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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。
This paper measured the flame propagation velocity, crack length and flame shape of PMMA fuel rods with different diameters in upwind and static environments. The experimental results show that under the same fuel diameter, the larger the counter-flow velocity, the smaller the propagation velocity of the flame, the smaller the length of the cracking zone and the flatter the flame shape. (1) When the counter-current velocity is less than 0.7m / s, the larger the diameter of the fuel, the smaller the propagation velocity of the flame. (2) The larger the diameter of the fuel when the velocity of the counter-current wind is greater than 0.7m / s, the greater the flame propagation velocity. When the counter-current wind speed is large, the dimensionless cracking length of fuel with different diameters tends to be consistent.