Numerical model of aerial drop characteristic of mass firefighting units for aerial firefighting

IF 3.4 3区 工程技术 Q2 ENGINEERING, CIVIL Fire Safety Journal Pub Date : 2024-09-13 DOI:10.1016/j.firesaf.2024.104263
Xuan Li , Haoran Sun , Dong Lin , Haitao Hu , Yang Wu , Chengyun Wu , Chenxi Pan , Xinyi Yang
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Abstract

The aerial drop characteristic of mass firefighting units has a significant influence on the effectiveness of aerial firefighting. In order to accurately describe the aerial drop characteristic of mass firefighting units, a numerical model covering the fundamental stages of the whole operation process was developed in the present study. In the model, mass firefighting units' filling and discharging processes are simulated by the discrete element method; the falling process is simulated by aerodynamic analysis, and the ground pattern characteristics are obtained. The model validation shows that, the numerical result agrees well with the experimental result with a maximum deviation of 14 %. The initial velocity distribution characteristic remains constant with varying filling amounts, and the mass fire firefighting units' initial velocities at different times follow a special normal distribution; the standard deviation of the initial velocities’ distribution primarily determines the width of mass firefighting units' ground pattern, while initial velocity and filling amount primarily determine the length of the ground pattern; the maximum coverage level is about 10 L/m2.

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用于空中灭火的大规模灭火装置空投特性的数值模型
大规模灭火装置的空投特性对空中灭火的效果有重要影响。为了准确描述大规模灭火装置的空投特性,本研究建立了一个涵盖整个操作过程基本阶段的数值模型。在该模型中,采用离散元法模拟了质量灭火单元的充填和排出过程,通过空气动力学分析模拟了下落过程,并得到了地面形态特征。模型验证结果表明,数值结果与实验结果吻合良好,最大偏差为 14%。不同填充量下的初速度分布特征保持不变,不同时间的群火灭火单元初速度服从特殊正态分布;初速度分布的标准偏差主要决定了群火灭火单元地面形态的宽度,而初速度和填充量主要决定了地面形态的长度;最大覆盖水平约为 10 L/m2。
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来源期刊
Fire Safety Journal
Fire Safety Journal 工程技术-材料科学:综合
CiteScore
5.70
自引率
9.70%
发文量
153
审稿时长
60 days
期刊介绍: Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.
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