首页|Effects of Water Injection on Combustion Emission and Knock Characteristics of Turbocharged Direct Injection Gasoline Engine
Effects of Water Injection on Combustion Emission and Knock Characteristics of Turbocharged Direct Injection Gasoline Engine
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NSTL
Korean Soc Automotive Engineers-Ksae
This paper studied the effects of water injection on combustion, emissions and knock. The results showed that direct water injection (DWI) absorbed more heat than inlet port water injection (PWI), resulting in lower cylinder pressure, higher oxygen content and longer combustion duration. And the turbulence kinetic energy of DWI model was greater, resulting in lower soot and CO emissions of DWI. Furthermore, the cooling effect of exhaust port side WI was better than intake port side, which reduced NO_(x)emission. Besides, the injection pressure of single injector WI was higher than double injector, which increased the combustion duration and reduced the cylinder pressure. The decrease of temperature under water dilution was the main reason for the reduction of NO_(x), while the increase of incomplete combustion increased the soot and CO emission. Finally, with the same amount of WI, the knock suppression effect of DWI models was better than PWI models. The knock intensity (KI) of all models decreased gradually with the increase of water, and DWI models decreased more rapidly. For PWI models, when the amount of water became smaller, the engine pressure fluctuation of certain areas in the cylinder increased slightly, weakening the influence of WI on engine knock.
Water injectionCombustionEmissionsKnockDirect injection gasoline engine
Junjun Wang、Fuwu Yan、Dong Yan、Wenlong Zhang、Guoqing Zhang、Jizhou Zhang、Ziyi Chen、Yu Wang
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School of Automotive Engineering, Wuhan University of Technology
Powertrain Department, Dong Feng Motor Corporation Technical Center
NSTL
Korean Soc Automotive Engineers-Ksae
