An experimental and numerical study on EGR simulants: Thermal and chemical kinetics on laminar flame speeds (PDF)
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- An experimental and numerical study on EGR simulants: Thermal and chemical kinetics on laminar flame speeds (PDF)
- 发表刊物：
- Fuel
- 摘要：
- Experiments and simulations were used to study the effects of diluents on laminar flame speeds of the stoichiometric, laminar, premixed dimethyl ether (DME)/air flames. Experiments were conducted in a constant volume bomb under initial temperature of 298K and initial pressure of 0.1MPa. Outwardly propagating spherical flames were used to measure the laminar flame speeds of mixtures with varying concentration of Ar, N2 or CO2 addition. Laminar flame speeds were also computed using the steady, one-dimensional laminar premixed flame code PREMIX with detailed chemical kinetics. Predictions showed a good agreement with experiments. For the three diluents studied in this work, laminar flame speed decreases with the increase of dilution ratio, while for a given dilution ratio, the significance of suppression effect on laminar flame speed is in the order of CO2, N2 and Ar. The suppression effects of N2 and Ar on flame propagation are mainly caused by reduced reactant concentration and modified heat capacity, both of which result in a decreased flame temperature. Besides that, CO2 further influences the chemical kinetics because it is a major product of combustion. Further experimental study on flame speed and simulation study on flame structure at fixed adiabatic flame temperature were conducted to verify the speculation and the possible reaction pathways which contribute to the chemical retarding effect by CO2 addition are recognized through sensitivity analysis.
- 合写作者：
- Chen ZY, Tang CL, Fu J, Jiang X, Huang ZH
- 卷号：
- 2012, 102: 567-573
- 页面范围：
- 567-573
- 是否译文：
- 否
- 发表时间：
- 2012-09-11