【作者】

Kendra Shrestha,Ossi Kaario

【摘要】

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。 Diesel Engine has been the most powerful and relevant source of power in the automobile industries from decades due to their excellent performance, efficiency and power. On contrary, there are numerous environmental issues of the diesel engines hampering the environment for which it has been a great challenge for the researchers and scientists. In the recent years, numerous strategies have been introduced to eradicate the emission of the diesel engines.Among them, Partially Premixed Combustion (PPC) is one of the most emerging and reliable strategy. PPC is a compression ignited combustion process in which ignition delay is controlled to enhance better homogeneity of air-fuel mixture. PPC is intended to endow with better combustion with low soot and NO x emission. The paper presents the validation of the measurement data with the simulated cases followed by the study of the spray impingement and fuel vapor mixing in PPC mode for different injection timing.The study of the correlation of early injection with the fuel vapor distribution and wall impingement has been made in details. The engine is a single-cylinder engine EVE, installed in Aalto University Internal Combustion Engine Laboratory with the bore diameter of 200 mm. This implies the use of PPC strategy in large engine environment. The simulation is carried out with the commercial CDF code software STAR CD. Different injection parameters have been consider to lower the wall impingement and to produce better air-fuel mixing with the purpose good combustion and reduction of the emissions. The result of the penetration length of the spray and the fuel vapor distribution for different early injection cases have been illustrated in the study. Comparisons of different thermodynamic properties for different injection timing such as average density, average temperature, droplets evaporation percentage rate and liquid penetration length have been very clearly illustrated to get the insight of effect of early injection. The parameters like injection timing,injection period, injection pressure, inclusion angle of the spray have been taken as a major parameter that influence the combustion process in PPC mode. Extensive study has been made for each of these parameters to better understand their effects in the combustion process. Different split injection profiles have been implemented for the study of better fuel vapor distribution in the combustion chamber. The final part of the paper includes the study of the combustion and implementation of EGR to control the temperature so as to get more prolonged ignition delay to accompany the PPC strategy.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

2

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