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Extinguishment of Cup-Burner Flames in Low Gravity

Published

Author(s)

F Takahashi, Gregory T. Linteris, V Katta

Abstract

The effects of oxidizer stream velocity and oxygen concentration, as well as gravity and pressure, on the extinguishment limits of laminar co-flow diffusion flames of methane, formed in a cup-burner apparatus, have been studied experimentally and computationally. A first attempt was made to measure the cup-burner minimum extinguishing concentration (MEC) of CO2 in microgravity ( g) aboard the NASA Reduced Gravity Aircraft (KC-135). Numerical simulations with detailed chemistry and radiative heat-loss models were performed to reveal the flame structure during the unsteady blowoff-type extinguishing processes and to predict the extinguishment limits. The MEC values determined for various oxidizing environments were:Experiment Computation Air/1g/1 atm (15.7 0.6) % 14.5 % (16.1 %) Air/1g/0.7 atm (15.4 0.5) % 13.5 % 30 % O2/1g/1 atm (34.0 1.2) % 31.0 % 30 % O2/1g/0.7 atm (32.4 1.1) % 29.9 % 21 % O2/ g/1 atm (21.4 0.7) % 19.1 % Considering the complex chemistry and flow-field interactions in the blowoff extinguishment processes, the predicted MEC values were consistently in good agreements (8 % less on average) with the measurements. The relatively high MECs of CO2 in oxygen-enriched environments point to a need for further trade-off studies of fire-extinguishing agents suitable for spacecraft and surface habitats in space exploration.
Proceedings Title
43rd
Conference Dates
January 10-13, 2005
Conference Location
Undefined
Conference Title
AIAA Aerospace Science Meeting and Exhibit

Keywords

cup burner, fire suppression, flame extinction, flame extinguishment, halon replacements, microgravity combustion

Citation

Takahashi, F. , Linteris, G. and Katta, V. (2005), Extinguishment of Cup-Burner Flames in Low Gravity, 43rd, Undefined, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=861350 (Accessed June 14, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created December 31, 2004, Updated October 12, 2021