Supersonic indicial lift functions from transform methods


Journal Article

An alternative method to evaluate the classical linear indicial lift of airfoil downwash distribution in supersonic flow, derive the indical lift functions, and reduce the transient lift to quadrature, is discussed. The transient at short times to steady-state solutions is carried out for zeroth-to-cubic-order polynomial functions and the aerodynamic loads of simply supported panel-flutter are presented and compared with analytic polynomial approximations. The results show that the airfoil downwash is impulsively changed at t=0 and remains time-invariant for t≮0. The panel-flutter mode is approximated as a quadratic downwash description by matching the steady-state lift values and having simple analytic expressions for polynomial approximation and the exact panel-mode shape.

Full Text

Duke Authors

Cited Authors

  • Jaworski, JW; Dowell, EH

Published Date

  • August 1, 2007

Published In

Volume / Issue

  • 45 / 8

Start / End Page

  • 2106 - 2111

International Standard Serial Number (ISSN)

  • 0001-1452

Digital Object Identifier (DOI)

  • 10.2514/1.28144

Citation Source

  • Scopus