TY - JOUR
T1 - Numerical Studies on Temporal and Spatial Distribution of Equivalence Ratio in Diesel Combustion Using Large Eddy Simulation
AU - Zhou, Beini
AU - Yamada, Shotaro
AU - Adachi, Takayuki
AU - Kusaka, Jin
N1 - Publisher Copyright:
Copyright © 2019 SAE International.
PY - 2020
Y1 - 2020
N2 - To identify ways of achieving good mixture formation and heat release in diesel spray combustion, we have performed Large Eddy Simulation (LES) using a detailed chemical reaction mechanism to study the temporal and spatial distribution of the local equivalence ratios and heat release rate. Here we characterize the effect of the fuel injection rate profile on these processes in the combustion chamber of a diesel engine. Two injection rate profiles are considered: A standard (STD) profile, which is a typical modern common rail injection profile, and the inverse delta (IVD) profile, which has the potential to suppress rich mixture formation in the spray tip region. Experimental data indicate that the formation of such mixtures may extend the duration of the late combustion period and thus reduce thermal efficiency. Analyses of the heat release per unit fuel mass and unit entrained O2 mass under the two injection regimes indicate that IVD injection reduces the density of the fuel-air mixture in the spray tip region, increases the leanness of the spray core region, and enhances O2 entrainment, improving the heat release process.
AB - To identify ways of achieving good mixture formation and heat release in diesel spray combustion, we have performed Large Eddy Simulation (LES) using a detailed chemical reaction mechanism to study the temporal and spatial distribution of the local equivalence ratios and heat release rate. Here we characterize the effect of the fuel injection rate profile on these processes in the combustion chamber of a diesel engine. Two injection rate profiles are considered: A standard (STD) profile, which is a typical modern common rail injection profile, and the inverse delta (IVD) profile, which has the potential to suppress rich mixture formation in the spray tip region. Experimental data indicate that the formation of such mixtures may extend the duration of the late combustion period and thus reduce thermal efficiency. Analyses of the heat release per unit fuel mass and unit entrained O2 mass under the two injection regimes indicate that IVD injection reduces the density of the fuel-air mixture in the spray tip region, increases the leanness of the spray core region, and enhances O2 entrainment, improving the heat release process.
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M3 - Conference article
AN - SCOPUS:85096622077
VL - Part F163706
JO - SAE Technical Papers
JF - SAE Technical Papers
SN - 0148-7191
IS - 2020
T2 - SAE 25th Small Engine Technology Conference and Exposition: Small Powertrains - Innovating for Their Future Role, SETC 2019
Y2 - 19 November 2019 through 21 November 2019
ER -