Unsteady aerodynamic models for agile flight at low reynolds numbers

Steven L. Brunton, Clarence W. Rowley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

The goal of this work is to develop low-order models for the unsteady aerodynamic forces on a small wing in response to agile maneuvers and gusts. In a previous study, it was shown that Theodorsen's and Wagner's unsteady aerodynamic models agree with force data from DNS for pitching and plunging maneuvers of a 2D flat plate at Reynolds numbers between 100 and 300 as long as the reduced frequency k is not too large, k < 2, and the effective angle-of-attack is below the critical angle. In this study reduced order models are obtained using an improved method, the eigensystem realization algorithm (ERA), which is more efficient to compute and fits within a standard control design framework. For test cases involving pitching and plunging motions, it is shown that Wagner's indicial response is closely approximated by ERA models of orders 4 and 6, respectively. All models are tested in a framework that decouples the longitudinal flight dynamic and aerodynamic models, so that the aerodynamics are viewed as an input-output system between wing kinematics and the forces generated. Lagrangian coherent structures are used to visualize the unsteady separated flow.

Original languageEnglish (US)
Title of host publication48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
StatePublished - 2010
Event48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Orlando, FL, United States
Duration: Jan 4 2010Jan 7 2010

Publication series

Name48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

Other

Other48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
CountryUnited States
CityOrlando, FL
Period1/4/101/7/10

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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    Brunton, S. L., & Rowley, C. W. (2010). Unsteady aerodynamic models for agile flight at low reynolds numbers. In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition [2010-0552] (48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition).