Arc-Tunnel Stagnation Enthalpy Measurements Utilizing the Copper-Line-Ratio Method Corrected for Self-Absorption Effects.

Abstract

Detailed measurements of the copper emission spectrum at 5106 A and 5153 A were obtained while observing radiation from the free-stream and model nosecap regions of an arc-heated wind tunnel flow. The ratio of peak line intensities and the absolute width of the 5106 A line were used to infer gas temperature (i.e., enthalpy) and copper density corrected for self-absorption effects. Line shift measurements were also obtained in order to corroborate the use of Lindholm's collision broadening theory in the self-absorption analysis. Final enthalpy results for the peaked profile mode of operation indicated that a significant correction to measured enthalpy resulted when self-absorption was taken into account. The resulting average stagnation enthalpy value of 5250 Btu/lbm was in good agreement with previously obtained results utilizing a combined heat flux and ptiot probe technique. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1979
Accession Number
ADA074635

Entities

People

  • Anthony A. Boiarski

Organizations

  • Battelle Memorial Institute

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies
  • Human Systems
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Acquisition
  • Air Force
  • Bow Shock
  • Collision Broadening
  • Computer Programs
  • Computers
  • Data Acquisition
  • Data Analysis
  • Detectors
  • Free Stream
  • Line Spectra
  • Materials
  • Measurement
  • Measuring Instruments
  • Spectral Lines
  • Stagnation Temperature

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Spectroscopy.

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference