Abstract The assisting wind force effect on the transition and extension characteristics of the flame projecting outside the window of a compartment was experimentally investigated. The transition criteria, length, and maximum temperature profile of the external flame were studied. As the wind velocity increases, three states: namely a spill-like plume, horizontally ejected flame and no flame outside the window were identified in the experiments. The Froude number can be used to determine the three states of the external flames, with the critical values separating these stages being 2.3 and 6.4. Two length scales, l1 and l2 are proposed to modify the developed theories without a wind effect. The length scales are used to analyze the length and maximum temperature profile of the external flame. The dimensionless flame lengths are proportional to the 1.5 and 1.2 power of the dimensionless convective heat flow rate for the spill-like plume and horizontally ejected flame respectively. Correlations for the maximum temperature rises of the external flame are established between the dimensionless convective heat flow rate and the length (height) of the plume by taking into account the thermodynamic and dynamic effects of the external wind.

中文翻译：

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风对从具有相对开口的隔间突出的外部火焰的过渡和延伸特性的影响

摘要 实验研究了辅助风力对舱室窗外火焰的过渡和延伸特性的影响。研究了外部火焰的转变标准、长度和最高温度曲线。随着风速的增加，实验中识别出三种状态：即溢出状羽流、水平喷射火焰和窗外无火焰。弗劳德数可用于确定外部火焰的三种状态，分隔这些阶段的临界值为 2.3 和 6.4。提出了两个长度尺度 l1 和 l2，以在没有风效应的情况下修改已发展的理论。长度标尺用于分析外部火焰的长度和最高温度分布。无量纲火焰长度分别与溢出状羽流和水平喷射火焰的无量纲对流热流率的 1.5 和 1.2 次方成正比。通过考虑外部风的热力学和动力效应，在无量纲对流热流率和羽流长度（高度）之间建立了外部火焰最大温升的相关性。