HOW TO ANALYZE 2-D SCHLIEREN PHOTOGRAPHS TO OBTAIN THE DENSITY GRADIENT STRUCTURE OF 3-D FLOW FIELDS

Abstract

A technique is outlined by which density gradients visible in two- dimensional schlieren photographs can be analyzed to obtain the density gradient structure (i.e., the shape and location of density gradients such as shock waves and vortices) of three-dimensional flow fields. Practical application of the technique relies on obtaining a series of schlieren photographs of the flow field from different viewing orientations. The analysis is specialized to the case of a right-circular cone at angle of attack. Results are presented which show the shape and location of the bow shock of a 5 deg half-angle right- circular cone at a nominal Mach number of 5.0, a nominal free-stream Reynolds number per foot of 4,800,000 and angles of attack equal to 15 and 40 deg.

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Document Details

Document Type
Technical Report
Publication Date
Apr 15, 1969
Accession Number
AD0694469

Entities

People

  • Allen E. Winkelmann
  • Robert H. Feldhuhn

Organizations

  • Naval Ordnance Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Bow Shock
  • Coordinate Systems
  • Flow
  • Flow Fields
  • Free Stream
  • Geometry
  • Line Of Sight
  • Munitions
  • Ordnance Laboratories
  • Photographs
  • Reynolds Number
  • Shape
  • Shock
  • Shock Waves
  • Three Dimensional
  • Three Dimensional Flow
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computer Vision.
  • Fluid Dynamics.