Abstract
Ignition and flame propagation phenomenon of diesel fuel combustion was investigated in an optical single cylinder engine. Conventional non-premixed diesel combustion and partially premixed combustion types were investigated. Experiments were performed on an optical single cylinder, heavy duty, four-stroke compression ignition engine with a quartz elongated piston bowl and 45° mirror was used for visualization as a measurement technique. . Self-ignition, flame propagation, heat rejection and effects on number of pilot injections on combustion visualization are investigated. In conventional diesel with closed and far pilot and partially premixed charge compression ignition (PCCI) tests were performed.
Highlights
Diesel engines are the main stream in the heavy duty applications today and this will continue to be a main stream on the future applications considering high thermal efficiency of compression ignition combustion
Current and possible future emission regulations of commercial heavy duty vehicles are mainly focused on NOx and soot emissions which become more restricted with latest EU6 regulations and future emission regulations will even be more restrictor
A pilot injection is performed at 11 deg crank angle (CA) before top dead center (BTDC) and a main injection is started at 2 deg
Summary
Diesel engines are the main stream in the heavy duty applications today and this will continue to be a main stream on the future applications considering high thermal efficiency of compression ignition combustion. In this study both conventional non-premixed and partially premixed charged diesel combustion (PCCI) visualizations are investigated in terms of flame propagation and heat rejection.[1]. [5] In this study, a curved bottom surface is used to reduce the optic distortions and thermodynamic engine similar piston is used in order to replicate the combustion behavior as much as possible Very smooth/simplified or flat surfaced piston bowl shapes are used in the experiments. [5] In this study, a curved bottom surface is used to reduce the optic distortions and thermodynamic engine similar piston is used in order to replicate the combustion behavior as much as possible
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