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基于火灾双层模型思想及基本物理定律,通过分析单个水颗粒与热气流的相互作用,研究水颗粒群对火灾烟气层的影响,建立了水颗粒作用下火灾烟气层沉降的数学模型,模型与实验值的对比误差为±0.3 m.利用该模型模拟研究发现:增大喷头流量速率、减小水颗粒喷射夹角、减小水颗粒粒径会加剧烟气层沉降;在同一喷水条件下,低温、薄烟气层更易于沉降,当烟气层厚度薄于某一临界值时,烟气沉降距离会大幅度增加;常用的12.7 mm喷淋喷头的工作压力不宜大于20 m.该模型可有效缓解喷水对实际火灾烟气层的沉降作用.
Based on the idea of fire double-layer model and the basic laws of physics, the influence of water particles on the fire flue gas layer is studied by analyzing the interaction between individual water particles and the hot gas flow. A mathematical model is established for the settlement of fire flue gas layer under water particles. The comparison error between the model and the experimental value is ± 0.3 m. Using this model simulation study, it is found that: increasing the nozzle flow rate, reducing the angle between water particles and reducing the water particle size will aggravate the deposition of flue gas layer; Under the conditions, the low temperature and thin flue gas layer is more likely to settle. When the flue gas layer thickness is thinner than a certain critical value, the flue gas settling distance will greatly increase. The working pressure of the common 12.7 mm sprinkler should not exceed 20 m. The model can effectively alleviate the water spray on the actual fire flue gas deposition.