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使用对冲火焰法实验测量和数值模拟多组合成气/空气的贫燃熄灭极限。随着主要可燃组分H_2和CO总含量的增加以及非可燃组分CO_2和N_2减少,在同一拉伸率下火焰浓度熄灭极限φ_(ex)(用当量比表示)降低,贫燃侧可燃极限φ_(limit)也随之降低。数值模拟结果与实验数据对比,在拉伸率较大时,两者符合得很好,在低拉伸率情况下,由于自然对流作用,导致测量偏差增大,使得实验测得的φ_(ex)高于数值模拟计算结果。
The hemorrhagic flame extinction limit of multi-combination gas / air was measured and experimentally measured by hedge-flame method. With the increase of the total content of H_2 and CO in the main flammable components and the decrease of the non-flammable components CO_2 and N_2, the flame extinction limit φ_ (ex) (expressed in terms of equivalent ratio) decreases at the same rate and the flammable limit φ_ (limit) also decreases. Compared with the experimental data, the results of numerical simulation are in good agreement with the experimental data. Under the condition of low elongation, the measurement deviation increases due to the natural convection, so that the experimentally measured φ_ (ex ) Is higher than the numerical simulation results.