Accession Number : AD0765908

Title :   A Linearized Potential Flow Theory for Airfoils with Spoilers,

Corporate Author : BRITISH COLUMBIA UNIV VANCOUVER DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Brown,G. P. ; Parkinson,G. V.

Report Date : 14 AUG 1972

Pagination or Media Count : 26

Abstract : Linearized two-dimensional potential flow theory is applied to an airfoil with an upper surface spoiler. The spoiler wake is modelled as a cavity of empirically given constant pressure, and a sequence of conformal transformations maps the linearized physical plane, with a slit on the real axis representing the airfoil plus cavity, onto the upper half of the plane exterior to the unit circle. Solutions are found for both the steady-state lift and the transient lift after spoiler actuation for airfoils of arbitrary camber, thickness and incidence, with and without a simple flap, and with spoilers of arbitrary position, height and angle. The empirical cavity pressure is arbitrary for the steady-state solution, but is assumed to have the free-stream value for the transient solutions. Comparisons are made with the results of wind-tunnel experiments, and, for the steady-state solutions, with predictions of an earlier theory. (Modified author abstract)

Descriptors :   (*AIRFOILS, AERODYNAMIC CHARACTERISTICS), TWO DIMENSIONAL FLOW, LIFT, MATHEMATICAL ANALYSIS

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE