The influence of radiative heat feedback on burning rate in aluminized propellants
- Mechanical and Industrial Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL (US)
Metalized solid propellants have higher final flame temperatures and higher flame radiant intensities than nonmetalized propellants. However, the importance of radiative heat feedback in metalized propellant combustion is still unknown. In this study, radiative effects in aluminized propellants were examined by embedding optical fibers and microthermocouples in propellants to measure radiative and conductive feedback. Extinguishment by rapid depressurization was used to determine the condition and location of the thermocouple and optical fiber at the burning surface. Hemispherical reflectivity measurements were also made to determine propellant absorptivity. The reflectivity measurements showed that even a small amount of aluminum powder in a propellant increases the absorptivity significantly through multiple scattering in spite of the intrinsically high-bulk reflectivity of aluminum. The results of this study confirm previous findings that the effect of radiation on burning rate in nonmetalized propellants is negligible because of low incident flux from the flame and low absorptivity of the propellant.
- OSTI ID:
- 5641700
- Journal Information:
- Combustion and Flame; (USA), Vol. 84:1 and 2; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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