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Experimental performance evaluation of water mist fire suppression system.

机译：水雾灭火系统的实验性能评估。

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摘要

The present thesis attempts to understand the performance of the water mist fire suppression system, including the water mist nozzles and the whole system operation under different conditions through experiments and theoretical analysis. The impacts of the water mist nozzle, different fire parameters on the performance of the fire as well as the quantitative correlations between the fire size, i.e. the heat release rate of the fire and the room temperature change with respect to the extinguishing time were studied.;A comprehensive literature review of the studies of the water mist system conducted by different researchers and organizations in different countries has been carried out. It was found that under the ideal situation, water mist discharged is assumed to evaporate completely after coming into contact with the flame. With a proper design, the WMFSS can be used to extinguish electrical fires without danger. But the WMFSS was also found to have some limitations, for example its extinguishing performance is case-dependent and highly relates to the fire scenarios concerned. No "rule of thumb" type design standard is available. And three common types of water mist nozzles are widely applied including the impinging type, pressure-jet type and twin-fluid air-atomizing type.;30 full-scale experiments have been conducted. In the full-scale tests, different ventilation conditions, fire sizes, discharging methods of water mist, pre-burn time of the fire and the fire types were chosen as the testing parameters. The experimental results revealed that under the same operation condition of pressure and flow rate, factors like the fire size, type of fuel, pre-hum time and discharging method affected the performance of the WMFSS in different ways. Through results analysis, it was found that the extinguishing time is proportional to the heat release rate for liquid fires. The steady state room air temperature after extinguishment also increased with the heat release rate. The peak temperature difference was directly proportional to the extinguishing time. Some experimental findings agreed with the literature results. The study results are helpful to understand the effectiveness of the water mist system when facing different fire challenges.
机译：本文试图通过实验和理论分析来了解水雾灭火系统的性能，包括水雾喷嘴和整个系统在不同条件下的运行情况。研究了水雾喷嘴，不同的着火参数对着火性能的影响以及着火大小（即着火的放热率和室温随灭火时间的变化）之间的定量关系。 ；对不同国家的不同研究者和组织进行的水雾系统研究进行了全面的文献综述。发现在理想情况下，假定排出的水雾与火焰接触后完全蒸发。通过适当的设计，WMFSS可以用于灭火，而不会造成危险。但是还发现WMFSS具有某些局限性，例如其灭火性能取决于具体情况，并且与相关的火灾情况高度相关。没有“经验法则”类型的设计标准。并广泛应用了三种常见的水雾喷嘴类型：撞击型，压力喷射型和双流体空气雾化型。进行了30次全尺寸实验。在全面测试中，选择了不同的通风条件，火势大小，水雾的排放方法，火的预燃时间和火种作为测试参数。实验结果表明，在相同的压力和流量运行条件下，着火尺寸，燃料类型，预嗡嗡时间和排放方法等因素以不同的方式影响WMFSS的性能。通过结果分析，发现灭火时间与液体着火的放热率成正比。灭火后的稳态室内空气温度也随着放热率的升高而升高。峰温差与灭火时间成正比。一些实验结果与文献结果一致。研究结果有助于理解面对不同火灾挑战时水雾系统的有效性。

著录项

  • 作者

    Zhu, Ning.;

  • 作者单位

    Hong Kong Polytechnic University (Hong Kong).;

  • 授予单位 Hong Kong Polytechnic University (Hong Kong).;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 314 p.
  • 总页数 314
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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