The fire induced pressure and its influence on ventilation flows within a compartment have not been studied in detail previously.In this research work, we have investigated the development of gas pressure and the resulting flows in compartment fires first experimentally, by burning a series of heptane pool and polyurethane mattress fires inside a real, 58.6 m^2 by 2.57 m high, apartment and then by carrying out numerical simulations of the experiments with the FDS code. The experiments were conducted with three different ventilation duct configurations to simulate three different airtightness conditions. The peak heat release rates were less than 1 MW and the burning times were about 180 s. The experimental results indicate that the gas pressure in relatively closed apartment can become high enough to revert the flows of the ventilation system, prevent escape through inwards-opening doors, and even break some structures. The peak gas temperatures under the ceiling of the burn room were about 300 C. The pool fires remained well-ventilated. The pressure ranges encountered in the experiments were between 100 Pa to 1650 Pa and the pressure occured within 50 s of ignition. We also report the FDS validation for this type of simulations and discuss the process of modelling the ventilation system and leakages.
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机译：之前尚未详细研究火灾引起的压力及其对车厢内通风流动的影响。在这项研究工作中，我们首先通过燃烧一系列庚烷，通过实验研究了气压的发展以及由此产生的车厢火灾中的流动。游泳池和聚氨酯床垫在真实的58.6 m ^ 2 x 2.57 m高的公寓内射击，然后使用FDS代码对实验进行数值模拟。使用三种不同的通风管道配置进行了实验，以模拟三种不同的气密性条件。峰值放热速率小于1 MW，燃烧时间约为180 s。实验结果表明，相对封闭的公寓中的气压可以变得足够高，以逆转通风系统的气流，防止通过向内打开的门逸出，甚至破坏某些建筑物。燃烧室顶棚下的最高气体温度约为300摄氏度。泳池大火保持良好通风。实验中遇到的压力范围在100 Pa至1650 Pa之间，并且压力在点燃后50秒内发生。我们还报告了此类仿真的FDS验证，并讨论了对通风系统和泄漏进行建模的过程。
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