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采用多组分混合物中扩散速度表达式并考虑Soret效应,在物理空间求解同时加入了多种稀释成分(CO_2,H_2O,N_2)的H_2/CO混合气与空气对撞燃烧形成的非预混火焰;考察了稀释成分加入与否以及稀释成分浓度的调整对于火焰结构以及相应熄火拉伸率产生的影响。结合数值计算中采用的化学反应机理,从稀释给H_2/CO混合气所带来的物理性质(分子扩散系数、Lewis数)和化学性质(燃烧特性、化学平衡、三体反应系数)的改变的角度分析了火焰结构和熄火拉伸率变化产生的原因。强调指出了火焰面燃烧模型的准确程度会受到是否考虑燃料稀释的直接影响。
Using the expression of diffusion velocity in multi-component mixture and considering the Soret effect, a non-premixed flame formed by the collision of H 2 / CO mixture with various dilution components (CO 2, H 2 O, N 2) The effects of adding dilution elements or not and adjusting the concentration of dilution elements on the flame structure and the corresponding stretch-off rate were investigated. Based on the chemical reaction mechanism used in the numerical calculation, the physical properties (molecular diffusion coefficient, Lewis number) and chemical properties (combustion characteristics, chemical equilibrium, and three-body reaction coefficients) From the perspective of flame structure and flameout rate of change causes. It is emphasized that the accuracy of the flame burn-in model will be directly affected by the consideration of fuel dilution.