ABSTRACT

This paper quantifies experimentally the effect of ventilation in diesel pool fire (d = 0.6 m) in a cubical compartment of 64 m³ with ventilation opening factor in range of 0.088–2.828 $m^{5/2}$. The work is addressed to fire safety in nuclear power plant in which ventilated enclosure are frequently used for chemical processing of flammable fuels. In present work, fuel mass loss rate, global CO concentration, global CO/CO₂ yield, flame temperature, global equivalence ratio, doorway temperature with velocity profile, and heat flux are measured to predict the effect of ventilation in compartment fire. Ventilation with test 3 is noted as critical opening i.e. after that mass loss rate suddenly decreased. It is also observed that compartment fire is affected more by varying door height rather than varying door width. Unpredictably, global CO emission are obtained nearly the same regardless of doorway opening. Combustion efficiency is found to be in range of 0.39–0.93. Results showed that reduction in ventilation results in oscillating flame behavior and increase in upper layer gas temperature. Present data correlated well under thermal scaling analysis. The results shown in present work can be used as an input to fire hazard analysis in nuclear power plants.

摘要

本文通过实验量化了柴油池火灾 ( d = 0.6 m) 中通风效果在 64 m ³的立方体隔间中的通风效果，通风开口系数在 0.088–2.828 范围内${米}^{5/2}$. 这项工作涉及核电厂的消防安全，其中通风外壳经常用于易燃燃料的化学处理。在目前的工作中，燃料质量损失率、全球 CO 浓度、全球 CO/CO ₂测量产量、火焰温度、全局当量比、门洞温度和速度分布和热通量，以预​​测隔间火灾中通风的效果。测试 3 的通风被记录为临界开口，即在该质量损失率突然下降之后。还观察到，隔间火灾更多地受到门高度变化而不是门宽度变化的影响。出乎意料的是，无论门口是否打开，全球二氧化碳排放量几乎相同。燃烧效率被发现在 0.39–0.93 的范围内。结果表明，通风量的减少会导致火焰的振荡行为和上层气体温度的升高。目前的数据在热缩放分析下具有很好的相关性。目前工作中显示的结果可用作核电厂火灾危险分析的输入。