Effects of the scalar dissipation rate on the steady laminar flamelet model

Effects of the scalar dissipation rate on the steady laminar flamelet model
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标量耗散率对稳定层流火焰模型的影响

DOI:
10.1088/0031-8949/2010/t142/014048
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发表时间:
2010-12
期刊:
影响因子:
2.9
通讯作者:
--
中科院分区:
物理与天体物理3区
文献类型:
--
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研究了在不同化学计量比下,标量耗散率(SDR)对稳态层流小火焰模型中Arrhenius速率一步可逆反应猝灭点的影响. SDR要么被假定为统一的,要么通过映射闭包方法建模。利用这两种模型,在混合分数空间求解了稳态火焰面方程,得到了完整的“S”型曲线。结果表明,SDR模型对“S”形曲线的轨迹有影响,淬火点有显著差异。对于χ=χst,在较低的χst处达到猝灭状态,但对于χ=χstexp[−2 erfc−1(2 z)2],在较高的χst处达到猝灭状态。而当火焰状态远离熄灭点时,“S”形曲线的差异较小。这一结果与反应物的混合状态有关;混合越差,“S形”曲线的差异就越显著。
The effects of the scalar dissipation rate (SDR) on the quenching points of the steady laminar flamelet model at different stoichiometric ratios of reactants are investigated for a one-step reversible reaction with the Arrhenius rate. SDRs are either presumed uniform or modeled by the mapping closure approach. With these two models, steady flamelet equations are solved in mixture-fraction space, and complete ‘S-shaped’ curves are obtained. The results show that the SDR models affect the locus of the ‘S-shaped’ curves and the quenching points are remarkably different. The quenching state is reached at a lower χst for χ=χst but at a higher χst for χ=χstexp[−2 erfc−1(2z)2]. However, when the flame state is far from the quenching point, the difference in ‘S-shaped’ curves is small. This result is associated with the mixed state of the reactants; the poorer the mixing, the more remarkable the difference in ‘S-shaped’ curves becomes.
DOI: 10.1103/physreve.70.036309
发表时间: 2004-09
期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子: --
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