Influence of multiple pre-injection on engine performance based on exhaust gas control

Enxing Zhang,Tengteng Li,Zhengran Yu,Zenghui Yin,Guotian Li,Jing Hao,F Yan,M Li,X Hou,Y Long

doi:10.1051/e3sconf/202126801011

Enxing Zhang, Tengteng Li + Show 8 more

Open Access

https://doi.org/10.1051/e3sconf/202126801011

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Abstract

With the development of the society, the emission laws are increasingly strict, and EGR and multiple pre-injection strategy can effectively reduce emissions. In order to study the influence of EGR rate and pre-injection on the emission and performance of engine, a computational fluid dynamics (CFD) simulation model was established based on GT power. By changing the EGR rate, the number of pre-injection and the amount of pre-injection, the best technology coupling point is explored. The results show that EGR can effectively reduce the generation of NOx, but it will lead to the increase of soot production and the decrease of power; pre-injection can improve the trade-off relationship between NOx and power.

Highlights

Because of the high efficiency and fuel economy of diesel engine, it has been used as power source by vehicle and non-road machinery
The results show that with the increase of EGR rate, NOx emissions will decrease, while CO and soot will decrease
When EGR is 10%, the initial value of NOx is 17.92g/(kWh), and the MAP map shows a 12.44% reduction in NOx emissions

Summary

Introduction

Because of the high efficiency and fuel economy of diesel engine, it has been used as power source by vehicle and non-road machinery. EGR can reduce NOx by changing the gas composition in the cylinder[3]As the EGR rate increases, the oxygen concentration in the cylinder decreases, while the concentration of carbon dioxide and water vapor increases. The model controls the EGR rate by introducing the exhaust gas into the intake manifold after the intake air cooler. The combustion deterioration in the cylinder is not serious, and the temperature change is small, resulting in a slower reduction in NOx and soot emissions. As the EGR rate increases, the carbon dioxide and water vapor with higher specific heat capacity in the cylinder will increase. Some oxygen molecules in the fresh air are replaced by carbon dioxide molecules and water vapor, thereby reducing the local combustion rate and temperature. The increased carbon dioxide and water vapor directly affect combustion and inhibit NOx formation

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Findings

Summary and outlook