| 无火源施放后超细微粒灭火剂运动特性研究 |
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| 引用本文： | 华敏,殷志平,潘仁明.无火源施放后超细微粒灭火剂运动特性研究[J].中国安全科学学报,2011,21(9). |
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| 作者姓名： | 华敏 殷志平 潘仁明 |
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| 作者单位： | 1. 南京理工大学化工学院,南京210094;南京工业大学火灾与消防工程研究所,南京210009;江苏省城市与工业安全重点实验室,南京210009
2. 南京理工大学化工学院,南京,210094 |
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| 摘 要： | 超细微粒灭火剂施放后的运动过程直接影响其灭火效果。通过数值模拟及试验研究灭火剂微粒施放后的流动、扩散和沉降等运动特性。模拟结果表明,灭火剂微粒施放后,向下运动到灭火室底部并撞击后向侧壁运动,随后向顶部运动,易在壁面及壁面底角处聚集。试验表明,微粒的运动分喷射运动和沉降扩散2个过程。前者微粒在驱动气流作用下在灭火室顶部、底部及墙壁处积聚,浓度较高。后者微粒主要受重力作用发生沉降,并在湍流气流作用下进行无规则扩散运动,导致灭火室顶部浓度最低;在灭火室垂直方向的一半高度处,浓度较高但波动剧烈;在灭火室底部,当喷射结束后有一个短暂的浓度低谷,随着微粒发生沉降,浓度逐渐升高。喷射压力对灭火剂的运动及浓度分布影响很大,压力过高或过低都会影响灭火剂微粒的全淹没灭火效果。根据试验结果,喷射压力为1.0 MPa时灭火效果较好。
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| 关 键 词： | 超细微粒灭火剂 运动特性 数值模拟 试验研究 浓度分布 |
Research on Moving Characteristics of Superfine Fire Extinguishing Powder Released in Non-fire Room |
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| HUA Min,YIN Zhi-ping,PAN Ren-ming.Research on Moving Characteristics of Superfine Fire Extinguishing Powder Released in Non-fire Room[J].China Safety Science Journal,2011,21(9). |
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| Authors: | HUA Min YIN Zhi-ping PAN Ren-ming |
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| Institution: | HUA Min1,2,3 YIN Zhi-ping1 PAN Ren-ming1(1 School of Chemical Engineering,Nanjing University of Science & Technology,Nanjing Jiangsu 210094,China 2 Institute of Fire Science and Technology,Nanjing University of Technology,Nanjing Jiangsu 210009,China 3 Jiangsu Key Laboratory of Urban and Industrial Safety,China) |
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| Abstract: | The movement process of superfine fire extinguishing power released affects fire extinguishing effect.Movement characteristics of the powder released were researched by numerical simulation and experiment.Simulation results indicated that the powder firstly moved to the bottom,and then to the side wall,and last to the top.And the powder more easily accumulated at the side wall and the corner of the bottom.Experiment results indicated that the powder had two movement processes.One was the jetting movement al... |
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| Keywords: | superfine fire extinguishing powder movement characteristic numerical simulation experimental research concentration distribution |
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