D)], surface-mounted passive obstruction
- Publication:
-
APS Division of Fluid Dynamics Meeting Abstracts
- Pub Date:
- November 2003
- Bibcode:
- 2003APS..DFD.DM009A