Effects of Water Mist System on a Controlled Fire
Effects of Water Mist System on a Controlled Fire
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细水雾系统对受控火灾的影响
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Ho
中科院分区：
文献类型：
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作者：
J. Ho
关于实施水雾系统的现行立法要求对其预期用途进行全面测试，这涉及大量资金，使潜在用户望而却步。这激发了对精确水雾模拟的需求。针对一种特定的高压细水雾系统“Danfoss 1910”，研究了这种可能性的程度，并研究了其对不同热释放速率的受控火灾的影响。精确模拟水雾系统的概念也被研究，其中组合使用额外的空气入口，障碍物（湍流）网格和降低的初始颗粒速度显示出最佳性能。采用水平方向的水雾，以减少水雾喷雾和浮力羽流之间的直接相互作用。将准稳态模型的计算结果与模拟结果和实验数据进行了比较，发现存在很大的差异。发现使用的四分之一比例ISO房间角落太小，导致外壳内循环水平过高;妨碍了对灭火机制（如气相冷却和氧气消耗）的正确评估。其中一个结论是需要汇编更大规模的测试验证数据，以形成基线参考。
Current legislation regarding implementation of water mist system(s) requires full scale testing specific to its intended use which involves extensive funding that discourages potential users. This motivates the desire for accurate water mist simulation. The extent to this possibility is studied for a specific high pressure water mist system, “Danfoss 1910”, and its effect on controlled fires of different heat release rates were studied. Concepts to accurately simulate the water mist system were also looked into, where the combined use of an additional air inlet, obstruction (turbulence) meshes and reduced initial particle velocity showed the best performance. A horizontal water mist orientation was adopted to reduce the direct interaction between water mist spray and buoyant plumes. The results attained from a quasi steady state extinguishment model, simulations and experimental data were compared and vast discrepancies were discovered. The quarter scale ISO room corner used was found to be too small which created high levels of circulation within the enclosure; hindering the proper assessment of extinguishing mechanisms such as gas phase cooling and oxygen depletion. One of the conclusions is the need to compile larger scale tests validation data to form a baseline reference.