Abstract Thermally-thin compartment fire studies are a reasonable approach to understand fire dynamics in informal settlements, where dwellings built with such materials (e.g. steel sheets) are commonly found. Since the number of people living in informal settlements is growing (currently over 1 billion), fire safety engineering research is of major importance for reducing fire occurrence, loss of life, livelihood, and property. This work studied numerically a set of thermally-thin and thermally-thick walled small-scale (1/4 scaled ISO-9705 room) compartment fires in a wind tunnel. This work aims to understand the effect of wind on the heat release rate necessary to reach the onset of flashover (HRRfo) inside the compartment by varying the wind velocity and direction (on the side or back wall). It was found that HRRfo increased with wind velocity for both wind directions for thermally-thin boundaries, while HRRfo decreased with wind velocity for thermally-thick boundaries. It was also found that the wind effect was more significant when blowing on the side wall. It was shown that those results were caused by heat transfer losses through walls and by wind-induced pressures at the doorway; the former being the driving mechanism for thermally-thin walled compartments and the later for thermally-thick bounded compartments.

中文翻译：

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风对具有薄热边界和热厚边界的小尺度隔间内闪络发生的影响

摘要 热薄隔间火灾研究是了解非正规住区火灾动力学的合理方法，在那里通常可以找到用这种材料（例如钢板）建造的住宅。由于居住在非正规住区的人数不断增加（目前超过 10 亿），消防安全工程研究对于减少火灾发生、生命、生计和财产损失具有重要意义。这项工作对风洞中的一组热薄壁和热厚壁小规模（1/4 比例 ISO-9705 房间）隔间火灾进行了数值研究。这项工作旨在通过改变风速和风向（在侧面或后壁上）来了解风对达到隔室内闪络开始 (HRRfo) 所需的热释放率的影响。结果表明，热薄边界的 HRRfo 随两个风向的风速而增加，而热厚边界的 HRRfo 随风速下降。还发现在侧壁上吹风时，风效应更为显着。结果表明，这些结果是由墙壁传热损失和门口风压引起的。前者是热薄壁隔室的驱动机制，后者是热厚有界隔室的驱动机制。结果表明，这些结果是由墙壁传热损失和门口风压引起的。前者是热薄壁隔室的驱动机制，后者是热厚有界隔室的驱动机制。结果表明，这些结果是由墙壁传热损失和门口风压引起的。前者是热薄壁隔室的驱动机制，后者是热厚有界隔室的驱动机制。