Unsteady Separation Characteristics of Airfoils Operating Under Dynamic Stall Conditions,

Abstract

Unsteady viscous/inviscid interaction phenomena were investigated on airfoils operating under dynamic stall conditions. It is well known from experiments that, in the upstroke region of a sinusoidally oscillating airfoil, the flow remains attached up to incidences considerably larger than the static stall angle. Reversed flow areas develop close to the airfoil surface without boundary layer separation. These complicated flow phenomena are investigated in the present study on the basis of coupling procedures between a time-dependent inviscid panel method and 2-d unsteady boundary layer codes. Two strategies are pursued: 1. Coupling of inviscid panel method with boundary layer code-direct mode; and 2. Strong coupling of inviscid panel method with boundary layer code-inverse mode. The main features of the unsteady time-marching panel method and boundary layer codes are discussed. Emphasis is placed on the investigation of numerical stability and the phenomenon of unsteady separation.

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Document Details

Document Type
Technical Report
Publication Date
Sep 25, 1986
Accession Number
ADA183092

Entities

People

  • Lawrence W. Carr
  • Tuncer Cebeci
  • Wolfgang Geissler

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Aerodynamic Characteristics
  • Aeroelasticity
  • Boundary Layer
  • Computational Fluid Dynamics
  • Equations
  • Experimental Data
  • Fluid Flow
  • Laminar Boundary Layer
  • Layers
  • Mechanical Properties
  • Physics Laboratories
  • Stagnation Point
  • Three Dimensional
  • Trailing Edges
  • Turbulent Boundary Layer
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Mechanics and Fluid Dynamics.