火灾情况下舱内对流换热的研究

IF 1.5 Q3 ENGINEERING, CHEMICAL
Philippe Onguene Mvogo, Olivier Zatao Samedi, Patrice Changement, J. Zaida, W. Nzié, Henri Ekobena Fouda, R. Mouangue
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引用次数: 1

摘要

根据隔室的几何形状,火灾时释放的大量烟雾往往会积聚在天花板上,从而形成热气体云。这些热气体和墙壁之间的热传递对火的发展起着决定性的作用。这些气体温度的升高可能导致诸如闪络和回风等危险现象。本文通过实验和数值模拟,研究了火灾中自然通风对室内热气体与墙体间对流换热的影响。因此,改变通风水平,首先准备在实验室内进行防火试验。其次,重点研究了这些试验的数值模拟,以估计火灾时近壁燃烧气体的速度场。将模拟结果与实验结果进行对比,验证了数值结果的正确性。对结果的全面外推表明,当房间的通风水平发生变化时,对流传热的幅度会根据火灾的情况而变化。结果表明:燃料控制火灾的对流换热系数随通风系数的增大而增大,而通风控制火灾的对流换热系数随通风系数的增大而减小,但仍保持在8.75 W⋅m−2⋅K−1附近。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigative Study on Convective Heat Transfer inside Compartment during Fire Situation
According to the geometry of compartments, quantities of smokes released during fire tend to accumulate at ceiling so as to form a cloud of hot gases. Heat transfer between these hot gases and walls is decisive for the development of fire. An increase in temperature of these gases could lead to dangerous phenomena such as flashovers and backdrafts. Owing to experiments and numerical simulation, the objective of the present paper is to investigate on the influence of natural ventilation on convective heat transfer between hot gases and walls of a room in fire. So, varying the ventilation level, it was firstly about to carry out fire tests in an experimental room. Secondly, study was focused on the numerical simulation of these tests so as to estimate velocity field of burnt gases near walls during fire. Validation of numerical results has been done by confronting simulated results to experimental results. A full-scale extrapolation of results enabled revealing that while the ventilation level in the room changes, the amplitude of convective heat transfer changes according to the regime of fire. It was shown that for the fuel-controlled fire, the convective heat transfer coefficient strongly increases with the ventilation factor, and for the ventilation-controlled fire, convective heat transfer coefficient weakly decreases with the ventilation factor and remains nevertheless close to value   8.75 W ⋅ m − 2 ⋅ K − 1 .
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来源期刊
Journal of Combustion
Journal of Combustion ENGINEERING, CHEMICAL-
CiteScore
2.00
自引率
28.60%
发文量
8
审稿时长
20 weeks
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