The asymmetric vortex regime of a von Kármán ogive with fineness ratio of 3.5 is experimentally studied at a Reynolds number of 156,000. Both port and starboard plasma actuators are used to introduce fluidic disturbances at the tip of the ogive which are amplified through the flow's convective instability and produce a deterministic port or starboard asymmetric vortex state (i.e. side force). Accurate control or manipulation of this asymmetric vortex state holds the potential for increased maneuverability and stability characteristics of slender flight vehicles at high angle of attack. Open-loop experimental tests are used to understand and quantify the vortex dynamics due to actuation inputs. Linear time invariant models provide a suitable model structure to replicate the vortex dynamics and allow for simulation and closed-loop control design. Standard PID control is designed and implemented. A closed-loop simulation shows arbitrary side force tracking with adequate disturbance rejection.
Open-Loop Dynamics of the Asymmetric Vortex Wake behind a von Kármán Ogive at High Incidence
Casey FagleyRelated information
1 Department of Aeronautics, U. S. Air Force Academy, Colorado Springs, CO 80840, USA
, John FarnsworthRelated information1 Department of Aeronautics, U. S. Air Force Academy, Colorado Springs, CO 80840, USA
, Chris PorterRelated information1 Department of Aeronautics, U. S. Air Force Academy, Colorado Springs, CO 80840, USA
, Jürgen SeidelRelated information1 Department of Aeronautics, U. S. Air Force Academy, Colorado Springs, CO 80840, USA
, Thomas McLaughlinRelated information1 Department of Aeronautics, U. S. Air Force Academy, Colorado Springs, CO 80840, USA
, Jinik LeeRelated information2 Agency for Defense Development, Daejeon, Republic of Korea
, Eunseok LeeRelated information2 Agency for Defense Development, Daejeon, Republic of Korea
Published Online: May 14, 2013
Abstract