A comparative study on effects of homogeneous or stratified hydrogen on combustion and emissions of a gasoline/hydrogen SI engine

被引：63

作者：

Yu, Xiumin ^{[1
]}

Li, Guanting ^{[1
]}

Du, Yaodong ^{[1
]}

Guo, Zezhou ^{[1
]}

Shang, Zhen ^{[1
]}

He, Fengshuo ^{[1
]}

Shen, Qingxu ^{[1
]}

Li, Decheng ^{[1
]}

Li, Yinan ^{[1
]}

机构：

[1] Jilin Univ, State Key Lab Automot Simulat & Control, Renmin St 5988, Changchun 130022, Jilin, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2019年 / 44卷 / 47期

基金：

中国国家自然科学基金;

关键词：

Dual-fuel engine; Combined injection; Hydrogen direct-injection; Excess air ratio; Combustion; Emission; SPARK-IGNITION ENGINE; GASOLINE-ENGINE; DIRECT-INJECTION; PERFORMANCE; PROPORTION; STRATEGY;

D O I：

10.1016/j.ijhydene.2019.08.029

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A comparative study on effects of homogeneous or stratified hydrogen on combustion and emissions was presented for a gasoline/hydrogen SI engine. Three kinds of injection modes (gasoline, gasoline plus homogeneous hydrogen and gasoline plus stratified hydrogen) and five excess air ratios were applied at low speed and low load on a dual fuel SI engine with hydrogen direct injection (HDI) and gasoline port injection. The results showed that, with the increase of excess air ratio, the brake thermal efficiency increases firstly then decreases and reaches the highest when the excess air ratio is 1.1. In comparison with pure gasoline, hydrogen addition can make the ignition stable and speed up combustion rate to improve the brake thermal efficiency especially under lean burn condition. Furthermore, it can reduce the CO and HC emissions because of more complete combustion, but produce more NOx emissions due to the higher combustion temperature. Since, in the gasoline plus stratified hydrogen mode, the hydrogen concentration near the sparking plug is denser than that of homogeneous hydrogen, the ignition is more stable and faster, which further speed up the combustion rate and improve the brake thermal efficiency. In the gasoline plus stratified hydrogen mode, the brake thermal efficiency increases by 0.55%, the flame development duration decreases by 1.0 degrees CA, rapid combustion duration decreases by 1.3 degrees CA and the coefficient of variation (COV) decreases by 9.8% on average than that of homogeneous hydrogen. However, in the gasoline plus stratified hydrogen mode, due to the denser hydrogen concentration near the sparking plug and leaner hydrogen concentration near the wall, the combustion temperature and the wall quenching distance increase, which make the NOx and HC emissions increase by 14.3% and 12.8% on average than that of homogeneous hydrogen. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：25974 / 25984

页数：11

共 29 条

[1] Emission characteristics of an hydrogen-CH4 fuelled spark ignition engine [J].