Effects of oxygen enrichment on laminar burning velocities and Markstein lengths of CH4/O2/N2 flames at elevated pressures (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Effects of oxygen enrichment on laminar burning velocities and Markstein lengths of CH4/O2/N2 flames at elevated pressures (PDF)
- 发表刊物：
- Fuel
- 摘要：
- Laminar burning velocities and Markstein lengths of CH4/O2/N2 mixtures were measured in a constant volume combustion chamber over a wide range of O2 contents and equivalence ratios at elevated pressures. The laminar burning velocities were extracted using an accurate nonlinear methodology with properly chosen flame radii to reduce the systematic uncertainty. Chemical kinetic simulation was conducted using three different chemical reaction mechanisms with the PREMIX code. In general, numerical results agree well with the experimental data under most conditions. However, GRI Mech 3.0 and Aramco Mech 1.3 slightly under-predict the laminar burning velocities at high O2 content, and Han Mech overestimates the experimental data at low O2 content. With oxygen enrichment, the laminar burning velocity is dramatically enhanced by thermal effect, and diffusion effect makes a small positive contribution, while kinetic effect is negligible. Furthermore, Markstein length decreases with the oxygen enrichment ratio because of the combined effects of the density ratio and flame thickness. Moreover, for high O2 content mixtures, the flame becomes unstable mainly due to the effect of hydrodynamic instability.
- 合写作者：
- Wang JH, Cai X, Zhang WJ, Xie YL, Zhang M, Huang ZH
- 卷号：
- 2016, 184: 466-473
- 页面范围：
- 466-473
- 是否译文：
- 否
- 发表时间：
- 2016-09-15
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