密闭机舱双火源燃烧质量损失研究

在3 m×3 m×3.5 m的缩尺度船舶密闭机舱中，设置边长分别为10,15,20 cm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。

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

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, respectively, 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 typical combustion stages: initial, stable and extinguished, and the dimensionless spacing S/L of different oil pools shows a parabolic 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 double 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.