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- Title
Electron Microscopic Analysis of Concentration Field in Cylinder of Layered Lean Mixture Combustion GDI Engine.
- Authors
Wanqiang Qi
- Abstract
Objective: Based on electron microscopy, the in-cylinder concentration field of layered lean mixture combustion gasoline direct injection (GDI) engine is analyzed, the emission characteristics of Polycyclic Aromatic Hydrocarbons (PAHs) and soot particles are studied, and the high emission of soot particles from GDI engine is solved. Methods: In this study, PAHs and soot particles are sampled from a four-cylinder air-guided watercooled turbocharged GDI engine. Through transmission electron microscopy, the microscopic structure of particulate matter is observed and its emission characteristics are analyzed. The effects of different injection pressure, different EGR (Exhaust Gas Re-circulation) rate and different ignition time on PAHs and soot particulate emissions are detected respectively. The particulate matter model of GDI engine is established and the simulation calculation is carried out. Result: In the range of 1000rpm-3000rpm under 120Nm medium load, the concentration of PAHs and soot particles decreases first and then increases with the increase of speed, while in the range of 60Nm under low load, the concentration of PAHs and soot particles increases first, then decreases and then increases with the increase of speed. With the increase of injection pressure, the concentration of PAHs and soot particles decreases. With the increase of EGR rate, the concentration of PAHs and soot particles decreases. With the advance of ignition time, the concentration of PAHs and soot particles first decreases and then increases. In the simulation calculation, the concentration of PAHs and soot particles rises sharply after the exhaust valve is opened, and then tends to be stable. The values tending to be stable basically coincide with the experimental values. Conclusion: The emission of PAHs and soot particles can be reduced by increasing injection pressure, increasing EGR rate and properly postponing ignition time. At the same time, the particle model established in this study can effectively predict the concentration field in the cylinder of the GDI engine.
- Subjects
ELECTRON microscopy; POLYCYCLIC aromatic hydrocarbon analysis; SOOT analysis; COMBUSTION equipment; COMBUSTION gases; EXHAUST gas recirculation; PARTICULATE matter
- Publication
Acta Microscopica, 2019, Vol 28, Issue 6, p1709
- ISSN
0798-4545
- Publication type
Article