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Fully Coupled Three-Dimensional Simulation of Downward Flame Spread over Combustible Material

Three-dimensional simulations of laminar flame propagating downwards the vertical surface of a rigid polyurethane slab heated by a radiative panel are presented and compared with the measurement data. The gas-phase model (ANSYS Fluent) allows for finite-rate volatile oxidation, soot formation and ox...

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Autores principales: Snegirev, A., Kuznetsov, E., Korobeinichev, O., Shmakov, A., Paletsky, A., Shvartsberg, V., Trubachev, S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9571259/
https://www.ncbi.nlm.nih.gov/pubmed/36236083
http://dx.doi.org/10.3390/polym14194136
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author Snegirev, A.
Kuznetsov, E.
Korobeinichev, O.
Shmakov, A.
Paletsky, A.
Shvartsberg, V.
Trubachev, S.
author_facet Snegirev, A.
Kuznetsov, E.
Korobeinichev, O.
Shmakov, A.
Paletsky, A.
Shvartsberg, V.
Trubachev, S.
author_sort Snegirev, A.
collection PubMed
description Three-dimensional simulations of laminar flame propagating downwards the vertical surface of a rigid polyurethane slab heated by a radiative panel are presented and compared with the measurement data. The gas-phase model (ANSYS Fluent) allows for finite-rate volatile oxidation, soot formation and oxidation, emission, transfer, and absorption of thermal radiation. The solid-phase model Pyropolis considers heat transfer across the material layer and generation of combustible volatiles in thermal decomposition of the material. Kinetic model of material decomposition is derived to obey the microscale combustion calorimetry data for different heating rates. Transient behavior of propagating flame and pyrolysis zone, as well as spatial distributions of heat flux components, temperature, and mass burning rates over the specimen surface are examined. Variation of the thermal properties of the material during its thermal decomposition, as well as the specimen surface emissivity and reradiation are shown to be the important issues strongly affecting model predictions. Two distinct modes of counterflow flame spread, thermal and kinetic, are identified. In the thermal mode corresponding to fast chemistry in the gaseous flame, the flame propagation velocity is governed by the heating rate of the combustible material ahead of the flame front. Alternatively, in the kinetic mode, it is limited by the burning velocity of the volatile-air mixture forming ahead of the flame front. Simulation results are favorably compared with the measured propagation velocity.
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spelling pubmed-95712592022-10-17 Fully Coupled Three-Dimensional Simulation of Downward Flame Spread over Combustible Material Snegirev, A. Kuznetsov, E. Korobeinichev, O. Shmakov, A. Paletsky, A. Shvartsberg, V. Trubachev, S. Polymers (Basel) Article Three-dimensional simulations of laminar flame propagating downwards the vertical surface of a rigid polyurethane slab heated by a radiative panel are presented and compared with the measurement data. The gas-phase model (ANSYS Fluent) allows for finite-rate volatile oxidation, soot formation and oxidation, emission, transfer, and absorption of thermal radiation. The solid-phase model Pyropolis considers heat transfer across the material layer and generation of combustible volatiles in thermal decomposition of the material. Kinetic model of material decomposition is derived to obey the microscale combustion calorimetry data for different heating rates. Transient behavior of propagating flame and pyrolysis zone, as well as spatial distributions of heat flux components, temperature, and mass burning rates over the specimen surface are examined. Variation of the thermal properties of the material during its thermal decomposition, as well as the specimen surface emissivity and reradiation are shown to be the important issues strongly affecting model predictions. Two distinct modes of counterflow flame spread, thermal and kinetic, are identified. In the thermal mode corresponding to fast chemistry in the gaseous flame, the flame propagation velocity is governed by the heating rate of the combustible material ahead of the flame front. Alternatively, in the kinetic mode, it is limited by the burning velocity of the volatile-air mixture forming ahead of the flame front. Simulation results are favorably compared with the measured propagation velocity. MDPI 2022-10-02 /pmc/articles/PMC9571259/ /pubmed/36236083 http://dx.doi.org/10.3390/polym14194136 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Snegirev, A.
Kuznetsov, E.
Korobeinichev, O.
Shmakov, A.
Paletsky, A.
Shvartsberg, V.
Trubachev, S.
Fully Coupled Three-Dimensional Simulation of Downward Flame Spread over Combustible Material
title Fully Coupled Three-Dimensional Simulation of Downward Flame Spread over Combustible Material
title_full Fully Coupled Three-Dimensional Simulation of Downward Flame Spread over Combustible Material
title_fullStr Fully Coupled Three-Dimensional Simulation of Downward Flame Spread over Combustible Material
title_full_unstemmed Fully Coupled Three-Dimensional Simulation of Downward Flame Spread over Combustible Material
title_short Fully Coupled Three-Dimensional Simulation of Downward Flame Spread over Combustible Material
title_sort fully coupled three-dimensional simulation of downward flame spread over combustible material
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9571259/
https://www.ncbi.nlm.nih.gov/pubmed/36236083
http://dx.doi.org/10.3390/polym14194136
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