Abstract The flame spread above oil surface is affected by the ambient wind, including the velocity and direction of the wind. In current paper, the experiments of flame spread above jet fuel of RP-3 with different pool widths are conducted to find out the variations of flame tilt angle under the influence of longitudinally forced air flows. It is found that as the longitudinally forced air flow speed increases from 0 to 2.57 m/s, the flame tilt angle increases from 0° to about 75°, regardless of directions of air flows. The new non-dimensional parameter, characteristic size ratio λ = d / D is introduced into the Welker et al.’s model. The tangent value of the flame tilt angle is directly proportional to α Ri - β d / D γ under both opposed and concurrent flame spreads. The mechanism of flame inclination under the effect of longitudinally forced air flow is analyzed according to the coupling of combustion and gas flows. The flame inclination is principally determined by the coupled effects of vertical buoyancy and horizontally forced air flow.

中文翻译：

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纵向强制气流作用下喷气燃料火焰蔓延的火焰倾斜角实验与建模研究

摘要 油面火焰蔓延受环境风的影响，包括风速和风向。在本文中，进行了不同池宽 RP-3 喷气燃料上方火焰蔓延的实验，以找出纵向强制气流影响下火焰倾斜角的变化。发现随着纵向强制气流速度从 0 增加到 2.57 m/s，火焰倾斜角从 0° 增加到大约 75°，而与气流方向无关。Welker 等人的模型中引入了新的无量纲参数，特征尺寸比 λ = d / D。火焰倾斜角的正切值与 α Ri - β d / D γ 成正比，无论是在对向火焰传播还是同时火焰传播下。根据燃烧与气流的耦合，分析了纵向受力气流作用下火焰倾斜的机理。火焰倾斜主要由垂直浮力和水平强制气流的耦合效应决定。