Compression ignition characteristics and surrogate formulation of a high reactivity low research octane number (RON) gasoline

doi:10.3969/j.issn.1674-8484.2022.04.019

Abstract

Abstract:

A surrogate design was conducted for a high reactivity low octane number gasoline (HRG) to investigate the combustion and emission characteristics of gasoline compression ignition (GCI) mode. The ignition delay times of the HRG were measured using a rapid compression machine (RCM) in the effective temperature range of 690~920 K. Kinetic modelling study was conducted using Chemkin software with 3 surrogate fuels: n-heptane/iso-octane (PRF), n-heptane/iso-octane/toluene (TRF), and iso-hexane surrogates (iso-HS) consisting of iso-hexane, n-heptane, iso-octane and toluene. The results show that compared with PRF and TRF, the iso-hexane surrogates show more obvious negative temperature coefficient (NTC) behavior; The variation amplitude of the ignition delay times within the NTC region increases approximately linearly with iso-hexane contents increasing; The surrogate iso-HS2 consisting of 49.63% iso-hexane, 18.30% iso-octane, 26.29% n-heptane and 5.78% toluene (by mole fraction) can better capture the ignition characteristics of the HRG.

Key words: high reactivity low research octane number gasoline (HRG), surrogate, ignition delay, rapid compression machine (RCM)

CLC Number:

TK428.9

GUO Zexian, WANG Buyu, WANG Boyuan, ZHANG Qihang, CAI Kaiyuan, WANG Zhi, SHUAI Shijin. Compression ignition characteristics and surrogate formulation of a high reactivity low research octane number (RON) gasoline[J]. Journal of Automotive Safety and Energy, 2022, 13(4): 778-784.

Figures/Tables 9

References 20

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RON	61
MON	61
H/C摩尔比	2.23
20 ℃密度 / (kg·m^-3)	685.0
20 ℃运动粘度/ (mm²·s^-1)	0.630 7
低热值 / (MJ·kg^-1)	44.90
10%蒸发温度 / ℃	71.9
50%蒸发温度 / ℃	82.3
90%蒸发温度 / ℃	101.8
终馏点 / ℃	119.0

RON	61
MON	61
H/C摩尔比	2.23
20 ℃密度 / (kg·m^-3)	685.0
20 ℃运动粘度/ (mm²·s^-1)	0.630 7
低热值 / (MJ·kg^-1)	44.90
10%蒸发温度 / ℃	71.9
50%蒸发温度 / ℃	82.3
90%蒸发温度 / ℃	101.8
终馏点 / ℃	119.0

组分	w_m / %	组分	w_m / %
3-甲基己烷	11.3	3-甲基庚烷	2.2
正己烷	10.0	正戊烷	2.1
2-甲基戊烷	9.6	正辛烷	2.1
2-甲基己烷	9.2	2,3-二甲基丁烷	1.9
正庚烷	8.4	2-甲基庚烷	1.8
3-甲基戊烷	7.9	2,4-二甲基戊烷	1.7
2,3-二甲基戊烷	3.4	2,2-二甲基戊烷	1.3
甲基环戊烷	2.7	3,3-二甲基戊烷	1.2
苯	2.6	2,2-二甲基丁烷	1.2
异戊烷	2.3	3-乙基戊烷	1.2

组分	w_m / %	组分	w_m / %
3-甲基己烷	11.3	3-甲基庚烷	2.2
正己烷	10.0	正戊烷	2.1
2-甲基戊烷	9.6	正辛烷	2.1
2-甲基己烷	9.2	2,3-二甲基丁烷	1.9
正庚烷	8.4	2-甲基庚烷	1.8
3-甲基戊烷	7.9	2,4-二甲基戊烷	1.7
2,3-二甲基戊烷	3.4	2,2-二甲基戊烷	1.3
甲基环戊烷	2.7	3,3-二甲基戊烷	1.2
苯	2.6	2,2-二甲基丁烷	1.2
异戊烷	2.3	3-乙基戊烷	1.2

	PRF	TRF	iso-HS1	iso-HS2	iso-HS3
正庚烷	0.418 4	0.418 0	0.185 4	0.262 9	0.340 5
异辛烷	0.581 6	0.549 0		0.183 0	0.365 9
甲苯	-	0.033 0	0.070 2	0.057 8	0.045 4
异己烷	-	-	0.744 5	0.496 3	0.248 2