Nonlinear inviscid aerodynamic effects on transonic divergence, flutter, and limit-cycle oscillations

Published

Journal Article

By the use of a state-of-the-art computational fluid dynamic (CFD) method to model nonlinear steady and unsteady transonic flows in conjunction with a linear structural model, an investigation is made into how nonlinear aerodynamics can effect the divergence, flutter, and limit-cycle oscillation (LCO) characteristics of a transonic airfoil configuration. A single-degree-of-freedom (DOF) model is studied for divergence, and one- and two-DOF models are studied for flutter and LCO. A harmonic balance method in conjunction with the CFD solver is used to determine the aerodynamics for finite amplitude unsteady excitations of a prescribed frequency. A procedure for determining the LCO solution is also presented. For the configuration investigated, nonlinear aerodynamic effects are found to produce a favorable transonic divergence trend and unstable and stable LCO solutions, respectively, for the one- and two-DOF flutter models.

Full Text

Duke Authors

Cited Authors

  • Thomas, JP; Dowell, EH; Hall, KC

Published Date

  • January 1, 2002

Published In

Volume / Issue

  • 40 / 4

Start / End Page

  • 638 - 646

International Standard Serial Number (ISSN)

  • 0001-1452

Digital Object Identifier (DOI)

  • 10.2514/2.1720

Citation Source

  • Scopus