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Design of Fire Ventilation System for an Underground Car Park by CFD Simulations

机译：CFD仿真对地下停车场灭火系统的设计

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摘要

The aim of this study is to design a fire ventilation system with impulse jet fans for an underground car park. With respect to the number of parameters that can affect the flow of smoke that need to be considered, there is a good chance of miscalculations when computing the overall fluid flow using conventional plain calculations. To avoid mistakes, visualize the fluid flow and also to directly compare the different design variants it can be practical to use CFD (Computational Fluid Dynamics) simulations. By CFD it is possible to better analyse and keep control of the fluid flow, heat transfer and other related phenomena. In this study, CFD simulations were used to design, test and compare two alternatives of a fire ventilation system. The two alternatives differed from each other in the location of the impulse jet fans and exhaust ventilation shafts, and in the ventilation intensity (10-times per hour versus 15-times per hour). The results have shown that the first alternative is not suitable as the car park was not sufficiently ventilated after 1500 seconds after the simulation had begun, whereas in the second alternative the smoke was almost completely exhausted and the visibility was substantially improved. The simulation results emphasize the important effect of design and location of the different elements on the functionality and efficiency of a fire protection system.
机译：本研究的目的是设计一个带有冲动喷射器的灭火系统，用于地下停车场。关于可以影响需要考虑的烟雾流量的参数的数量，在使用传统普通计算计算整体流体流动时存在良好的错误。为了避免错误，可视化流体流动，并直接比较不同的设计变体，可以使用CFD（计算流体动力学）模拟。通过CFD，可以更好地分析和保持对流体流动，传热和其他相关现象的控制。在本研究中，CFD模拟用于设计，测试和比较灭火系统的两个替代方案。这两个替代方案在脉冲喷射风扇和排气通风轴的位置彼此不同，并且在通风强度（每小时10次与每小时15次）的通风强度（10次）。结果表明，第一种替代方案不适合，因为在模拟开始后1500秒后停车场没有充分通风，而在第二种替代方案中，烟雾几乎完全耗尽，并且显着改善了可见性。仿真结果强调了不同元素的设计和位置对防火系统的功能和效率的重要影响。

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