THE STAGNATION-POINT LANGMUIR PROBE IN A SHOCK TUBE--THEORY AND MEASUREMENTS

Abstract

A model of the ion-electron flow in the stagnation region between the detached shock and the wall of a Langmuir-type probe is proposed for ionized air in a shock tube at ion mass fractions less than 1/10,000. Based on the close agreement between numerical calculations and measurements of the probe wall ion current density, the pro posed model gives an accurate description of the ion- electron flow in the stagnation-point boundary layer when negative potentials are applied at the stagnation point of the probe. The procedure is indicated to be applicable also in the region between the detached probe shock and the edge of the boundary layer. The ion and electron densities in the boundary layer are shown to be strongly dependent on the equilibrium conditions for the high- temperature gas behind the shock. Hence, the ion and electron number densities in the undisturbed incident flow ahead of the detached shock cannot be obtained unless it is possible to calculate the changes in the number densities across the shock.

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Document Details

Document Type
Technical Report
Publication Date
Jun 28, 1963
Accession Number
AD0416346

Entities

People

  • Irvin Pollin

Organizations

  • Harry Diamond Laboratories

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aeronautical Engineering
  • Air Force
  • Boundary Layer
  • Boundary Layer Flow
  • Charged Particles
  • Computational Fluid Dynamics
  • Current Density
  • Diffusion Coefficient
  • Electron Density
  • Electrons
  • Fluid Dynamics
  • Heat Transfer
  • Measurement
  • Military Research
  • Shock Tubes
  • Test And Evaluation
  • Test Equipment

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Plasma Physics.

Technology Areas

  • Microelectronics