Effects of Intake Manifold Water Injection Mass on Combustion and Emission Characteristics of GDI Engine

被引：0
|
作者：
Qin J. [1 ,2 ]
Zhang Q. [1 ,2 ]
Pei Y. [2 ]
Li X. [2 ]
Peng Z. [2 ]
Peng Z. [2 ]
机构：
[1] Internal Combustion Engine Research Institute, Tianjin University, Tianjin
[2] State Key Laboratory of Engines, Tianjin University, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2020年 / 53卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Combustion characteristic; Emission characteristic; GDI engine; Intake manifold water injection mass;
D O I：
10.11784/tdxbz201912015
中图分类号：
学科分类号：
摘要：
Based on a turbocharged four-cylinder gasoline direct injection(GDI)engine, the influence of intake manifold water injection mass on combustion, fuel economy, and emissions was systematically investigated.Three usual engine speeds(2000r/min, 2800r/min, and 3200r/min)and a typical medium load(50%)were selected for the test.The range of water-fuel mass ratio was selected as 0-40%.The results showed that with the increase of μ, due to the high specific heat capacity of water and the enhancement of heat absorption from pyrolysis, the upward trend of the average pressure curve in cylinder became flat, and the maximum cylinder pressure and tα reduced sig-nificantly.The combustion delay period first remained largely steady and then extended.The crank angle CA50and θT first remained largely steady and then delayed, and the combustion duration gradually shortened.Compared with the conditions of μ=0, when μ=40%, at 2000r/min, 2800r/min, and 3200r/min, the maximum pressure in the cylinder decreased by about 0.72MPa, 0.64MPa, and 0.94MPa, respectively.The tα was reduced by 30℃, 68℃, and 47℃, respectively.The CA50 lagged by 3.3°CA, 3.1°CA, and 4.4°CA, respectively.The fuel consumption ratio(BSFC)first reduced slightly and then significantly increased.With μ=10% as the turning point, the BSFC reduced by about 1g/(kW•h), while with μ=40%, the BSFC increased by about 3g/(kW•h).The intake manifold water injection reduced the local high-temperature and local overconcentration areas, which is conducive to significantly reducing the NOx and smoke emissions of the GDI engine.Compared with the conditions of μ=0, the maximum reduction of NOx and smoke could reach about 30% when μ=40%.However, the effect of water injection on CO and HC emissions was relatively weak.With the increase of μ, CO and HC emissions showed a trend of slow decrease and slow increase, respectively.The GDI engine has the potential of energy saving and emission reduction by using the water injection strategy under a ratio of equivalence and it has broad engineering application prospects. © 2020, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
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页码：1167 / 1174
页数：7
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