Downward Flame Spread Rate Over PMMA Rods Under External Radiant Heating

Maria Thomsen, Luca Carmignani, Andy Rodriguez, Charles Scudiere, Christina Liveretou, Carlos Fernandez-Pello, Michael Gollner, Sandra Olson, Paul Ferkul

Research output: Contribution to journalArticlepeer-review

Abstract

There are multiple situations in which fires may occur at environmental conditions that are different than standard atmospheric conditions. Changes in ambient pressure, oxygen concentration, flow velocity, the presence of an external heat source or gravity may change the flammability and fire dynamics of materials. The objective of this work is to study the effect of external radiant heating on downward flame spread over cylindrical samples of polymethyl methacrylate (PMMA). In this work, experiments under normal gravity and atmospheric ambient conditions are conducted using a variable heat flux with peak values up to 13.2 kW/m2. A forced flow of air with a mass-mean velocity of 10 cm/s is used during the experiments. Flame spread rates were measured from video processing of the experiments at different conditions. Results show that the flame spread rate measured depends strongly on the amount of radiant heating provided. An analysis is presented to correlate the flame spread rate with the energy applied to the surface of the sample and the surface temperature. The results provide a baseline for comparison with future microgravity experiments to be performed by NASA as part of the SoFIE/MIST project aboard the International Space Station. It is expected that the results will provide insight for what is to be expected in different conditions relevant for fire safety in future space facilities.

Original languageEnglish
Pages (from-to)2229-2250
Number of pages22
JournalFire Technology
Volume58
Issue number4
DOIs
StatePublished - Jul 2022
Externally publishedYes

Keywords

  • Flame spread
  • PMMA rod
  • Radiant heating
  • SoFIE
  • Solid burning

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