New Insights into Abnormal Combustion Phenomena Induced by Diesel Spray-Wall Impingement under Engine-Relevant Conditions

Zhijie Li, Jie Pan, Wei Li, Xiangting Wang, Haiqiao Wei and Jiaying Pan
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Zhijie Li: Weichai Power Co., Ltd., Weifang 261041, China
Jie Pan: Weichai Power Co., Ltd., Weifang 261041, China
Wei Li: Weichai Power Co., Ltd., Weifang 261041, China
Xiangting Wang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Haiqiao Wei: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Jiaying Pan: Weichai Power Co., Ltd., Weifang 261041, China

Energies, 2022, vol. 15, issue 8, 1-10

Abstract: High altitude and low temperature is the common extreme environment for internal combustion engines. Under such operating conditions, heavy-duty diesel engines often suffer from serious abnormal combustion, such as knocking combustion, which results in piston crown breakdown and cylinder head erosion. Spray-wall impingement and pool fires are considered potential causes; however, the detailed mechanism remains poorly understood owing to the lack of research data. In this study, for the first time, the destructive abnormal combustion induced by diesel spray-wall impingement was identified using an optical rapid compression machine under engine-relevant conditions at high altitudes. Combining instantaneous pressure and temperature measurements with simultaneously recorded high-speed photography gives useful insights into understanding the detailed combustion processes. The experimental results show that depending on the extent of diesel spray-wall impingement, supersonic detonation-like reaction fronts featuring bright luminosity can be observed. The propagation of these reaction fronts in-cylinder results in severe pressure oscillations with an amplitude approaching hundreds of atmospheres, which is like the super-knock events in boosted direct-injection spark-ignition engines. Further parametric analysis indicates that the interplay between the diffusion combustion controlled by diesel spray and the premixed combustion dominated by attached film evaporation results in the formation of abnormal combustion. Destructive reaction fronts tend to occur at a prolonged ignition delay time, which facilitates the mixing between diesel evaporation and hot air.

Keywords: spray-wall impingement; spontaneous ignition; supersonic reaction front; pressure oscillation; rapid compression machine (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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