航空煤油薄油层燃烧特性实验研究

为研究薄油层燃烧特性，开展航空煤油薄层油池火实验，分析油品燃烧的整个过程、燃烧速率、火焰高度和辐射反馈等参数随时间的变化规律。结果表明:整个薄层燃烧过程除发展、稳定和熄灭阶段外，还存在薄层燃烧衰减阶段。稳定阶段的燃烧速率与初始油层厚度相关，但随着厚度的增加其逐渐趋于稳定；薄层燃烧衰减阶段，燃烧速率会随着实时油层厚度的下降逐渐降低。对比火焰高度的实测值和模型预测值发现，Heskestad模型的预测更接近实际结果；燃烧发展阶段后，火焰辐射反馈基本维持稳定，受初始厚度的影响较小，但辐射透射强度会随着油层厚度的降低而增加，且增速逐渐加快，表明辐射透射在薄层燃烧衰退阶段中起到关键作用。结合辐射透射的变化规律，将辐射反馈分为可吸收和不可吸收2部分，并提出用于预测辐射透射大小的经验模型。

Experimental study on burning characteristics of thin layer aviation kerosene

In order to study the burning characteristics of thin layer oil,the experiments on the pool fire of thin layer aviation kerosene were carried out,and the change laws of the whole burning process,burning rate,flame height,radiation feedback and other parameters with time were analyzed.The results showed that the whole burning process of thin layer existed the stage of thin layer burning attenuation besides the stages of development,steady and extinguishment.The burning rate in the steady stage was related to the initial thickness of oil layer,but it tended to be stable gradually with the increase of thickness.In the stage of thin layer burning attenuation,the burning rage decreased gradually with the decrease of real time oil layer thickness.Through comparing the measured values and predicted values by models of flame height,it showed that the prediction results of Heskestad model were more approaching to the actual results.After the stage of burning development,the radiation feedback of flame remained to be stable basically,which was slightly affected by the initial thickness.However,the radiative penetration intensity increased with the decrease of oil layer thickness,and the increasing rate accelerated gradually,which showed that the radiative penetration played the key function in the stage of thin layer burning attenuation.Combined with the variation laws of radiative penetration,the radiation feedback was divided into two parts of absorbable and non absorbable,and an empirical model for predicting the radiative penetration was put forward.