汽油和乙醇预混对柴油机燃烧与排放影响的试验  

Experiment on the Effects of Premixed Gasoline and Ethanol on the Combustion and Emission Characteristics of Diesel Engine

作　　者：董世军[1] 栾兴存 欧彪[1] 成晓北[1] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《内燃机学报》2015年第5期393-398,共6页Transactions of Csice

基　　金：国家自然科学基金资助项目(51176056)

摘　　要：基于一台单缸柴油机,分别采用进气道喷射汽油和乙醇的预混方式,通过调节不同负荷下喷射汽油/柴油和乙醇/柴油燃料比例,以研究其对发动机燃烧与排放的影响.结果表明,低负荷下采用汽油或者乙醇预混,缸内最高燃烧压力降低,实现较为缓和的燃烧放热,均可以同时降低碳烟(Soot)和NOx,但HC和CO排放增加.较高负荷下随着预混比例增大,放热更加剧烈,缸内最大爆压升高.滞燃期随燃油预混比例增大而增大,但增大幅度随负荷增大而逐渐减小.与汽油预混方式相比,采用乙醇预混的方式滞燃期增大更加明显,且燃烧温度较低,在较高负荷下仍能实现较为缓和的燃烧放热,表明采用乙醇预混的方式有利于向高负荷拓展.Experiments were conducted on a single cylinder diesel engine with port-fuel-injection of gasoline and ethanol and direct-injection of diesel.The ratios of gasoline/diesel and ethanol/diesel were adjusted to study their effects on combustion characteristics under different loads.Results show that with premixed gasoline or ethanol under low loads,moderate combustion with lower peak pressure is achieved.Both soot and NOx are reduced while with increasing HC and CO emissions.Under higher loads,peak pressure increases with the increase of premixed ratio.Ignition delay increases at higher premixed ratio.But the growth rate decreases gradually with the increase of load.Compared with gasoline,premixed ethanol results in longer ignition delay.Because of lower combustion temperature with premixed ethanol,moderate combustion is achieved even under higher loads.Results show that ethanol has the potential to extend the load.

关 键 词：双燃料 汽油预混 乙醇预混 燃烧 排放 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]