柴油喷雾贯穿距影响因素灰色关联分析

摘要

由于燃油的喷射、雾化、蒸发以及与空气的混合等过程对发动机的燃烧和排放特性有重要影响，以柴油喷雾的主要特征尺寸喷雾贯穿距为研究对象，采用纹影法成像技术，研究了不同喷油脉宽、喷油压力和环境背压下定容弹中柴油的喷雾形态，得到不同工况下的柴油喷雾贯穿距，然后应用灰色关联理论分析这3个因素对喷雾贯穿距影响程度。结果表明：在相同喷油压力和脉宽下，喷雾贯穿距随背压的增大而减小；在相同背压和喷油脉宽下，喷雾贯穿距随喷油压力的增大而增大；喷油压力对喷雾贯穿距的影响最大，背压次之，喷油脉宽影响最小。%Due to the important effects of fuel injection,atomization,evaporation and mixing process with air on combustion and emission characteristics of engine,the main feature size of penetration length of diesel spray was taken as research object.The effects of injection pulse width,injection pressure and back pressure in constant volume bomb on diesel spray were experimentally investigated by schlieren imaging technology.The impact of three factors on spray penetration length was also analyzed by gray relation theory.The results show that the spray penetration length is decreased with the increasing of back pressure under the same injection pressure and pulse width,while it is increased with the increasing of injection pressure under the same back pressure and injection pulse width.The injection pressure has the greatest impact on spray penetration length with less effects of back pressure and injection pulse width.