Effect of Spark Ignition Timing and Water Injection Temperature on the Knock Combustion of a GDI Engine

Aqian Li and Zhaolei Zheng
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Aqian Li: Key Laboratory of Low-grade Energy Utilization Technologies and System, Ministry of Education, Chongqing University, Chongqing 400044, China
Zhaolei Zheng: Key Laboratory of Low-grade Energy Utilization Technologies and System, Ministry of Education, Chongqing University, Chongqing 400044, China

Energies, 2020, vol. 13, issue 18, 1-24

Abstract: A turbocharged downsizing spark ignition (SI) engine cooperating with an in-cylinder direct injection technology is one of the most effective ways to improve the power and economy of gasoline engines. However, engine knock has limited the application and development of the downsizing of gasoline engines. Water injection technology can effectively suppress the knock. In this study, a method of numerical simulation was used to explore the effect of the water injection temperature on the combustion and suppression of the knock. First of all, the knock of the gasoline engine was induced by advancing the spark timing. Then, when the other conditions were the same, different water injection temperatures were set. The results show that lowering the water injection temperature reduced the knock intensity in the cylinder, but increasing the water injection temperature made the water distribution more uniform, and the peak values of each monitoring point were more consistent. The circulating work power increased with the increase of the water injection temperature. For emissions, as the temperature of the water injection increased, the emissions of soot and unburned hydrocarbons (UHCs) decreased, and NO x slightly increased.

Keywords: water injection; temperature; knock; combustion; emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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