基于光学分析的纳米泡状流柴油燃烧及碳烟生成历程研究

Based on the combustion visualization engine test platform,the effect of nanobubble concentration on the combustion process and soot generation process of nanoscale bubble flow diesel was studied.The image of engine combustion flame was obtained by high-speed photography technology,and the flame temperature field and KL factor field distribution were obtained by two-color analysis,and the development of combustion flame and soot generation process were analyzed by combining engine combustion characteristic parameters.The results show that with the increase of bubble concentration,the fuel combustion hysteresis period is shortened,the combustion duration period is shortened,the combustion center of gravity is advanced,which shows that the increase of nanobubble concentration is helpful to improve the ignition performance of fuel.Different concentrations of nanobubble diesel can reduce the combustion flame area,reduce the spatially integrated natural luminosity,reduce the average combustion temperature,reduce the flame combustion temperature gradient,reduce the KL factor,which shows that the addition of nanobubble has a positive effect on improving the flame temperature field distribution and inhibiting soot emissions.