Experiments with Unsteady, Free Surface, Three-Dimensional Vortices in a Thermally Stable, Stratified Fluid

Abstract

The unsteady characteristics of a vortex pair formed behind a delta wing airfoil at a negative angle of attack have been studied experimentally in a large towing tank with a stable density stratification. Measurements of the vortex pair's upward migration and visualizations of the vortex circulation were made using the hydrogen bubble technique with a laser sheet illumination in the transverse plane. Axial visualizations of the vortex migration and axial velocities at the vortex core were made using the hydrogen bubble technique with a diffuse light source. The effects of the rising vortices and their circulation on the free surface temperature field was recorded using an imaging infrared radiometer mounted over the free surface. (JHD)

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Document Details

Document Type
Technical Report
Publication Date
May 14, 1990
Accession Number
ADA222088

Entities

People

  • A. W. Troesch
  • M. B. Stewart
  • S. B. Cohen

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Cameras
  • Deep Water
  • Fluid Dynamics
  • Fluid Flow
  • Hydrodynamics
  • Image Processing
  • Images
  • Measurement
  • Military Research
  • Physics Laboratories
  • Stratified Fluids
  • Surface Temperature
  • Temperature Gradients
  • Three Dimensional
  • Turbulence
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerodynamics/Aeronautics.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.

Technology Areas

  • Directed Energy