室外变压器火灾燃烧特性全尺度实验研究

开展35 kV室外变压器全尺度火灾实验研究，探究变电站火灾燃烧特性。同时考虑4处火灾，在变压器不同位置设置火源，分析火焰传播情况、温度变化曲线，为变电站消防建设和应急救援提供理论支撑。研究表明：变压器火灾具有隐蔽、立体、多尺度的燃烧特征。多个尺度不一的立体火源在燃烧过程中存在多个火焰的相互碰触、合并行为；在充分燃烧阶段，变压器上部火焰存在火焰震荡、分离等不稳定现象。火焰形态在下方主要为贴壁火焰，在上方主要为扩散燃烧形成的连续火焰和间歇火焰；温度分布在垂直方向呈现逐渐降低的规律，在水平方向呈现中间温度高，两侧温度低的规律。

Full scale experimental research on combustion characteristics of outside transformer fire

The full scale fire experiment of 35 kV outdoor transformer was carried out to explore the burning characteristics of substation fire.Four fires at the same time were considered by setting fires at different position of transformer.The flame spread and temperature change were analyzed to provide theoretical support for substation fire construction and emergency rescue.The research showed that the transformer fire has hidden,three-dimensional and multi-scale combustion characteristics.In the process of combustion of fire sources with different scales,there are multiple flame touching and merging behaviors.In the stage of full combustion,the upper flame of the transformer is unstable,such as flame shock and separation.it is mainly attached wall flame under the transformer and continuous and intermittent flame formed by diffusion combustion above the transformer.The temperature gradually decreases in the vertical direction,while the temperature in the middle is high and the temperature on both sides is low in the horizontal direction.