Flutter Analysis of Two-Dimensional and Two-Degree-of-Freedom Airfoils in Small-Disturbance, Unsteady Transonic Flow.

Abstract

Flutter analyses are performed for an NACA 64A006 and an NACA 64A010 airfoil by simultaneously using two transonic aerodynamic computational codes: (1) STRANS2 and UTRANS2 based on the relaxation method and (2) LTRAN2 based on the indicial and time-integration methods. Flutter results are obtained as plots of flutter speeds and the corresponding reduced frequencies versus one of the four parameters; airfoil-air mass ratio; position of the mass center; position of the elastic axis; and free stream Mach number. On each figure, several sets of curves for different values of plunge-to-pitch frequency ratios are shown simultaneously. The flutter results obtained by using relaxation and the indicial methods are, in general, in good agreement. The present flutter results for a special case of a thin parabolic airfoil at a low transonic Mach number of 0.7 compare favorably with that obtained by using linear flat plate theory. The trend of each flutter curve and the effect of each parameter are discussed in detail.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1978
Accession Number
ADA069223

Entities

People

  • Alfred G. Striz
  • P. Guruswamy
  • T. Y. Yang

Organizations

  • Purdue University

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Computer Programs
  • Computer Simulations
  • Equations Of Motion
  • Finite Element Analysis
  • Flow Fields
  • Fluid Dynamics
  • Mach Number
  • Mechanics
  • Moment Of Inertia
  • Pressure Distribution
  • Steady Flow
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Dynamics.