CAJ | 학술논문

试验研究表明,在柴油机首着火循环前引入EGR可以改善柴油机首着火循环的冷起动性能。在试验研究的基础上,进行了化学动力学计算,进一步研究了EGR对起动燃烧的影响。计算发现着火循环前排气成分中的完全燃烧产物少,而未燃燃油和中间氧化产物的含量大,因此改善了燃烧。通过对不同EGR率和不同燃空当量比下,混合气在定容状态下的滞燃期进行分析,得到了混合气着火性能随着EGR率的变化规律。
시험연구표명,재시유궤수착화순배전인입EGR가이개선시유궤수착화순배적랭기동성능。재시험연구적기출상,진행료화학동역학계산,진일보연구료EGR대기동연소적영향。계산발현착화순배전배기성분중적완전연소산물소,이미연연유화중간양화산물적함량대,인차개선료연소。통과대불동EGR솔화불동연공당량비하,혼합기재정용상태하적체연기진행분석,득도료혼합기착화성능수착EGR솔적변화규률。
It has been investigated experimentally that introducing some amount of exhaust gas to the diesel engine before the first ignition cycle can help to improve the combustion performance. Based on ex perimental research, chemical kinetics simulation was taken to investigate the effect of EGR on the com bustion performance of cold starting periods. The simulation results show that before the ignition cycle, the complete combustion products in exhaust gas is little, the content of residual fuel and intermediate ox idation products is big, therefore improving the combustion. For constant volume combustion, ignition de lay of mixed gas under different EGR ratios and different fuel/air ratios was calculated and analyzed, and the changing rule of ignition characteristics of mixed gas relating to EGR rate was obtained.