变压器油池火非稳态燃烧特性实验研究

Study on the unsteady combustion characteristics of transformer oil pool fire

为研究变压器油的非稳态燃烧特性,搭建变压器油燃烧实验平台,开展不同油池直径的池火实验,系统分析油池直径对变压器油非稳态燃烧的影响,定性、定量研究不同油池直径对燃烧速率、火焰脉动频率等的影响。结果表明:变压器油池火燃烧过程可以划分为:初期增长阶段、充分发展阶段和衰减阶段。其中充分发展阶段又可以根据燃烧速率的变化特征分为准稳态燃烧阶段和沸腾燃烧阶段。燃烧速率随油池直径的增大而增大。准稳态燃烧阶段中,火焰脉动频率与油池直径呈负相关,油池直径越大,火焰脉动频率越小。

In order to study the unsteady combustion character-istics of transformer oil,a experimental platform for transform-er oil combustion was set up.The influence of oil pool diameter on the unsteady combustion of transformer oil was systematical-ly analyzed,and the influence of different oil pool diameter on combustion rate and flame fluctuation frequency was studied qualitatively and quantitatively.The results show that the com-bustion process of transformer pool fire can be divided into three stages:initial growth stage,full development stage and at-tenuation stage.The fully developed stage can be divided into quasi steady combustion stage and boiling combustion stage ac-cording to the characteristics of combustion rate.The combus-tion rate increases with the increase of oil pool diameter.In the quasi steady combustion stage,the flame pulsation frequency is negatively correlated with the oil pool diameter.The larger the oil pool diameter is,the smaller the flame pulsation frequency.