用分析空气进入火焰区的速率与燃烧速率之间的关系来研究直喷式柴油机中扩散燃烧过程的机理,以火焰温度和气缸气体压力的测量值对空气进入率和燃烧率进行热力计算。为了用双色法确定火焰温度,藉在三个可见光波长上同时测量火焰亮度来估算柴油机火焰的辐射强度,建立了排气烟度与火焰区过量空气系数的联系。 The mechanism of diffusive combustion in direct injection diesel engine was studied by analyzing the relationship between the rate of air entering the flame zone and the combustion rate. The air entrainment rate and the combustion rate were calculated by the flame temperature and the measured value of cylinder gas pressure. In order to determine the flame temperature by the two-color method, the intensity of the flame of the diesel engine is estimated by measuring the brightness of the flame at three visible wavelengths simultaneously, and the relationship between the exhaust smoke and the excess air ratio in the flame zone is established.