This favorable condition is caused by a larg er bottom protrusion volume and longer reentrant lip length with retard the fuel injection and lead a reduced emissions of NOx and particles.

• 喷油提前角和喷雾锥角决定着燃油在燃烧室内的落点高度，决定着柴油机各项性能指标的好坏，它们需与燃烧室形状优化匹配。