This work has conducted a numerical study using AVL‐Boost engine simulation utilizing biogas (CH₄ and CO₂)–air mixtures in a SI engine model. The effect of varying the air manifold temperature from 25 to 50°C on the combustion characteristics as well as engine performance under full load condition in a SI engine fueled by gasoline and biogas mixtures has been investigated. The performed tests involved using variable concentrations of CO₂ from 10% to 40% by volume. The current model has been validated with experimental results and it was found that the error in predicting the P‐θ behavior of the engine is about 4.89%. The results showed that, as the air inlet temperature increases, the volumetric efficiency decreases and the brake specific fuel consumption (BSFC) increases for gasoline and all biogas compositions. However, the peak pressure, brake output power, maximum pressure rise rate, and maximum heat release rate were decreased slightly with the increase in air inlet temperature. The effect was only observed for gasoline and the 10%‐CO₂ biogas, whereas the effect on the maximum heat release rate was detected on gasoline and biogas compositions up to 20%‐CO₂ only. On the other hand, the existence and growth of CO₂ content in the biogas reduced significantly the peak pressure, brake output power, maximum pressure rise rate, volumetric efficiency, and both net and maximum heat release rates, though its effect in reducing the volumetric efficiency stopped at 20%‐CO₂ biogas. Furthermore, BSFC rises noticeably with the increase in CO₂ ratio in biogas. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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研究进气温度对以沼气为燃料的火花点火式发动机的燃烧特性的影响

这项工作已使用AVL-Boost发动机模拟进行了数值研究，该模拟利用SI发动机模型中的沼气（CH ₄和CO ₂）-空气混合物。已经研究了在由汽油和沼气混合物供油的SI发动机中，将空气歧管温度从25更改为50°C对全负荷条件下的燃烧特性和发动机性能的影响。进行的测试涉及使用可变浓度的CO ₂占体积的10％至40％。目前的模型已经通过实验结果验证，发现预测发动机P-θ行为的误差约为4.89％。结果表明，随着进气温度的升高，汽油和所有沼气成分的容积效率降低，制动比燃料消耗（BSFC）升高。但是，随着进气温度的升高，峰值压力，制动器输出功率，最大压力上升率和最大放热率都略有下降。仅在汽油和10％-CO ₂沼气中观察到了这种影响，而对最大放热率的影响仅在不超过20％-CO _2的汽油和沼气中检测到。另一方面，一氧化碳的存在和增长沼气中的₂含量显着降低了峰值压力，制动输出功率，最大压力升高率，容积效率以及净和最大热量释放率，尽管其降低容积效率的作用在20％-CO ₂沼气中停止了。此外，随着沼气中CO ₂比的增加，BSFC显着增加。©2020年化学工业协会和John Wiley＆Sons，Ltd.