CAJ | 학술논문

利用三维仿真软件AVLFire建立进气道喷射甲醇、缸内喷射柴油的模型，应用试验结果验证了模型的正确性。改变2200r／min，136N·m工况下的EGR率（0％，5％，15％，25％和35％），分析了EGR对甲醇‐柴油组合燃烧发动机燃烧过程和排放的影响。结果表明：与EGR率为0相比，随着EGR率增加，甲醇‐柴油组合燃烧发动机着火延迟期先缩短后延长，缸内最高压力降低，EGR率为5％时，着火延迟期缩短2°曲轴转角；随着EGR率增加，放热率曲线由双峰分布向单峰分布转变，最高温度下降，高温持续时间缩短；随着EGR率增加，NOx排放降低，CO和炭烟排放上升，与EGR率为0时比，EGR率为15％时的NOx排放量降低了54％。
이용삼유방진연건AVLFire건립진기도분사갑순、항내분사시유적모형，응용시험결과험증료모형적정학성。개변2200r／min，136N·m공황하적EGR솔（0％，5％，15％，25％화35％），분석료EGR대갑순‐시유조합연소발동궤연소과정화배방적영향。결과표명：여EGR솔위0상비，수착EGR솔증가，갑순‐시유조합연소발동궤착화연지기선축단후연장，항내최고압력강저，EGR솔위5％시，착화연지기축단2°곡축전각；수착EGR솔증가，방열솔곡선유쌍봉분포향단봉분포전변，최고온도하강，고온지속시간축단；수착EGR솔증가，NOx배방강저，CO화탄연배방상승，여EGR솔위0시비，EGR솔위15％시적NOx배방량강저료54％。
The model of intake port methanol injection and in‐cylinder diesel injection was built with AVL Fire software and was verified with test results .The effect of EGR on combustion and emission for methanol‐diesel engine was studied by chan‐ging the EGR rate of 0% ,15% ,25% and 35% respectively under the condition of 2 200 r/min and 136 N · m .The results showed that the ignition delay first shortened and then prolonged and the maximum in‐cylinder pressure decreased with the in‐crease of EGR rate .The ignition delay shortened by 2° when the EGR rate was 5% .The distribution curve of heat release rate changed to single peak from double peak and the duration of in‐cylinder high temperature shortened with the decline of maxi‐mum temperature when the EGR rate increased .With the increase of EGR rate ,the emission of NOx reduced and that of CO and soot increased .Compared with 0% EGR rate ,NOx emission of 15% EGR rate reduced by 54% .