森林火灾旋涡机理初探

作者在热风洞中模拟森林火灾发生的环境条件，在可燃物中设置一突出的圆柱形钝体，发现在有风燃烧火焰流向钝体下游时，紧贴不可燃的壁面，存在两个剧烈燃烧的驻涡，并且涡可以一定的频率脱落，从现象上看与冷流体流动中的卡门涡街有相似的地方，也有完全不同之处。高温燃烧气体新构成的涡的存在，易使下游可燃物点燃，从而加速火蔓延速度。

Experimental Study on Mechinism of Vortes

The authers simulated the environment of forest fires occurence in wind tunnel, placing a cylinderical obstacle onto combustible materials,finding that karmen Vortex street existingwhen burning ftame around the the cylinder moving downstream under wind blowing,comparewith the fluid moving process with no combustion reaction,partially they are similar,but therealso are many distinctions.The vortice leading in front of fire flame escape from and come down-stream to unburning field.they may ianite the forest combustible materials, make new sources ofignition, therefore,speed up the fire spread rate.