逆风和静止环境中火焰沿柱状燃料传播的实验研究

The Experimental Study on Flame Spreading over a Rod Fuel in an Opposed Air Flow and a Quiescent Environment

本文测量了不同直径的ＰＭＭＡ燃料棒在逆风和静止环境中的火焰传播速度、裂解长度和火焰形状。实验结果表明：在相同的燃料直径下，逆流风速越大，火焰传播速度越小，裂解区长度越小，火焰形状越平；在相同的逆流风速下。（１）当逆流风速小于０．７ｍ／ｓ时，燃料直径越大，火焰传播速度越小，（２）当逆流风速大于０．７ｍ／ｓ时，燃料直径越大，火焰传播速度越大。当逆流风速较大时，不同直径燃料的无因次裂解长度趋向一致。

In this paper the flame spreading rate (Vf), pyrolysis length (lp)and flame structure of PMMA fuel rod in an opposed air flow and quiescent environment were investigated. The experiments were done with different diameter (d0) of fuel rod in different opposed air velocity(u∞). According to the expermental results, it is shown that Vf and lp are decreased with the increase of u∞ when d0 keeps constant. It can also be seen that Vf is decreased with the increase of d0 when u∞ is less than 0.7m/s. However, Vf is increased with the increase of d0 when u∞ is greater than 0.7m/s. It is also concluded that the dimensionless pyrolysis lengths tend to be same for different d0 when u∞ reaches a critical value.