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首页> 外文期刊>JSME International Journal. Series B >Modeling Ignition and Combustion in Direct Injection Compression Ignition Engines Employing Very Early Injection Timing
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Modeling Ignition and Combustion in Direct Injection Compression Ignition Engines Employing Very Early Injection Timing

机译：采用非常早的喷射正时的直接喷射压缩式点火发动机的点火和燃烧建模

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摘要

An ignition and combustion model has been developed to predict the heat release rate in direct injection compression ignition engines employing very early injection timing. The model describes the chemical reactions, including low-temperature oxidation. The KIVA II computer code was modified with the present ignition and combustion model. The numerical results indicate that the model developed in this work reproduces major features of two-stage autoignition, as well as experimentally observed trends in NO_x and unburned fuel emissions. The computational results show that fuel injection timing significantly influences NO_x emissions. Results also indicate that fuel droplets that enter the squish region possibly become unburned fuel emissions. Some graphical results demonstrate the relationships among the in-cylinder fuel spray distributions, fuel-air equivalence ratio, temperature, and mass fractions of NO and unburned fuel.
机译：已经开发了一种点火和燃烧模型，以预测采用非常早的喷射正时的直喷压缩点火发动机的放热率。该模型描述了化学反应，包括低温氧化。使用当前的点火和燃烧模型修改了KIVA II计算机代码。数值结果表明，在这项工作中开发的模型重现了两阶段自燃的主要特征，以及实验观察到的NO_x和未燃烧燃料排放的趋势。计算结果表明，燃料喷射正时显着影响NO_x排放。结果还表明，进入挤压区域的油滴可能会变成未燃烧的燃料排放物。一些图形结果证明了缸内燃油喷雾分布，燃油-空气当量比，温度以及NO和未燃烧燃油的质量分数之间的关系。

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