Effect of Temperature Conditions on Flame Evolutions of Turbulent Jet Ignition

Jiaying Pan, Yu He, Tao Li, Haiqiao Wei, Lei Wang and Gequn Shu
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Jiaying Pan: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Yu He: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Tao Li: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Haiqiao Wei: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Lei Wang: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
Gequn Shu: State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

Energies, 2021, vol. 14, issue 8, 1-17

Abstract: Turbulent jet ignition technology can significantly improve lean combustion stability and suppress engine knocking. However, the narrow jet channel between the pre-chamber and the main chamber leads to some difficulties in heat exchange, which significantly affects combustion performance and mechanical component lifetime. To clarify the effect of temperature conditions on combustion evolutions of turbulent jet ignition, direct numerical simulations with detailed chemical kinetics were employed under engine-relevant conditions. The flame propagation in the pre-chamber and the early-stage turbulent jet ignition in the main chamber were investigated. The results show that depending on temperature conditions, two types of flame configuration can be identified in the main chamber, i.e., the normal turbulent jet flame propagation and the spherical flame propagation, and the latter is closely associated with pressure wave disturbance. Under low-temperature conditions, the cold jet stoichiometric mixtures and the vortexes induced by the jet flow determine the early-stage flame development in the main chamber. Under intermediate temperature conditions, pre-flame heat release and leading pressure waves are induced in the jet channel, which can be regarded as a transition of different combustion modes. Whereas under high-temperature conditions, irregular auto-ignition events start to occur, and spherical flame fronts are induced in the main chamber, behaving faster flame propagation.

Keywords: turbulent jet ignition; ignition characteristics; temperature conditions; combustion modes; pressure wave (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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