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- W4285036463 abstract "NO$_{rm x}$ formation in lean premixed and highly-strained pure hydrogen-air flamelets is investigated numerically. Lean conditions are established at an equivalence ratio of 0.7. Detailed-chemistry, one-dimensional simulations are performed on a reactants-to-products counter-flow configuration with an applied strain rate ranging from $a=100 , {rm s}^{-1}$ to $a=10000 , {rm s}^{-1}$ and the texttt{GRI3.0} mechanism. Following a similar setup, two-dimensional direct numerical simulations are also conducted for representative strain rates of $2000 , {rm s}^{-1}$ and $5000 , {rm s}^{-1}$. Both solutions show a decreasing NO$_{rm x}$ trend as the applied strain rate is increased. This decreasing emission outcome is highlighted for the first time in this study for lean pure-hydrogen flamelets. A deep analysis of the 2D solution underlines that there is no production of NO$_{rm x}$ in the second dimension, thus proving that the emission trend is not a result of a setup preconditioning, but is instead a direct physical effect of stretch on the flame. Furthermore, a detailed analysis of the NO$_{rm x}$ formation pathways at $a=2000 , {rm s}^{-1}$ and $a=5000 , {rm s}^{-1}$ is performed. Thermal NO$_{rm x}$ and NNH pathways are shown to both contribute significantly to the total NO$_{rm x}$ production. While the NNH route contribution is roughly constant at different strain rates, a significant decrease is observed along the thermal NO$_{rm x}$ route. Overall, results show that lean and highly-strained hydrogen flames experience a significant decrease of NO$_{rm x}$. This property is discussed and analysed in the paper." @default.
- W4285036463 created "2022-07-12" @default.
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- W4285036463 date "2022-07-08" @default.
- W4285036463 modified "2023-10-18" @default.
- W4285036463 title "NOx emissions trends in hydrogen lean premixed flamelets at high strain rate" @default.
- W4285036463 doi "https://doi.org/10.48550/arxiv.2207.03913" @default.
- W4285036463 hasPublicationYear "2022" @default.
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