摘要
采用复配乳化剂OP4/Span80、正丁醇和生物柴油作为助溶剂配制出3种乙醇掺混含量相同的乙醇柴油(R5E10、N5E10和B10E10),并在柴油机上对比分析了柴油与乙醇柴油的发动机性能和燃烧排放特性。试验结果表明,发动机燃用乙醇柴油的当量油耗率要比燃用纯柴油低,其中B10E10和N5E10最低。燃用乙醇柴油后燃烧始点推迟,最大爆发压力、最大压力升高率以及放热峰值升高,但其对应的曲轴转角滞后,其中N5E10的放热峰值和最大压力升高率最高,B10E10次之,而全负荷时R5E10的最大缸内压力最高。与柴油相比,乙醇柴油可同时改善 NOx和烟度排放,但其 HC和CO排放在小负荷时增加。综合来看,生物柴油是制备乙醇柴油的最佳助溶剂,对改善柴油机燃烧和优化污染物排放具有重要作用。
Emulsifier mixture OP4/Span80, n-butanol and biodiesel were utilized as co-solvent to prepare three kinds of ethanol-diesel with the same mixing proportion of ethanol （R5E10, N5E10 and BIOE10）. The experiments were conducted to comparatively analyze the perfbrmance, combustion and emission characteristics of a diesel engine fuelled with diesel and ethanol-diesel. The results showed that the brake specific fuel consumption of diesel engine fuelled with ethanol-diesel was lower than that with diesel, and B10E10 and NYE10 had the lowest brake specific fhel consumption. The combustion timing was postponed, and the maximum cylinder pressure, the maximum pressure rise rate and peak heat release rate increased when fhelled with ethanol-diesel, while the corresponding crank angle delayed. The maximum pressure rise rate and peak heat release rate were highest when fuelled with N5E10, tire second highest was with B10E10, while tire maximum cylinder pressure had the highest value at full load when fuelled with RYE 10. As compared to diesel, ethanol-biodiesel could significantly improve NOx and smoke emissions, except for the higher HC and CO emissions under low and moderate loads. On the whole, biodiesel is an optimum co-solvent tbr preparation of ethanol-diesel, which has important impact on improving combustion and optimizing pollutant emissions.
出处
《汽车工程学报》
2012年第5期327-333,共7页
Chinese Journal of Automotive Engineering
基金
国家自然科学基金项目(50976051)
江苏省高校自然科学基金项目(10KJB470004)
江苏大学高级人才基金(11JDG131)
江苏省汽车工程重点实验室开放基金(QC201102)
江苏高校优势学科建设工程资助项目(2011年)
关键词
乙醇柴油
助溶剂
燃烧与排放
柴油机
ethanol-diesel
co-solven
combustion and emissions
diesel engine
