Contribution to flashover modelling: Development of a validated numerical model for ignition of non-contiguous wood samples
| العنوان: | Contribution to flashover modelling: Development of a validated numerical model for ignition of non-contiguous wood samples |
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| المؤلفون: | Jean-Michel Most, Anthony Pearson, Andrej Horvat, Yehuda Sinai |
| المساهمون: | Laboratoire de combustion et de détonique (LCD), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | Fire Safety Journal Fire Safety Journal, Elsevier, 2009, 44, pp.779-788. ⟨10.1016/j.firesaf.2009.03.008⟩ |
| بيانات النشر: | Elsevier BV, 2009. |
| سنة النشر: | 2009 |
| مصطلحات موضوعية: | Convection, Materials science, 0211 other engineering and technologies, General Physics and Astronomy, Poison control, 020101 civil engineering, 02 engineering and technology, Thermal diffusivity, Combustion, 7. Clean energy, 0201 civil engineering, law.invention, law, General Materials Science, Physics::Chemical Physics, Safety, Risk, Reliability and Quality, ComputingMilieux_MISCELLANEOUS, 021110 strategic, defence & security studies, Waste management, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, General Chemistry, Mechanics, Ignition system, Heat flux, Thermal radiation, Pyrolysis |
| الوصف: | A computational model of flashover is presented that closely follows the experimental setup at CNRS-ENSMA-Poitiers. A propane burner with thermal power of 55 kW is used as a primary source of fire and square beech wood samples (30 mm×30 mm×5 mm) as fire spread targets. The computational model describes the wood pyrolysis with a progress variable. Using the conservation of heat fluxes at the solid–gas interface, the thermal diffusion in the wood samples is coupled with the convective and the radiative heat transfer in the ambient gas phase. The incoming heat flux at the upper surface of the wood samples reaches values between 20 and 30 kW/m2. With the ignition and subsequent combustion of the pyrolysis volatiles, the heat flux increases by approx. 12 kW/m2. The results show that the ignition of the wood samples is triggered at an approx. surface temperature of 650 K. Due to large local variations in incident heat flux, significant differences in the ignition times of the wood samples are observed. The comparison of the calculated and the experimentally measured temperature shows a good agreement for the first wood sample and the model predicts the ignition time very well. But for the second and the third wood samples the model overpredicts the temperature, which leads to a premature ignition of these wood samples. |
| تدمد: | 0379-7112 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a02841d1f609bb7f7b3a2ffc6ffc7452 https://doi.org/10.1016/j.firesaf.2009.03.008 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....a02841d1f609bb7f7b3a2ffc6ffc7452 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 03797112 |
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