Computational Modeling of Diesel Spray Combustion with Multiple Injections

Abstract

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CFD analysis of combustion and emission characteristics of primary reference fuels: from transient Diesel spray to heavy-duty engine

“…The inclusion of atomization sub-model might improve the prediction, which is of great interest for future investigation. The computed vapor penetration evidences a rather good agreement with experiments, which is a prerequisite for proceeding to combustion simulations and further validation of the numerical setup was reported in [35].…”

“…Regarding the turbulent spray modeling, a set of models falling into such technique were compared in [29,30], including tabulated well-mixed model (TWM), tabulated representative flamelet interactive model (TRIF), tabulated presumed PDF approach (TPPDF), and the tabulated flamelet progress variable approach (TFPV). The results proved that the TFPV model based on approximated diffusion flamelets [31][32][33] performs better in the description of spray flames due to the consideration of turbulence-chemistry interaction and local distribution of scalar dissipation rate, which has also been comprehensively validated by authors in the modeling of spray flames with single and double injections [34,35], as well as light-and heavy-duty Diesel engines [29,36,37].…”

“…In the following discussion, the analysis technique of integrated plots is thoroughly used to study temporal and spatial features of the flame structure and soot characteristics. Such technique has been widely used in both experimental and numerical Diesel spray studies [55] [56] [35], known as intensity-axial distance-time (IXT) plot. CFD information being relevant to the combustion and emission features, such as hydroxyl (OH), formaldehyde (CH 2 O), and acetylene (C 2 H 2 ) mass fractions, soot volume fraction are integrated along the symmetry axis in present work, according to: Fuel 301 (2021) 120994…”

CFD Modeling of Reacting Diesel Sprays with Primary Reference Fuel

“…Results from these methods are reported in Figure 5, together with experimental data, showing the value from the PLV approach with a threshold value of 2e-6 is very close to the measurement. Such achieved accuracy is adequate for proceeding to combustion simulations and further validation of the numerical setup was reported in [23].…”

“…Techniques that fall into this category include the flame-generated manifold (FGM) [16], the flame prolongation of ILDM (FPI) [17] or the flamelet progress variable (FPV) [18]. Among them, one interesting approach, the tabulated flamelet progress variable (TFPV) based on approximated diffusion flamelets [19,20,21], has been comprehensively validated in the modeling of spray flames with single and double injections [22,23], as well as light-and heavy-duty Diesel engines [24,25]. The successful application of the TFPV approach in the presence of multiple injections shows that it should potentially be able to capture lean-rich premixed and diffusion flames as well as auto-ignition modes of combustion, simultaneously [26].…”