Study of Vortex Arrays Induced Artificially and from Centrifugal Instabilities

Abstract

Experimental results are presented which describe the development and structure of: (1) vortex pairs and vortex arrays which are embedded in turbulent boundary layers, and (3) vortex arrays developing as a result of centrifugal instabilities in a curved channel. Streamwise vortex pairs embedded in a turbulent boundary layer on a flat plate are induced artificially using vortex generators. Mean velocity surveys, total pressure surveys, and wall heat transfer distributions show that Stanton numbers are augmented when vortex pairs have a common downwash. With common upwash, the Stanton number perturbation from vortex pairs is much less. Vortex arrays induced from centrifugal instabilities were studied in a 40:1 aspect ratio channel with mild curvature. Mean velocity and total pressure surveys for Dean numbers from 50 to 150 illustrate some structural characteristics of vortex pairs. Keywords: Theses; Embedded vortices; Vortex pairs; Vortex arrays; Turbulent boundary layers; Dean vortices; Centrifugal instabilities; Laminar flow.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1989
Accession Number
ADA216499

Entities

People

  • Michael F. Tuzzolo

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Aspect Ratio
  • Boundary Layer
  • Computational Fluid Dynamics
  • Coordinate Systems
  • Engineering
  • Flow
  • Fluid Dynamics
  • Fluid Mechanics
  • Generators
  • Heat Transfer
  • Layers
  • Measurement
  • Mechanical Engineering
  • Pressure Distribution
  • Turbulent Boundary Layer
  • Vortex Generators
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.