摘要
为对比柴油机掺混不同的含氧燃料时,不同碳氧键燃料对燃烧及排放特性的差异性影响,以柴油(Diesel)、聚甲氧基二甲醚(PODE)/柴油、碳酸二甲酯(DMC)/柴油为对象,在高压共轨柴油机上,考察其在不同预喷比例及废气再循环(EGR)率下的燃烧及排放特性规律。结果表明:碳氧单键含氧燃料降低碳烟能力比碳氧双键含氧燃料更强,随着EGR率增加,PODE/Diesel的放热率峰值变化幅度更大,NOX排放大幅下降,EGR率为20%时,PODE/Diesel与DMC/Diesel的烟度分别下降78.10%、40.93%;随着预喷比例增加,DMC/Diesel放热率峰值变化幅度更大,NOX排放有所下降,预喷比例为20%时,PODE/Diesel与DMC/Diesel的烟度下降64.27%、43.40%;3种燃料中,碳氧单键混合燃料的核态颗粒物数量浓度峰值最高,但颗粒物几何平均粒径最低。
In order to compare the differential effects of different carbon-oxygen bond fuels on combustion and emission characteristics when diesel engines are mixed with different oxygen-containing fuels,diesel,polymethoxy dimethyl ether(PODE)/Diesel,and dimethyl carbonate(DMC)/Diesel were employed to investigate the combustion and emission characteristics of high-pressure common rail diesel engines under various pre-injection ratios and exhaust gas recirculation(EGR)rates.The results demonstrated that carbon-oxygen single bond oxygen-containing fuel had a stronger ability to reduce carbon smoke than carbon-oxygen double bond oxygen-containing fuel.With an increase in the EGR rate,the peak change in the heat release rate of PODE/Diesel was greater,leading to a significant reduction in NOX emissions.At an EGR rate of 20%,the smoke levels of PODE/Diesel and DMC/Diesel decreased by 78.10%and 40.93%,respectively.Similarly,as the pre-spray ratio increased,the peak change in heat release rate of DMC/Diesel was greater,and NOX emissions decreased.At a pre-spray ratio of 20%,the smoke levels of PODE/Diesel and DMC/Diesel decreased by 64.27%and 43.40%,respectively.Among the three fuels,the peak concentration of nuclear particulate matter in the carbon-oxygen single bond hybrid fuel was the highest,but the geometric average particle size of the particulate matter was the lowest.
作者
周斌
尹川
蒋状
曾东建
韩伟强
蒲俊州
Zhou Bin;Yin Chuan;Jiang Zhuang;Zeng Dongjian;Han Weiqiang;Pu Junzhou(School of Mechanical and Electrical Engineering,Xichang University,Xichang,615000,China;ChinaAutomotive Engineering Research Institute Co.,Ltd.,Chongqing,401122,China;College of IntelligentManufacturing and Automotive,Neijiang Vocational and Technical College,Neijiang,641000,China;Key Laboratory of Fluid and Power Machinery,Ministry of Education,Xihua University,Chengdu,610039,China)
出处
《中国农机化学报》
北大核心
2025年第2期153-159,172,共8页
Journal of Chinese Agricultural Mechanization
基金
国家自然科学基金(52006282)。
关键词
含氧燃料
废气再循环
预喷策略
柴油机
oxygenated fuel
exhaust gas recirculation
pilot injection strategy
diesel engines
