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首页> 外文期刊>Journal of loss prevention in the process industries >Optimization of water mist droplet size by using CFD modeling for fire suppressions
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Optimization of water mist droplet size by using CFD modeling for fire suppressions

机译：通过CFD建模优化灭火的水雾滴尺寸

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With recent developments in sprinkler technology, water mist system is becoming more and more useful in fire suppressions. However, regulations on water mist system are inadequate, because most of them are based on experimental results. The computational method is an efficient way to make validations and optimize droplet size distribution of water mists. In this work, a computational fluid dynamics (CFD) model and a fire dynamics simulator (FDS) code were used to analyze effects of fire suppression using water mists with different droplet sizes. By using numerical methods, the interaction between water mist and fire could be better understood. The range of droplet size was determined based on the NFPA 750 standard. The fire extinguishing times of different droplet sizes were calculated by running the FDS code. After running the FDS code for different droplet size ranges, the optimal droplet size range was obtained. With the increase of droplet sizes, the fire extinguishing time first fluctuated and then increased. An optimal droplet size range was determined to have the best suppression effectiveness with the shortest fire extinguishing time and less water consumption. It should be noted that there are limitations for the CFD study since the real circumstance of fire is more complicated. (C) 2016 Elsevier Ltd. All rights reserved.
机译：随着喷头技术的最新发展，水雾系统在灭火中正变得越来越有用。然而，关于水雾系统的规定是不充分的，因为它们大部分是基于实验结果的。该计算方法是进行验证和优化水雾的液滴尺寸分布的有效方法。在这项工作中，使用了计算流体动力学（CFD）模型和火灾动力学模拟器（FDS）代码来分析使用具有不同液滴大小的水雾的灭火效果。通过使用数值方法，可以更好地了解水雾与火之间的相互作用。液滴尺寸范围是根据NFPA 750标准确定的。通过运行FDS代码，计算出不同液滴尺寸的灭火时间。在针对不同液滴尺寸范围运行FDS代码后，获得了最佳液滴尺寸范围。随着液滴尺寸的增加，灭火时间首先波动，然后增加。确定最佳的液滴尺寸范围，以具有最佳的灭火效果，最短的灭火时间和更少的水消耗。应当指出的是，由于火灾的实际情况更加复杂，因此CFD研究存在局限性。 （C）2016 Elsevier Ltd.保留所有权利。

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