Influence of Injector Diameter (0.2-1.2 mm range) on Diesel Spray Combustion: Measurements and CFD Simulations

Bolla, Michele; Srna, Aleš; Wright, Yuri M.; Rotz, Beat von; Herrmann, Kai; Boulouchos, Konstantinos

doi:10.4271/2014-01-1419

Cited by 21 publications

(13 citation statements)

References 30 publications

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“…where the terms from left to right share the same physical interpretation as above, while the last two terms represent the effect of the fuel droplets on the evolution of the mixture fraction variance, as in Demoulin and Borghi. 59 Borghesi et al 44 reported the influence to be negligible for the same experimental setup as studied here; while in Srna et al 60 and Bolla et al, 61 it was found to be significant for much larger nozzles (e.g. used in marine applications).…”

Section: Simulation Computational Fluid Dynamics (Cfd) the Commercial Cfd Solver Star-cd Version 422 Is Used Throughout Thissupporting

confidence: 52%

Onset and progression of soot in high-pressure n-dodecane sprays under diesel engine conditions

Pandurangi

Bolla

Wright

et al. 2016

International Journal of Engine Research

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Soot onset in n-dodecane sprays is investigated both experimentally, by means of high-speed imaging data from the Sandia spray combustion vessel, and numerically, using the conditional moment closure combustion model and an integrated two-equation soot model in a Reynolds-averaged Navier-Stokes framework. Five operating conditions representative of modern diesel engines are studied at constant density (22.8 kg/m 3 ) with variations in ambient oxygen concentration and temperature. The reference case at 15% O 2 and 900 K is compared with measurements in terms of the evolving soot mass distribution and spatiotemporal distributions of formaldehyde and polycyclic aromatic hydrocarbons obtained by 355-nm laser-induced fluorescence (polycyclic aromatic hydrocarbons represented by C 2 H 2 in simulation) and soot optical thickness (KL) signal obtained by diffused back-illumination extinction imaging. All operating points are validated in terms of ignition delay and lift-off length, soot onset time and location, soot mass evolution, and peak location. Measurements show that time lag between ignition and soot onset is considerably increased by a reduction in ambient oxygen or temperature. The trend of this time lag is captured very well by the simulations, as is the evolving axial distribution of soot, despite the simple soot model employed. Building on the good agreement between spatiotemporal distributions in experiment and simulation, further results from the latter are extracted to provide insight into relevant processes. The advancing soot tip lags behind the fuel-vapor spray tip due to soot oxidation. Tracking the Lagrangian time history of notional fluid particles from the soot onset location back to the injector orifice reveals that their trajectories evolve along rich conditions (j . 1.5) throughout the entire path. Overall, novel insights obtained from experiments with respect to soot and soot precursor evolutions are complemented by simulations using the integrated conditional moment closure/soot modeling approach, showing encouraging results for prediction and understanding of transient soot processes in high-pressure diesel sprays.

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Section: Simulation Computational Fluid Dynamics (Cfd) the Commercial Cfd Solver Star-cd Version 422 Is Used Throughout Thissupporting

confidence: 52%

Onset and progression of soot in high-pressure n-dodecane sprays under diesel engine conditions

Pandurangi

Bolla

Wright

et al. 2016

International Journal of Engine Research

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“…To incorporate the liquid-phase fuel spray, a Lagrangian approach was used with the blob model for atomization and the Reitz-Diwakar [27] model for droplet secondary breakup. Turbulence-chemistry interaction was accounted for by the conditional moment closure (CMC) approach, previously applied for simulation of various high-pressure spray test rigs [28,29,30,31,32]. For soot modeling, the semi-empirical two-equation model of Leung et al [33] was employed within the CMC framework.…”

Section: Eth Zurich Switzerland (Ethz)mentioning

confidence: 99%

“…For Spray A, the simplified n-dodecane mechanism from Luo et al [18] was applied using in-situ adaptive tabulation (ISAT) [34] to reduce computational effort. An extended CMC model was employed to account for multiple injections [31].…”

Section: Eth Zurich Switzerland (Ethz)mentioning

confidence: 99%

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

Skeen

Manin

Pickett

et al. 2016

SAE Int. J. Engines

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The 4th Workshop of the Engine Combustion Network (ECN) was held September 5-6, 2015 in Kyoto, Japan. This manuscript presents a summary of the progress in experiments and modeling among ECN contributors leading to a better understanding of soot formation under the ECN “Spray A” configuration and some parametric variants. Relevant published and unpublished work from prior ECN workshops is reviewed. Experiments measuring soot particle size and morphology, soot volume fraction (fv), and transient soot mass have been conducted at various international institutions providing target data for improvements to computational models. Multiple modeling contributions using both the Reynolds Averaged Navier-Stokes (RANS) Equations approach and the Large-Eddy Simulation (LES) approach have been submitted. Among these, various chemical mechanisms, soot models, and turbulence-chemistry interaction (TCI) methodologies have been considered

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“…Low energy consumption and low pollution have become the inevitable tendency for the development of the current and future diesel engines. 1,2 The generation of combustion production and the level of fuel consumption are affected directly by the fuel injection stability of the injection system. 3,4 The fuel supply and injection processes of high pressure common rail system (HPCRS) are mutually independent due to the closed-loop control of the common rail pressure.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the fuel injection stability of high pressure common rail system for diesel engines

Bai

Lan

Fan

et al. 2019

International Journal of Engine Research

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High pressure common rail system is the state-of-the art technology for modern diesel engines to achieve energy conservation and emission reduction. The economy and emission performance of the diesel engines are influenced by the fuel injection stability of the high pressure common rail system. In this work, a high pressure common rail injector numerical model based on bond graph theory has been proposed. The comparisons between experimental results and numerical simulations show that the numerical model could reasonably predict the injection characteristics of the system. In order to reveal the essential rules and inherent characteristics of the fuel injection stability for high pressure common rail system, the rank variations of the state matrix at different injection pulse widths during fuel injection are obtained by means of a linear analysis. In addition, the distributions of eigenvalues for the state matrix in complex plane are investigated using Lyapunov method. The results show that the rank is influenced mainly by the movements of control valve and needle. Furthermore, the variation rule of the rank is independent of the injection pulse width before the needle is opened. The needle channel orifice of the injector plays a dominant role in transformation of the system from strong damping oscillation to underdamping oscillation. The opening and closing of control valve have significant effect on the stability of the system because its movement breaks the stability, and the movement of needle has remarkable effect on the oscillating characteristics of the system. High pressure common rail system is a complicated time-variant system with unstable pressure relief and strong oscillation injection.

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Influence of Injector Diameter (0.2-1.2 mm range) on Diesel Spray Combustion: Measurements and CFD Simulations

Cited by 21 publications

References 30 publications

Onset and progression of soot in high-pressure n-dodecane sprays under diesel engine conditions

Onset and progression of soot in high-pressure n-dodecane sprays under diesel engine conditions

A Progress Review on Soot Experiments and Modeling in the Engine Combustion Network (ECN)

Investigation on the fuel injection stability of high pressure common rail system for diesel engines

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