The Fluid Mechanics of Vortex Cutting by a Blade

Abstract

A study of the nonlinear response of a vortex to the approach of, and cutting by, a blade traveling in the plane normal to the vortex axis has been Performed. Two different types of vortex forces on the blade are distinguished. For large values of the ratio of blade thickness TAU to vortex ambient core radius sigma sub OMICRON, the force on the blade is primarily due to decreased pressure near the blade leading edge due to bending of the vortex about the blade. For values of TAU/sigma sub OMICRIN of OMICRON(1) or less, the vortex does not bend substantially during interaction with the blade and instead the blade passes through, or 'cuts', the vortex. In this case, the force on the blade is primarily due to formation of a vortex shock which propagates on the vortex away from the blade, and the subsequent difference in vortex core radius on opposite sides of the blade due to the vortex shock. This study was conducted based on analytical, computational and experimental studies, the results of which compared well in the regimes in which each are valid.

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Document Details

Document Type
Technical Report
Publication Date
Sep 25, 1993
Accession Number
ADA270932

Entities

People

  • Jeffrey S Marshall

Organizations

  • Florida Atlantic University

Tags

Communities of Interest

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

DTIC Thesaurus Topics

  • Arm Bones
  • Axial Flow
  • Boundaries
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Differential Equations
  • Equations
  • Flow
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Mechanics
  • Geometry
  • Layers
  • Leading Edges
  • Scientists
  • Thickness

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Mechanics and Fluid Dynamics.