丁醇/柴油混合燃料对压燃式发动机燃烧及微粒排放特征的影响

doi:10.13229/j.cnki.jdxbgxb20180907

Abstract

Abstract:

The effects of butanol/diesel blends on engine combustion and particulate emission characteristics under different operating conditions and blended ratios were investigated on a four-cylinder, common rail, turbocharged diesel engine. The results indicates that the increase in butanol blended ratio leads to prolonged ignition delay, increased premixed combustion and delayed combustion phase, the effect of which is more significant under low load conditions. Butanol/diesel fuel can dramatically reduce exhaust smoke and particulate emissions without increasing NO _x emissions, however, the thermal efficiency is slightly lower than that of pure diesel. Most of the particulate emissions from butanol/diesel blended fuel are ultrafine particles, with a ratio of more than 99%. With the increase in butanol ratio, the number concentration of particles in each particle diameter range decreases, which is more distinctive under high load condition. The concentration of accumulated particles and total particles increase significantly with the introduction of Exhaust Gas Re-circulation (EGR). However, the addition of butanol enhanced the tolerance of the mixed fuel to EGR. Butanol/diesel blend fuel combined with EGR strategy can reduce NO _x and particulate emissions simultaneously.

Key words: power machinery and engineering, compression ignition engine, butanol/diesel blends, particle emission characteristics

CLC Number:

TK421.2

Qiao WANG,Wan-chen SUN,Liang GUO,Peng CHENG,Lu-yan FAN,Guo-liang LI. Effects of butanol/diesel blends on combustion and particulate emission characteristics of compression ignition engine[J].Journal of Jilin University(Engineering and Technology Edition), 2019, 49(6): 1920-1928.

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项目	指标
型式	4缸、4冲程、增压中冷
（缸径×行程）/（mm×mm）	93×102
排量/L	2.771
压缩比	17.2∶1
燃油供给系统	高压共轨
喷油器喷孔数目	6
喷射锥角/（°）	150
喷孔直径/mm	0.13
[标定功率/转速]/[kW/（r·min^-1）]	80/3400
[最大转矩/转速]/[（N·m）/(r·min^-1）]	260/1800

项目	柴油	正丁醇	B10	B30
密度(15 ℃)/（kg·m^-3）	821.9	810.9	820.0	816.8
C质量分数/%	84.7	64.9	82.72	78.76
H质量分数/%	13.2	13.5	14.08	13.16
O质量分数/%	0	21.6	2.07	6.73
十六烷值	52	25	47.8	37.3
沸点/℃	180~230	117.5	-	-
低热值/（MJ·kg^-1）	43.85	33.1	42.62	40.42
汽化潜热/（kJ·kg^-1）	270	582	300	362.6

Effects of butanol/diesel blends on combustion and particulate emission characteristics of compression ignition engine

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