Abstract This work numerically examines the quasi-steady spray combustion and soot development for soybean methyl ester (SME) and SME-ethanol blends (S90E10, S70E30). A validated reduced ethanol mechanism (37 species and 149 reactions) was formulated using a temperature sensitivity analysis under auto-ignition and jet-stirred reactor conditions. At initial pressures between 10.0 bar and 60.0 bar, initial temperatures between 750 K and 1350 K and equivalence ratios between 0.5 and 2.0, the ignition delays and key species profiles (C2H5OH, CO2, O2) of the reduced mechanism deviated by 0.5 order and 40%, respectively as compared to the experimental measurements. Subsequently, the reduced ethanol mechanism was combined with a reduced biodiesel mechanism to form a surrogate mechanism (102 species and 446 reactions) for biodiesel-ethanol blends and integrated into OpenFOAM for spray combustion modelling. Under reacting spray conditions at a constant ambient density of 22.8 kg/m3 and ambient temperatures of 900 K and 1000 K, the spray penetrations for SME-ethanol blends were shortened by 35.5% (maximum difference). Smaller flame areas with 60 K higher local flame temperature were obtained. Due to a 20% decrease in acetylene mass fractions and soot formation rates, the peak soot volume fractions for SME-ethanol blends were 19.6% lower.

中文翻译：

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使用CFD-reduced化学动力学方法对大豆甲酯及其与乙醇共混物的准稳态喷雾和烟尘特性进行数值研究

摘要 这项工作对大豆甲酯 (SME) 和 SME-乙醇混合物 (S90E10, S70E30) 的准稳态喷雾燃烧和烟尘形成进行了数值研究。在自燃和喷射搅拌反应器条件下，使用温度敏感性分析制定了经过验证的还原乙醇机制（37 种物质和 149 种反应）。在 10.0 bar 和 60.0 bar 之间的初始压力、750 K 和 1350 K 之间的初始温度以及 0.5 和 2.0 之间的当量比下，还原机制的点火延迟和关键物质分布（C2H5OH、CO2、O2）偏离了 0.5 级和 40 %，分别与实验测量值相比。随后，还原乙醇机制与还原生物柴油机制相结合，形成生物柴油-乙醇混合物的替代机制（102 种和 446 种反应），并集成到 OpenFOAM 中进行喷雾燃烧建模。在恒定环境密度 22.8 kg/m3 和环境温度 900 K 和 1000 K 的反应喷雾条件下，SME-乙醇混合物的喷雾穿透缩短了 35.5%（最大差异）。获得了具有 60 K 较高局部火焰温度的较小火焰区域。由于乙炔质量分数和烟灰形成率降低了 20%，SME-乙醇混合物的峰值烟灰体积分数降低了 19.6%。SME-乙醇混合物的喷雾穿透缩短了 35.5%（最大差异）。获得了具有 60 K 较高局部火焰温度的较小火焰区域。由于乙炔质量分数和烟灰形成率降低了 20%，SME-乙醇混合物的峰值烟灰体积分数降低了 19.6%。SME-乙醇混合物的喷雾穿透缩短了 35.5%（最大差异）。获得了具有 60 K 较高局部火焰温度的较小火焰区域。由于乙炔质量分数和烟灰形成率降低了 20%，SME-乙醇混合物的峰值烟灰体积分数降低了 19.6%。