Theoretical and Experimental Investigation of the Effect of Tunnel Walls on the Forces on an Oscillating Airfoil in Two-Dimensional Subsonic Compressible Flow

Abstract

This paper presents a theoretical and experimental investigation of the effect of wind-tunnel walls on the air forces on an oscillating wing in two-dimensional subsonic compressible flow. A method of solving an integral equation which relates the downwash on a wing to the unknown loading is given, and some comparisons are made between the theoretical results and the experimental results. A resonance condition, which was predicted by theory in a previous report (NACA Rep. 1150), is shown experimentally to exist. In addition, application of the analysis is made to a number of examples in order to illustrate the influence of walls due to variations in frequency of oscillation, Mach number, and ratio of tunnel height to wing semichord.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1955
Accession Number
ADA377350

Entities

People

  • A. G. Rainey
  • Donald S. Woolston
  • Harry L. Runyan

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Compressible Flow
  • Differential Equations
  • Equations
  • Flow
  • Fluid Dynamics
  • Free Stream
  • Frequency
  • Gages
  • Integral Equations
  • Kernel Functions
  • Mach Number
  • Measurement
  • Partial Differential Equations
  • Resonant Frequency
  • Reynolds Number
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Structural Dynamics.