通风环境中不同油水比例柴油池火的燃烧特性

在不同风速和油水比例条件下进行柴油池火实验,通过对火场温度、辐射热通量、燃料质量损失速率的测定和喷溅现象的观察,分析通风环境和油水比例对柴油池火燃烧特性的影响.结果表明,自然通风条件下,油水体积比1∶1的柴油池火在旺盛阶段一直处于沸溢的状态,并伴随连续性喷溅,火焰温度及辐射热通量均达到了最大值;随油水体积比的减小,火焰温度和辐射热通量降低,喷溅频率和剧烈程度降低.当风速增加至1.0 m/s时,通风对柴油池火的促进作用占主导地位,池火旺盛阶段持续时间增长;风速增加到1.5 m/s时,柴油池火旺盛阶段持续时间缩短,通风对池火的负面影响占据了主导地位.

Combustion Characteristics of Diesel Pool Fire with Different Water Ratios in Ventilation Environment

Diesel pool fire experiments on different diesel water ratios were conducted under various ventilation conditions. The flame temperature， the radiation heat flux and the mass loss rate were measured， and the fire splash phenomenon was observed in order to analyze the combustion characteristics and the diesel pool fire spread rules. Results show that the diesel pool fire with 1∶1 diesel water ratio is always in the boilover status and the splash continuously occurs in the fire developed stage under natural ventilation conditions; both the temperature and the radiant heat flux reach the maximum value in the continuous splash. With the decreasing of the diesel water ratio， the flame temperature and the radiant heat flux are reduced and the frequency and the intensity of splashing are reduced either. If the air velocity is increased to 1.0m/s， the combustion is intensified significantly by the ventilation speed and the duration time of the developed stage of fire is increased. When the air velocity is further increased to 1.5m/s， the pool fire is hard to reach the developed stage or only last for a short time， which illustrates the negative impact of ventilation velocity increasing.