AERODYNAMICALLY-ADAPTIVE AERO-STRUCTURES USING FLOW-INTERACTIVE CONTROL BY DISTRIBUTED BLEED ACTUATION
Abstract
The proposed experimental/theoretical research program will investigate the fundamentalmechanisms of controlled flow-structure interactions on flexible wings to effect desired, adaptiveaeroelastic characteristics. These flow-structure interactions are interactively adjusted by theaerodynamic load distributions present in flight using active flow control (AFC). A key element ofthe proposed program is that the reciprocal interactions between the wing and the embedding flow,and therefore the aerodynamic loads, are regulated by distributed active air bleed driven through theaerodynamic surfaces by inherent pressure differences in flight. Detailed wind tunnel investigationsusing modular 3-D half-span flexible wing models will explore and elucidate the coupling betweenbleed-induced aerodynamic loads and aeroelastic properties and will be supported by theoretical andnumerical aerodynamic/structural analyses. Fundamental mechanisms of the flow-structureinteractions will be captured by structural reduced order models (ROMs) that will incorporate theeffects of distributed bleed actuation to alter the apparent structural properties of the wing (e.g., itsstiffness and damping) and that will predict deflections in bending and twist. These ROMs will beformulated using modified aerodynamic analyses based on experimentally-identified aerodynamicload distributions without the need for extensive computations. The proposed investigations willelucidate the response to these flow-structure interactions to quasi-static and time-dependent,transitory bleed actuation when the wing is either statically flow-stiffened or dynamically-excited byflow-controlled unsteady aerodynamic loads using transitory bleed actuation. Equivalent dampingeffects, relative time scales of actuation and wing dynamic response, along with the presence ofinstabilities will be evaluated for wing deflections in bending and twist.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 11, 2018
- Source ID
- FA95501810225
Entities
People
- Ari Glezer
Organizations
- Air Force Office of Scientific Research
- Georgia Tech Research Corporation
- United States Air Force