The Bubble Concept of Axisymmetric Vortex Breakdown with and without Obstacles in the Vortex Core

Abstract

There is now sufficient evidence that axisymmetric recirculation zones in the form of 'bubbles' on the axis of rotation of a vortex can be steady-state and stable. It appears also that the majority of researchers accept these bubbles as a form or a part of vortex breakdown. However, a gray area with regard to the definition of vortex breakdown exists when no stagnation point at the axis of rotation occurs. To use the appearance of such a stagnation point as a criterion for vortex breakdown might be too restrictive. The situation becomes even more aggravated when an obstacle is placed on the axis of rotation. Are recirculation (or separation) regions in the front and rear of the obstacle indications of vortex breakdown or of Taylor-Proudman columns? This report addresses some of the problems in context with vortex control.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1988
Accession Number
ADA204235

Entities

People

  • Hans J. Lugt
  • Joseph J. Gorski

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Algorithms
  • Axial Flow
  • Axisymmetric Flow
  • Classification
  • Computational Fluid Dynamics
  • Equations
  • Flow
  • Flow Fields
  • Fluid Dynamics
  • Fluid Flow
  • Mathematics
  • Navier Stokes Equations
  • Reynolds Number
  • Security
  • Stagnation Point
  • Steady State
  • Wing Tips

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Systems Analysis and Design