密闭机舱双火源燃烧质量损失研究

Research on mass loss of double fire sourcesin a sealed ship engine room

在3m×3m×3.5m的缩尺度船舶密闭机舱中,设置边长分别为10,15,20cm的正方形双油池,试验研究双油池不同间距下的燃烧速率变化规律。结果表明:密闭舱室内的双油池火可分为初始、稳定、熄灭三个典型燃烧阶段,不同面积油池的无量纲间距S/L与燃烧速率之间呈现抛物线关系且质量损失率达到峰值时S/L的阈值在0.70~0.85,这与开放空间以及隧道半封闭空间下的双火源发展有很明显的区别。在此基础上,给出了密闭舱室内修正间距S的无量纲热释放速率预测模型。

The fire experiments were carried out in a 3 m(length)×3 m(width)×3.5 m(height)confined cabin with square double oil pools with side lengths of 10,15,20 cm,re-spectively,at different spacings to investigate the variation law of combustion rate.The results show that the double oil pool fire in the confined compartment can be divided into three typi-cal combustion stages:initial,stable and extinguished,and the dimensionless spacing S/L of different oil pools shows a para-bolic relationship with the combustion rate and the threshold value of S/L at the peak of mass loss rate is between 0.70 and 0.85,which is obviously different from the development of dou-ble fires in open space and tunnel semi-enclosed space.On this basis,a prediction model for the dimensionless heat release rate in a confined compartment with a modified spacing S is given.