The Fluid Mechanics of Vortex Cutting By a Blade.

Abstract

A study of the fluid dynamics associated with impact of a vortex on a body (such as a blade) moving normal to the vortex axis was performed. The physical features of the flow evolution were categorized in terms of two dimensionless parameters, which represent a ratio of length scales and a ratio of velocity scales associated with the vortex core and with the body. Models of various features of the flow evolution are constructed and compared against experimental and detailed computational data. Primary features of interest in the study include vortex deflection and axial flow in the vortex core resulting from stretching by the blade, intense vorticity deformation resulting from penetration of the body into the vortex core (and resulting force on the body), traveling vortex breakdown formed immediately following vortex cutting by the body, and interaction of shed vorticity from the body with the primary vortex.

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Document Details

Document Type
Technical Report
Publication Date
Sep 24, 1995
Accession Number
ADA300023

Entities

People

  • Jeffrey S Marshall

Organizations

  • Iowa State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Axial Flow
  • Boundary Layer
  • Computational Fluid Dynamics
  • Equations
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • High Resolution
  • Inviscid Flow
  • Layers
  • Leading Edges
  • Mechanics
  • Potential Flow
  • Pressure Signatures
  • Stratified Fluids
  • Viscous Flow

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.