Research on the Influence of Water/Steam Injection Timing on Gasoline Engine Combustion and Emission
The thermodynamic model of the LJ465Qgasoline engine verified by experiments is used to study the influence of in-cyl-inder water and steam injection timing on engine performance and emissions.The results show that when the engine is 2000r/min and full load,the injection mass is 9mg,the injection pressure is 10bar,the injection time is(-110～-60)℃ A,the output power under water injection conditions gradually decreases with the lag of the injection time,the power can be increased by 0.71% and the fuel consumption rate can be reduced by 0.74% .After water injection,the local high temperature and local over-rich area are reduced,which helps to significantly reduce NOx emission,which is reduced by 66.3% at most,and HC emission are increased.The output power of superheated steam injection increased gradually with the lag of injection time,and the power increased by 1.7% at most,and the fuel consumption rate decreased by 1.8% .NOx emission decrease with the increase of the injection time,which decreased by 55.2% and HC emission decreased by 15.4% .In summary,in-cylinder steam injection has certain advantag-es compared to the effect of water on engine performance and emissions.
Gasoline EngineIn-Cylinder Water InjectionIn-Cylinder Steam InjectionInjection TimeSimula-tion Study
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