倾斜状态汽油火焰传播特性的试验研究

借助高速摄像机,分析倾斜角度为0°、15°、30°及45°的狭长凹槽中汽油火焰传播影像,探讨主火焰区火焰形态、火焰结构、火焰传播速率随倾斜角度变化的规律。结果表明:在各倾斜角度下都可以观察到火焰前端的蓝色闪燃区及随后的橘红色主火焰区;随着倾斜角度增加,火焰结构的变化趋势为:在垂直汽油液面方向上火焰高度趋于稳定;在平行汽油液面方向上火焰传播平均速率V逐渐加快,且与倾斜角度θ之间呈指数关系:V=V0+A(1-e-θ/t)。

Experimental study of gasoline fame propagation characteristic under tilt condition

Using of high-speed camera,the images of gasoline flame propagating in a long and narrow groove with the angles θθ of 0°、15°、 30° and 45° were analyzed,shape and structure and spreading speed of the main flame changing with the angle were discussed.Results show that: a blue flashover zone ahead and an orange main zone behind are observed in each angles;and while the angle increased,the height of the flame in the vertical direction of the groove is being uniform,and the average speed V of the flame in the parallel direction of the groove is accelerating gradually,the relationship between V and θ is: V=V0+A(1-e-θ/t).