Comparative behavior of gasoline–diesel/butanol–diesel blends and injection strategy management on performance and emissions of a light duty diesel engine
Comparative behavior of gasoline–diesel/butanol–diesel blends and injection strategy management on performance and emissions of a light duty diesel engine
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DOI：
10.1016/j.energy.2014.04.065
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发表时间：
2014-07
期刊：
影响因子：
9
通讯作者：
Stefano Iannuzzi;G. Valentino
中科院分区：
文献类型：
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作者：
Stefano Iannuzzi;G. Valentino
来自可再生资源的生物柴油或含氧燃料对发动机技术提出了挑战，以设计相关系统来保持高效率和低环境影响。在一台欧5轻型柴油机上，研究了汽油-柴油、丁醇-柴油和商用柴油混合燃料对燃烧和排放的影响。发动机试验在2500 rpm和0.8 MPa制动平均有效压力下进行。结果表明，汽油和丁醇混合燃料具有较长的着火延迟期和较好的挥发性，在单次喷射策略下，汽油和丁醇混合燃料具有较好的预混燃烧特性，有利于改善空燃混合，降低烟度和氮氧化物排放。对于丁醇-柴油混合物，丁醇分子中O2的存在也加强了对碳烟的有利影响，这对减少局部富油区以及碳烟的形成和氧化起着积极的作用。丁醇-柴油混合燃料的UHC（未燃碳氢化合物）排放低于柴油和汽油-柴油混合燃料，因为氧气在氧化过程中发挥了积极作用。
Biodiesel or oxygenated fuel from renewable sources set a challenge to the engine technology to design relevant systems for keeping high efficiency and low environmental impact. The objective of this paper was to investigate the influence on combustion and emissions in a Euro 5 light duty diesel engine fueled with gasoline–diesel, butanol–diesel and commercial diesel fuels. Engine tests were carried out 2500 rpm and 0.8 MPa of brake mean effective pressure. The investigation was focused on the management of injection strategy for different combustion phasing under two oxygen concentrations at intake.The main results showed that the longer ignition delay and better volatility provided by the gasoline and butanol blends activated a premixed combustion mechanism for the single injection strategy, which helped to enhance the air/fuel mixing with benefits on smoke and NOx (nitrogen oxides) emissions. For the butanol-diesel blend, favorable effects on soot were also strengthened by the presence of O2within the butanol molecule that plays a positive role on the reduction of local rich fuel regions and on soot formation and oxidation. The butanol–diesel blend gave lower UHC (unburned hydrocarbons) emissions than the diesel and gasoline–diesel blend because of the positive role played by the oxygen on the oxidation process.