100号航空汽油池火燃烧特性试验研究

Experiment study on the burning characteristics of 100 aviation gasoline pool fire

从燃烧速率及热释放速率、火焰脉动特征、热辐射特性等方面研究了100号航空汽油池火的燃烧特性。通过电子天平实时采集数据并进行处理得到池火燃烧速率,利用全尺寸热释放速率测量系统测量池火热释放速率,通过图像处理技术对池火脉动特征进行分析,通过在火焰一定距离处布置热流计得到池火热辐射特性相关参数。结果表明:100号航空汽油池火稳定燃烧速率大于普通汽油燃烧速率,最大燃烧速率和衰减因子均大于普通汽油参数值;小尺寸池火热释放速率不稳定,随着油池尺寸的增大,热释放速率稳定性增强;池火火焰周期性脉动现象非常明显,脉动频率试验值与Pagni公式预测值接近;在油池液面高度产生的辐射强度随着无量纲距离L/D的增大呈指数衰减,拟合得到的曲线公式所对应参数值与油盘等效直径呈线性关系,通过此关系得到100号航空汽油池火热辐射统一方程。

This paper is mainly engaged in the study of the combus- tion characteristics of 100 aviation gasoline pool fire through experi- ments and theoretical analysis. As is known, pool fire caused by the fuel leakage is a typical source of disaster in chemical industry. Therefore, it is necessary to study its combustion characteristics of the fire in different sizes it may lead to, including burning rate, heat-re- lease rate, thermal radiation properties and flame pulsation. There- fore, in proceeding with our research, we have established a system for tracing the pool fire combustion characteristics in different scales with heat release rate experimental platform of the State Key Labora- tory of Fire Science. The experimental results enable us to gain the burning rate of gasoline pool fire by real-time data gathering by means of electronic balance. Meanwhile, ISO 9705 heat-releasing rate mea- surement system has confirmed the heat release rate. When CCD camera was used to capture the flame, we have succeeded in estab- lishing-image processing device for analyzing the flame pulsation. We got thermal radiation characteristics through the flame heat flux ar- ranged in a certain distance off the pool. The experiment results we have gained show that the burning characteristics of such gasoline pool fire eft different sizes under study may include burning rate, heat release rate, thermal radiation properties as well as the flame pulsa- tion. The experiment indicates that steady burning rate tends to be greater than the theoretical value of the regular gasoline, whereas the maximum burning rate and attenuation factor prove to be greater than the literature value of regular gasoline. However, the heat release rate of small-size pool proves ins/able whereas the heat release rate turns to be more and more stable with the increase of the oil pool size. In addition, the flame pulsation becomes so obvious that the flame can be divided into continuous and intermittent sections. While the experimental pulse frequency turns to become in conformity with the formula predicted value by Pagni, strong pool fire flame turbu- lence lead to a stronger pulse. As the curve comes up with the use of custom fitting function, the parameter values of the formula should be equivalent to a linear relation with the diameter, which helps us to gain the uniform equation of the gasoline pool fire radiation through the said relation.