Title: Calculation Analysis on the Fuel Preheating Mechanisms in Surface Fire Spread over a Horizontal Fuel Bed // Proceedings of the Ninth International Seminar on Fire and Explosion Hazards. Vol. 2: 21-26 April 2019, Saint Petersburg, Russia
Creators: Xie X.; Liu N.; Yuan X.; Li H.; Zhang L.
Organization: State Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment; University of Science and Technology of China
Imprint: Saint Petersburg, 2019
Collection: Общая коллекция
Document type: Article, report
File type: PDF
Language: English
DOI: 10.18720/SPBPU/2/k19-91
Rights: Свободный доступ из сети Интернет (чтение, печать, копирование)

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This work aims to investigate the effects of heat radiation and convection in the near field and far field of a spreading flame front over a horizontal fuel bed. Model calculations are made to examine different fuel preheating mechanisms that affect the fire spread. The results indicate that the convective cooling effect is important and could not be ignored. For the fuel elements in the near field, the radiation from the flame front and the combustion zone is not sufficient for fuel preheating, and the mechanism of convective heating should be considered. The convective cooling of the fuel bed has a considerable long influence range ahead of the flame front, while the influence range of convective heating is in a shorter length scale. The flame radiation on fuel preheating takes effect in the whole field. There is a sharp increase of the temperature when fuel elements get closer to the flame front in the near field due to the combined effects of three heating mechanisms. The contributions of the flame radiation, the combustion zone radiation and the convective heating to fuel preheating are of the same magnitude in the near field. The combustion cooling takes effect in the far field, while the convective cooling coefficient affects both far field and near field.

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