Line-of-Sight Variations of Temperature and Species in Solid Propellant Flames

Carl F. Mallery, Stefan T. Thynell

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The purpose of this work is to deduce line-of-sight variations of temperature and species concentrations in high-pressure, solid-propellant flames by using spectral transmittances acquired by Fourier transform infrared spectrometry. To deduce these variations, an inverse technique was developed. For its validation, temperature and mole-fraction profiles within nitramine-composite propellant flames at low pressures were compared with similar measurements made by using fine-wire thermocouples and a microprobe mass spectrometer. Subsequently, it was applied to spectral transmittance data acquired for a high-pressure, self-sustained solid-propellant flame. Several conclusions were made. First, at about 3-4 mm above the surface, one must account for line-of-sight variations. Second, the deduced centerline temperatures were within 50 K of those measured using fine-wire thermocouples. Finally, the deduced centerline concentrations of CO and NO established a dark-zone behavior, which is expected of nitramine-composite propellant flames. However, to deduce the line-of-sight variation of other infrared-active species, further improvements in the database of the spectral absorption coefficients must be made.

Original languageEnglish (US)
Pages (from-to)505-512
Number of pages8
JournalJournal of Propulsion and Power
Volume16
Issue number3
DOIs
StatePublished - Jan 1 2000

Fingerprint

solid propellants
Solid propellants
Composite propellants
line of sight
nitramine propellants
flames
composite propellants
Thermocouples
transmittance
thermocouples
Wire
Infrared radiation
temperature
wire
Mass spectrometers
Temperature
Spectrometry
Fourier transforms
absorption coefficient
mass spectrometers

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Fuel Technology
  • Mechanical Engineering
  • Space and Planetary Science

Cite this

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abstract = "The purpose of this work is to deduce line-of-sight variations of temperature and species concentrations in high-pressure, solid-propellant flames by using spectral transmittances acquired by Fourier transform infrared spectrometry. To deduce these variations, an inverse technique was developed. For its validation, temperature and mole-fraction profiles within nitramine-composite propellant flames at low pressures were compared with similar measurements made by using fine-wire thermocouples and a microprobe mass spectrometer. Subsequently, it was applied to spectral transmittance data acquired for a high-pressure, self-sustained solid-propellant flame. Several conclusions were made. First, at about 3-4 mm above the surface, one must account for line-of-sight variations. Second, the deduced centerline temperatures were within 50 K of those measured using fine-wire thermocouples. Finally, the deduced centerline concentrations of CO and NO established a dark-zone behavior, which is expected of nitramine-composite propellant flames. However, to deduce the line-of-sight variation of other infrared-active species, further improvements in the database of the spectral absorption coefficients must be made.",
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Line-of-Sight Variations of Temperature and Species in Solid Propellant Flames. / Mallery, Carl F.; Thynell, Stefan T.

In: Journal of Propulsion and Power, Vol. 16, No. 3, 01.01.2000, p. 505-512.

Research output: Contribution to journalArticle

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