Enhancement of wind by bushfire, referred to as bushfire-wind enhancement phenomenon, causes damages to buildings located in bushfire-prone areas by increasing pressure load around the structures. This study focuses on the effects of point source aspect ratio (AR) on the wind enhanced by fire. FireFOAM solver of OpenFOAM platform is used to perform Large Eddy Simulation analysis for different fire source aspect ratios under two different fire source conditions: (i) identical fire intensity (fire heat release rate per unit area) and (ii) identical fire heat release rate conditions. Simulations were performed for three different fire source aspect ratios under these fire source boundary conditions. An appropriate normalization group based on fire source hydraulic diameter was introduced for fire-induced pressure gradient to explain the variation of wind enhancement with fire source aspect ratio. The results reveal that under a constant fire intensity condition, increasing the fire source aspect ratio causes a higher normalized fire-induced pressure gradient which leads to more intensified wind enhancement. In contrast, the increase of fire source aspect ratio while fire heat release rate is kept constant culminates in a reduction in the normalized fire-induced pressure gradient, reducing wind enhancement. Moreover, with the increase of the fire source aspect ratio, the area of counter-rotating vortices (CRV) where maximum wind enhancement occurs is expanded. The results also show that with the increase of fire source aspect ratio, the length of flame attachment to the ground immediately downstream of fire increases. In addition to the longitudinal wind enhancement, the effects of fire source aspect ratio on vertical velocity were also analyzed based on the Richardson number defined by hydraulic diameter and flow reference velocity. The effects of the aspect ratio on flame length were also studied. It was shown as a result of the increase of aspect ratio for one unit, flame length increases by approximately 14% and reduces by 7% under constant fire intensity and constant fire heat release rate condition, respectively.

丛林大火对风的增强，称为丛林大风增强现象，通过增加建筑物周围的压力负荷，对位于丛林大火易发区域的建筑物造成破坏。这项研究集中在点源长宽比（AR）对火增强的风的影响上。OpenFOAM平台的FireFOAM求解器用于在两种不同火源条件下对不同火源纵横比执行大涡模拟分析：（i）相同的火强度（每单位面积的火热释放率）和（ii）相同的火热释放率使适应。在这些火源边界条件下，对三种不同的火源长宽比进行了仿真。针对火源压力梯度引入了基于火源水力直径的适当归一化组，以解释增强风随火源长宽比的变化。结果表明，在恒定的火势条件下，增加火源长宽比会导致更高的归一化火诱发压力梯度，从而导致更大程度的增强风量。相反，在使火热释放速率保持恒定的情况下，增加火源的纵横比最终导致归一化火诱发的压力梯度减小，从而降低了风量。而且，随着火源纵横比的增加，发生最大风增强的反向旋转涡流（CRV）的面积扩大。结果还表明，随着火源长宽比的增加，紧接火焰下游的火焰附着在地面上的长度增加。除纵向风增强外，还根据由水力直径和流参考速度定义的理查森数，分析了火源长宽比对垂直速度的影响。还研究了纵横比对火焰长度的影响。结果表明，由于单位长宽比的增加，在恒定的火强度和恒定的火热释放率条件下，火焰长度分别增加了约14％和减少了7％。基于水力直径和水流参考速度定义的理查森数，还分析了火源长宽比对垂直速度的影响。还研究了纵横比对火焰长度的影响。结果表明，由于单位长宽比的增加，在恒定的火强度和恒定的火热释放率条件下，火焰长度分别增加了约14％和减少了7％。基于水力直径和水流参考速度定义的理查森数，还分析了火源长宽比对垂直速度的影响。还研究了纵横比对火焰长度的影响。结果表明，由于单位长宽比的增加，在恒定的火强度和恒定的火热释放率条件下，火焰长度分别增加了约14％和减少了7％。