多参数对柴油机缸内局部瞬态火焰温度及碳粒浓度的影响

Influence of Multi-Parameters on Local Instantaneous Flame Temperature and Soot Concentration in Cylinder of Diesel Engines

采用了一种新的基于微粒衍射理论的改进双色法来研究柴油机缸内局部瞬态火焰温度和碳粒浓度 ,并在缸盖火力面上布置了 2个有代表性的测点 :一个测点位置在缸盖鼻梁区 ,面对活塞凹坑 ;另一个测点位置面对活塞顶。在 2个测点同时测得的缸内局部碳粒浓度和火焰温度 ,数值上有很大的差异 ,且均有一定相位差 ,其相位差约为 10°CA左右。面对活塞顶位置 ,火焰温度和碳粒浓度有较大的循环变动。分析了包括负荷、转速、进气温度、冷却水温度在内的多种参数对缸内局部瞬态碳粒浓度、火焰温度的影响。

In the present study a new improved two-color method based on particulate diffraction theory was used to investigate the local instantaneous flame temperature and soot concentration in cylinder of diesel engiens.Two representative measurement locations were arranged in the cylinder head which face the crown and the bowl of the piston separately.A significant difference of magnitude both in soot concentration and flame temperature was found between the two measurement locations,and the time difference of appearance was about 10° CA.There was a large cycle variation at the measurement location facing the crown.The influence of multi-parameters including load,speed,intake air temperature and cooling water temperature on local instantaneous flame temperature and soot concentration in cylinder of diesel engines was discussed analytically.