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Comparative study on combustion characteristics of lean premixed CH4/air mixtures in RCM using spark ignition and turbulent jet ignition in terms of orifices angular position change

The increase in ignitability consist an main aim of implementation the turbulent jet ignition (TJI) in relation to the combustion of diluted charges. Such an ignition has been introduced to the lean-burn CNG engine in the scope of GasOn-Project (Gas Only Internal Combustion Engines). In this study the impact of TJI application on the main combustion has been investigated using RCM and analyzed based on the indicating and optical data. The images have been recorded using LaVision HSS5 camera and post-processed with Davis software. Second part of the study consist the analysis of combustion regarding the variation in the angularity of pre-chamber nozzles with indicating measurement approach. It has been noted, that combustion with TJI indicates significantly bigger flame luminescence and in parallel its faster development, than combustion initiated with SI. The positive impact of nozzles angular position has been found in thestatic charge movement conditions, regarding the combustion stability. Key words:CNG, turbulent jet ignition, pre-chamber, optical analysis, flame development, heat release rate
Topic: Combustion processes in SI and CI engines
Author: Wojciech BUESCHKE
Co-authors: Maciej SKOWRON, Krzysztof WISŁOCKI, Filip SZWAJCA