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Aluminum flame temperature measurements in solid propellant combustion.

Christian G Parigger1, Alexander C Woods, David M Surmick

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Summary

Researchers measured aluminized propellant temperatures using AlO emission and thermal spectra. Temperatures were higher in the upper plume (around 2980 K) than the lower plume (around 2450 K).

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Area of Science:

  • Combustion science
  • Spectroscopy
  • Materials science

Background:

  • Aluminized propellants are crucial in various applications.
  • Accurate temperature measurements in propellant plumes are essential for performance analysis.
  • Previous methods often lack detailed spatial temperature resolution.

Purpose of the Study:

  • To determine the temperature profile of an aluminized propellant plume.
  • To investigate the influence of height and plume depth on temperature.
  • To analyze particle size effects on temperature measurements.

Main Methods:

  • Utilizing diatomic aluminum oxide (AlO) emission spectra to infer temperature.
  • Employing thermal emission spectra analysis.
  • Investigating wavelength-dependent emissivity models to account for particle size effects.

Main Results:

  • Average temperatures of 2980 ± 80 K were measured higher in the plume (305 and 508 mm from the burning surface).
  • An average temperature of 2450 ± 100 K was inferred lower in the plume (152 mm from the burning surface).
  • Thermal emission analysis indicated higher temperatures with constant emissivity assumptions.

Conclusions:

  • Temperature varies significantly with height within the aluminized propellant plume.
  • AlO emission spectroscopy provides a viable method for plume temperature diagnostics.
  • Particle size and wavelength-dependent emissivity are critical factors in accurate thermal analysis.