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首页> 外文期刊>International journal of green energy >A numerical study on the effects of EGR and spark timing to combustion characteristics and NOx emission of a GDI engine
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A numerical study on the effects of EGR and spark timing to combustion characteristics and NOx emission of a GDI engine

机译：EGR和火花正时对GDI发动机燃烧特性和NOx排放影响的数值研究

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摘要

EGR is one of the most significant strategies for reducing especially nitrogen oxides (NOx) emissions from internal combustion engines. The thermal efficiency of spark ignition engines is lower than compression ignition engines because of its lower compression ratio. If the compression ratio is increased to obtain higher thermal efficiency, there may be a knocking tendency in spark ignition engines. EGR can be used in order to reduce NOx emissions and avoid knocking phenomena at higher compression ratios. In-cylinder temperature at the end of combustion is decreased and heat capacity of fresh charge is increased when EGR applied. Besides EGR, spark timing is another significant parameter for reducing exhaust emissions such as nitrogen oxides, and unburned hydrocarbon (UHC). In this study the effects of EGR and spark timing on spark ignition engine were investigated numerically. KIVA codes were used in order to model combustion process. The combustion process has been modeled for a single cylinder, four stroke and gasoline direct injection (GDI) spark ignition engine. The results showed that in-cylinder pressure and heat release rate decrease as EGR ratio increase. In-cylinder pressure increases with the advancing of spark timing. Advancing spark timing increases the heat release rate and in-cylinder temperature. The simulation results also showed that EGR reduced exhaust gas temperature and NOx emissions.
机译：EGR是减少内燃机尤其是氮氧化物（NOx）排放的最重要策略之一。火花点火发动机的热效率由于其较低的压缩比而低于压缩点火发动机。如果增加压缩比以获得更高的热效率，则火花点火发动机中可能存在爆震趋势。可以使用EGR以减少NOx排放并避免较高压缩比下的爆震现象。当使用EGR时，燃烧结束时的缸内温度降低，新鲜进料的热容量增加。除EGR外，火花正时是减少废气排放的另一个重要参数，例如氮氧化物和未燃烧的碳氢化合物（UHC）。在这项研究中，数值研究了EGR和火花正时对火花点火发动机的影响。 KIVA代码用于模拟燃烧过程。已针对单缸，四冲程和汽油直喷（GDI）火花点火发动机对燃烧过程进行了建模。结果表明，缸内压力和放热率随着EGR率的增加而降低。缸内压力随着火花正时的提前而增加。提前点火正时会增加放热速率和缸内温度。模拟结果还表明，EGR降低了废气温度和NOx排放。

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