METHODS OF ANALYSIS OF MICROWAVE SCATTERING FROM WAKES OF HYPERVELOCITY PROJECTILES

Abstract

INTERPRETATION OF BALLISTIC RANGE EXPERIMENTAL RESULTS IS OUTLINED FOR TESTS CONDUCTED WITH 20MM BLUNT POLYETHYLENE PROJECTILES. A detailed theoretical treatment of forward-scattered microwave signals from a dilute plasma column is given. Estimates of ionized wake diameters are made from schlieren photographs of the flow field and are related to back-scattered microwave signals. Returns from perfect scattering rods are compared to returns from an ionized wake in the overdense case. Decay rate changes are noted on microwave returns from an ionized wake and may indicate the transition from laminar to turbulent flow. An indication of roughness and separation of scattering centers is shown.

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Document Details

Document Type
Technical Report
Publication Date
Feb 12, 1962
Accession Number
AD0273817

Entities

People

  • B. H. Siperly
  • W. R. Bradford

Organizations

  • General Dynamics

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Amplitude
  • Attenuation
  • Charge Density
  • Coefficients
  • Electric Fields
  • Electron Density
  • Electrons
  • Flow Fields
  • Frequency
  • Geometry
  • Inequalities
  • Microwave Frequency
  • Plane Waves
  • Projectiles
  • Radiation
  • Reflection
  • Waves

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Mechanics and Fluid Dynamics.
  • Radar Systems Engineering.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers
  • Hypersonics - Hypersonic Flight
  • Hypersonics - Hypersonic Flow