HYDROFOIL FLUTTER PHENOMENON AND AIRFOIL FLUTTER THEORY. VOLUME 3. SWEEP AND TAPER

Abstract

Measured decay rates and flutter speeds for a two degree-of-freedom hydrofoil model with sweep or taper do not agree with the decay rates and flutter speeds predicted by two-dimensional strip theory, whereas the measured and predicted frequencies are in agreement. Calculations based on the two-dimensional strip theory show that increasing sweep angle or decreasing taper yields higher flutter speeds as well as higher values of the critical density ratio. It is shown that flutter-speed predictions based on quasi-steady representations of the unsteady hydrodynamic forces are not valid.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1965
Accession Number
AD0626475

Entities

People

  • Charles J. Henry
  • M. R. Ali

Organizations

  • Stevens Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Airfoils
  • Boundaries
  • Center Of Gravity
  • Classification
  • Computational Science
  • Dynamic Response
  • Equations
  • Equations Of Motion
  • Fluid Dynamics
  • Lifting Surfaces
  • Planform
  • Resonant Frequency
  • Translations
  • Two Dimensional
  • Two Dimensional Flow
  • United States Government

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Dynamics.