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首页> 外文会议>International Symposium on Combustion; 20060805-11; University of Heidelberg(DE) >Measurement and modeling of the sooting propensity of binary fuel mixtures
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Measurement and modeling of the sooting propensity of binary fuel mixtures

机译：二元燃料混合物烟灰倾向的测量和建模

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The sooting behaviour of binary fuel mixtures was evaluated both experimentally and through computer simulations. The soot volume fraction in laminar diffusion flames of mixtures of ethylene/propane, methane/ethylene, methane/propane, methane/ethane, methane/butane, ethane/propane and ethane/eth-ylene fuels was measured using 2-dimensional line of sight attenuation. A synergistic effect was observed for the ethylene/propane, methane/ethylene, methane/ethane and ethane/ethylene mixtures. The synergistic effect translated into a higher soot concentration for a mixture fraction than could be yielded by the added contribution of both pure fuels. Such an effect was not observed for the methane/propane, methane/butane and ethane/propane mixtures. Through experiments in which the flame temperature was kept constant, it was determined that the synergistic effect in the methane/ethylene mixture is very temperature dependent whereas, that in the ethylene/propane mixture is not. This phenomenon was further studied through the modeling of the ethylene/propane mixture. Numerical simulations were carried out using two different soot models. The simulations confirmed the presence of a synergistic effect. It was found that the effect could be directly correlated to a synergistic effect in the concentration of n-C_4H_5 and n-C_4H_3, which could be traced back to an interaction between ethylene and methyl radical species. These results yield further insight into the pathways to soot formation and highlight the importance of further analyzing binary fuel mixtures as a means of understanding soot formation in practical devices using industrial fuels.
机译：通过实验和通过计算机模拟评估了二元燃料混合物的烟so行为。使用二维视线测量乙烯/丙烷，甲烷/乙烯，甲烷/丙烷，甲烷/乙烷，甲烷/丁烷，乙烷/丙烷和乙烷/乙烯燃料的层流扩散火焰中的烟灰体积分数衰减。对于乙烯/丙烷，甲烷/乙烯，甲烷/乙烷和乙烷/乙烯混合物，观察到协同作用。协同效应转化为比两种纯燃料的添加贡献所能产生的更高的混合分数烟灰浓度。对于甲烷/丙烷，甲烷/丁烷和乙烷/丙烷混合物，未观察到这种效果。通过使火焰温度保持恒定的实验，确定了甲烷/乙烯混合物中的协同效应与温度密切相关，而乙烯/丙烷混合物中的协同效应与温度无关。通过对乙烯/丙烷混合物进行建模，可以进一步研究这种现象。使用两个不同的烟灰模型进行了数值模拟。模拟证实了协同作用的存在。发现该作用可以与浓度n-C_4H_5和n-C_4H_3的协同作用直接相关，这可以追溯到乙烯和甲基自由基之间的相互作用。这些结果使人们进一步了解了形成烟灰的途径，并强调了进一步分析二元燃料混合物作为理解使用工业燃料的实际设备中烟灰形成的手段的重要性。

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