首页|Effect of water injection on the knock, combustion, and emissions of a direct injection gasoline engine
Effect of water injection on the knock, combustion, and emissions of a direct injection gasoline engine
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A turbocharged downsizing spark ignition (SI) engine cooperating with in-cylinder direct injection technology is one of the most effective ways to improve the fuel economy and to reduce the emissions of gasoline engines, but knock combustion limits the application and development of downsizing of SI engines in practice. In this research, a numerical simulation method was used to study the feasibility of in-cylinder direct water injection technology to weaken the knock tendency of a turbocharged direct injection gasoline (GDI) engine and improve its combustion emission performance. First, the knock of a certain type of turbocharged direct injection gasoline engine was induced by increasing the spark timing, thereby determining the position at which the end mixture was spontaneously ignited. Then, at a given water injection moment, the influence of the amount of water injection on the knock and emissions of the turbocharged direct injection gasoline engine was investigated. The results show that the knock intensity gradually decreased with the increase of the water injection quality. For the cyclic work, the amount of circulating work decreased with the increase of the water injection quality. Water injection is beneficial for reducing the emissions of nitrogen oxides (NOX), carbon monoxide (CO), and unburned hydrocarbons (UHC). However, the soot emissions will increase as the amount of water injection increases.
Water injectionDirect injection gasoline engineKnockEmissionCombustion
Li, Aqian、Zheng, Zhaolei、Peng, Tao
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Chongqing Univ, Key Lab Low Grade Energy Utilizat Technol & Syst, Minist Educ, Chongqing 400044, Peoples R China
China Natl Heavy Duty Truck Croup Chongqing Fuel, Chongqing 400044, Peoples R China
NETL
NSTL
Elsevier
