Structure of a stratified CH4 flame with H2 addition

Structure of a stratified CH4 flame with H2 addition
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添加 H2 的分层 CH4 火焰的结构

DOI:
10.1016/j.proci.2018.06.205
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发表时间:
2018
影响因子:
3.4
通讯作者:
Dreizler
Dreizler
中科院分区:
工程技术1区
文献类型:
--
作者:
Schneider;Magnotti;Barlow;Dreizler

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To explore the effect of H2addition (20 percent by volume) on stratified-premixed methane combustion in a turbulent flow, an experimental investigation on a new flame configuration of the Darmstadt stratified burner is conducted. Major species concentrations and temperature are measured with high spatial resolution by 1D Raman-Rayleigh scattering. A conditioning on local equivalence ratio (range fromϕ= 0.45 toϕ= 1.25) and local stratification is applied to the large dataset and allows to analyze the impact of H2addition on the flame structure. The local stratification level is determined asΔϕ/ΔT at the location of maximum CO mass fraction for each instantaneous flame realization. Due to the H2addition, preferential diffusion of H2is different than in pure methane flames. In addition to diffusing out of the reaction zone where it is formed, particularly in rich conditions, H2also diffuses from the cold reactant mixture into the flame front. For rich conditions (ϕ= 1.05 toϕ= 1.15) H2mass fractions are significantly elevated within the intermediate temperature range compared to fully-premixed laminar flame simulations. This elevation is attributed to preferential transport of H2into the rich flame front from adjacent even richer regions of the flow. Additionally, when the local stratification across the flame front is taken into account, it is revealed that the state-space relation of H2is not only a function of the local stoichiometry but also the local stratification level. In these flames H2is the only major species showing sensitivity of the state-space relation to an equivalence ratio gradient across the flame front.
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