Wind-driven fires were experimentally-investigated to understand the influence of varying flow conditions on the local burning behavior of a condensed fuel surface. These flames imitate the fire dynamics of hazardous fires occurring in a forced-flow environment sharing the likes of wildland fires or ventilated compartment fires. The flame structure was probed using a digital camera. Small-scale wind-driven flames usually operate in a mixed-convection regime. Therefore, to decipher the competitive effect of buoyancy, momentum, and turbulence intensity, a non-dimensional parameter ${\xi }_x={\text{Gr}}_{x_1}/{\psi }_{x_2}^n$ was evaluated at multiple streamwise locations within the pyrolysis zone. To quantify the dependence of each flame parameter, first, a comparison between the flame standoff and ${\xi }_x$ was conducted, where a power-law trend was observed. Also, the convective heat transfer towards the fuel surface varied inversely with the flame standoff distance and ${\xi }_x$. Finally, the local mass burning rates were evaluated and plotted against the convective heat flux and ${\xi }_x$, where a positive linear scaling was observed for the former, and a negative power-law trend was shown by the latter. Based on the experimental measurements, a unified local mass burning rate correlation is proposed in the present work that performs exceptionally well for both laminar and turbulent boundary layer diffusion flames.

对风火进行了实验研究，以了解变化的流动条件对冷凝燃料表面局部燃烧行为的影响。这些火焰模仿了在强制流动的环境中发生的危险火势的动力变化，这些环境与野外火力或通风室的火力相似。使用数码相机探测火焰结构。小规模的风火焰通常以混合对流方式运行。因此，要解释浮力，动量和湍流强度的竞争效果，这是一个无量纲的参数${\xi }_X={\text{GR}}_{X_{\mathrm{1个}}}/{\psi }_{X_{\mathrm{2个}}}^{ñ}$在热解区内多个沿流的位置进行了评估。为了量化每个火焰参数的依赖性，首先，比较火焰距离和${\xi }_X$进行了观察到的幂律趋势。同样，对流向燃料表面的热传递与火焰的距离和火焰的距离成反比。${\xi }_X$。最后，评估了局部质量燃烧率，并将其与对流热通量和${\xi }_X$，其中前者呈线性正比例关系，而后者则呈负幂律趋势。基于实验测量，在当前工作中提出了统一的局部质量燃烧率相关性，该特性对于层流和湍流边界层扩散火焰均表现出色。