Reep, J;
Torero, JL;
Hadden, RM;
(2025)
Assessing the effect of oxidizer on flame geometry and effluent composition from burning solids.
Fire Safety Journal
, 152
, Article 104347. 10.1016/j.firesaf.2025.104347.
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Abstract
The combustion chemistry and geometry of a diffusion flame are dictated by the transport of a fuel and an oxidizer towards a flame sheet. To enable the independent assessment of the impact of an oxidizer on a diffusion flame, the fuel injection rate must be controlled independently of the airflow. Through the independent control over the burning rate of the synthetic polymers polymethylmethacrylate (PMMA) and polyoxymethylene (POM), it is demonstrated that flame geometry can be systematically varied as a function of the oxygen environment. Both polymers were studied in the Fire Propagation Apparatus using a constant mass loss rate (MLR) under varying oxidative environments (177 L min−1, 0 – 20.9 % vol O2). This study draws upon frameworks developed for co-flow burners, allowing the characteristics of a diffusion flame to be established as a function of the oxidative environment. Flames sustained under lower oxidative environments displayed decreased luminosity and anchoring, with the heat flux from the POM flame decreasing by 14.7 kW m−2 as the oxygen concentration decreased from 20.9 % to 9.25 %. By relating combustion emissions to the flame geometry, through the use of a constant MLR, the processes controlling the emissions from the burning of solids have been studied in a novel manner.
| Type: | Article |
|---|---|
| Title: | Assessing the effect of oxidizer on flame geometry and effluent composition from burning solids |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.firesaf.2025.104347 |
| Publisher version: | https://doi.org/10.1016/j.firesaf.2025.104347 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Pyrolysis, Burning rate, Flammability, Emissions, Flame shape, PMMA, POM, FPA |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10204241 |
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