Unsteady Flow Field of Large-Amplitude Pitching Airfoils

Abstract

This research program investigated the physical mechanisms involved in the onset of leading edge separation when airfoils pitch to high angles of attack. Both constant pitch rate and variable pitch rate motions were considered. The highlights of results from a combined experimental and computational effort are described in this report. The conclusions from this research indicate the need for boundary-layer resolved measurements of the flow behavior near the leading edge and the evolution of the reverse flow regions on the suction surface. Furthermore, the deliberate shaping of the pitch trajectory for the purpose of optimization of separation delay is suggested as one way to manage the flow and aerodynamic behavior of an airfoil. Dynamic Stall, Unsteady Separation

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1994
Accession Number
ADA280444

Entities

People

  • Manoochehr M. Koochesfahani

Organizations

  • Michigan State University

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • High Angles
  • Layers
  • Leading Edges
  • Measurement
  • Mechanical Phenomena
  • Pressure Distribution
  • Reynolds Number
  • Secondary Flow
  • Turbulent Mixing
  • Two Dimensional
  • Unsteady Flow

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Mechanics and Fluid Dynamics.
  • Team-Based Human-Centered Cognitive Task Decision Making and Information Performance.