Abstract In this study, a numerical sensitivity analysis was performed to determine the fire suppression time for a large number of water mist nozzles in a large fire compartment. Fire simulations were performed using FDS (Fire dynamics simulator) 6.5.2 under the same condition as the test scenario 5 of the International Maritime Organization (IMO) 1165 test protocol. The sensitivities of input parameters including cell size, extinguishing coefficient (EC), droplets per second (DPS), and peak heat release rate (HRR) of fuel were investigated in terms of the normalized HRR and temperature distribution in the compartment. A new method of determining the fire suppression time using FDS simulation was developed, based on the concept of the cut-off time by cut-off value (COV) of the heat release rate per unit volume (HRRPUV) and the cooling time by the HRR cooling time criteria value (CTCV). In addition, a method was developed to determine the average EC value for the simulation input, using the cooling time and cut-off time.

中文翻译：

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大型火灾试验室多细水雾喷嘴灭火时间的数值分析

摘要 在本研究中，通过数值敏感性分析来确定大型防火分区中大量细水雾喷嘴的灭火时间。在与国际海事组织 (IMO) 1165 测试协议的测试场景 5 相同的条件下，使用 FDS（火灾动力学模拟器）6.5.2 进行了火灾模拟。根据标准化的 HRR 和隔室中的温度分布，研究了输入参数的敏感性，包括电池尺寸、灭火系数 (EC)、每秒液滴 (DPS) 和燃料的峰值热释放率 (HRR)。开发了一种使用 FDS 模拟确定灭火时间的新方法，基于单位体积热释放率 (HRRPUV) 的截止值 (COV) 的截止时间和 HRR 冷却时间标准值 (CTCV) 的冷却时间的概念。此外，开发了一种方法来确定模拟输入的平均 EC 值，使用冷却时间和截止时间。