Aerodynamic Control of Coupled Body-Wake Flow Instabilities on a Free-Moving Platform
Abstract
This ARO research program focused on modification of the coupled instability mechanisms between the flow over a moving axisymmetric bluff body and its near wake by using controlled flow perturbations on the moving flow boundary. This approach enabled prescribed modification of the time-dependent aerodynamic loads on the moving body, and, consequently active control of its motion and stability. Manipulation of the coupling between the flow over the body and the evolution and stability of the near-wake and consequently of the global aerodynamic loads was realized using fluidic actuation at the flow boundary in two limits namely, rigid motion in which the actuation-induced changes do not affect the motion of the platform, and free flight which enables feedback between the induced changes and the motion of the platform. The wind tunnel investigations utilized a moving axisymmetric wire-mounted axisymmetric bluff body integrated with individually-addressable synthetic jet actuators. The model was driven in prescribed canonical time-dependent motion using a programmable 6-DOF (x/y/z-translation and pitch/yaw/roll) 8-wire traverse developed under an ARO DURIP Program. The interactions between the actuation and the cross flow and their coupling to the stability of the near wake was investigated using particle image velocimetry (PIV), a motion analysis system, and time-resolved aerodynamic forces and moments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 06, 2020
- Accession Number
- AD1110832
Entities
People
- Ari Glezer
Organizations
- Georgia Tech Research Corporation