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International Journal of Automotive Technology > Volume 23(1); 2022 > Article
International Journal of Automotive Technology 2022;23(1): 1-11.
doi: https://doi.org/10.1007/s12239-022-0001-6
FUEL DROPLET BEHAVIOR IN A CYLINDER UNDER THE DIFFERENCE CO2 MOLE FRACTION CONDITIONS CONTROLLED BY SIMULATED-EGR IN CI ENGINE
Se Hun Min1, Hyun Kyu Suh2
1Kongju National University
2Kongju National University
PDF Links Corresponding Author.  Hyun Kyu Suh , Email. hksuh@kongju.ac.kr
ABSTRACT
The objective of this numerical study is to investigate the effect of CO2 mole fraction controlled by simulated-exhaust gas recirculation (EGR) on fuel droplet behavior for simultaneous exhaust emissions reduction in compression ignition engine under early injection conditions. In the simulation, the intake air initial composition was changed to simulate the EGR with changing CO2 mole fraction. To consider early injection conditions, start of nergizing timing was changed. The results were analyzed in terms of spray tip penetration, Sauter mean diameter, evaporated fuel ratio, and fuel mass fraction distributions. When CO2 mole fraction increased, spray tip penetration was decreased because the kinetic energy of the injected fuel droplet was reduced by the high density of CO2 and SMD was decreased since the high density of CO2 disturbed the fuel progress, which induced the fuel droplet to have low kinetic energy. In addition, when the start of energizing timing was before top dead center 23 degree and CO2 mole fraction was 20 %, exhaust emissions were expected to simultaneously reduce because the rapidly evaporated fuel by the collision effect promoted the combustion, and it made to evaporate the formed liquid wall film, which may absorb the combustion temperature by the latent heat vaporization.
Key Words: CO2 mole fraction, Fuel droplet behavior, Fuel mass fraction, Simulated-EGR exhaust emissions
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