The Development and Structural Characteristics of Dean Vortices in a Curved Rectangular Channel

Abstract

The development and structure of Dean vortices in a curved channel were measured and studied. A 40:1 aspect ratio channel with mild curvature was employed. Circulation of mean streamwise vorticity, and maxima of streamwise, spanwise and radial components of vorticity increase as the Dean number increases from 40 to 140. Mean vorticity components were determined from measurements of the three components of mean velocity using a miniature five hole pressure probe. Spectra obtained from a subminiature crossed wire probe show principal and harmonic frequencies for Dean numbers greater than 165, when vortices are twisting. Spectral peaks at other Dean numbers provide evidence of oscillations also observed during flow visualization.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1988
Accession Number
ADA201249

Entities

People

  • Lawrence R. Baun

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Aspect Ratio
  • Boundary Layer
  • Computational Fluid Dynamics
  • Engineering
  • Flow Visualization
  • Fluid Dynamics
  • Frequency
  • Geometry
  • Measurement
  • Mechanical Engineering
  • Pressure Distribution
  • Pressure Measurement
  • Processing Equipment
  • Reynolds Number
  • Signal Processing
  • Test Facilities
  • Turbulent Mixing

Readers

  • Fluid Mechanics and Fluid Dynamics.