LIFTING-SURFACE THEORY APPLIED TO ISOLATED RING WINGS AT ANGLE OF ATTACK

Abstract

Developed in this report are expressions for the lift, pitching moment, and location of the aerodynamic center due to free-stream angle of attack for an isolated cylindrical wing based on a solution of Weissinger's general boundary condition for ring wings. From the components of ring vorticity expanded in a Birnbaum series and satisfying the velocity boundary-flow condition, and from the Kutta-Joukowski relation for the force on a vortex surface, the lift, moment, and aerodynamic center can be expressed in terms of the Birnbaum coefficients. It was found that the lift and pitching moments for cylindrical ring wings are substantially different from the results for two- dimensional flat plate (thin) airfoils. Calculations show a significant shift in the aerodynamic center upstream of the 1/4-chord point for cylindrical ring wings.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1963
Accession Number
AD0426123

Entities

People

  • Jack F. Reynolds

Organizations

  • Naval Air Weapons Station China Lake

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Electronics Laboratories
  • Engineering
  • Engineers
  • Free Stream
  • Geometry
  • Hydrodynamics
  • Marine Engineering
  • Munitions
  • Naval Architecture
  • Ordnance Laboratories
  • Physics Laboratories
  • Ring Wings
  • Three Dimensional
  • Two Dimensional
  • Underwater Ordnance
  • Weapons

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Dynamics.
  • Structural Dynamics.