An experimental study of the sooting behavior of a partially premixed flame under moderately rich conditions
An experimental study of the sooting behavior of a partially premixed flame under moderately rich conditions
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DOI：
10.1016/j.combustflame.2022.112429
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发表时间：
2023-06
影响因子：
4.4
通讯作者：
Kevin Gleason;A. Gomez
中科院分区：
文献类型：
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作者：
Kevin Gleason;A. Gomez
碳烟及其气态前体的详细量化（前体高达166 amu，体积分数，颗粒尺寸，数浓度，和光发射率分散指数）在层流部分预混逆流火焰的乙烯。所研究的火焰具有当量比Φ = 2.43和混合物分数Zst = 0.4，导致由富预混火焰分量和扩散火焰分量组成的明显的双火焰结构，两者都稳定在滞止平面的燃料侧。当量比的值使得预混火焰成为烟灰产生的主要贡献者，其中烟灰被来自扩散火焰组分的OH完全氧化。测量颗粒尺寸以准单调增加，但在整个烟灰形成区域中保持在几纳米内。芳香族物质主要在预混火焰的后火焰区域中形成。它们的摩尔分数在预混火焰附近达到峰值，并随着接近扩散火焰而降低。实验测得的气体物种被捕获动力学模型，除了两个关键物种在烟尘化学：苯和萘。
Soot and its gaseous precursors are quantified in detail (precursors up to 166 amu, volume fraction, particle size, number concentration, and light emissivity dispersion exponent) in a laminar partially premixed counterflow flame of ethylene. The investigated flame has an equivalence ratio Φ = 2.43 and a mixture fraction Zst= 0.4, resulting in a distinct double-flame structure consisting of a rich premixed flame component and a diffusion flame component, both stabilized on the fuel side of the stagnation plane. The value of the equivalence ratio makes the premixed flame the dominant contributor to soot production, with soot being oxidized completely by OH from the diffusion flame component. Particle size is measured to increase quasi-monotonically, but remains within a few nanometers throughout the soot forming region. Aromatic species are primarily formed in the post flame region of the premixed flame. Their mole fractions peak close to the premixed flame and decrease as the diffusion flame is approached. The experimentally measured gaseous species are captured well by kinetic models, with the exception of two critical species in soot chemistry: benzene and naphthalene.