Pilot Injection Ignition Properties Under Low-Temperature, Dilute In-Cylinder Conditions

Miles, Paul C.; Sahoo, Dipankar; Busch, Stephen; Trost, Johannes; Leipertz, Alfred

doi:10.4271/2013-01-2531

Cited by 18 publications

(12 citation statements)

References 32 publications

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“…All of the experimental measurements were carried out using the Sandia National Laboratories light-duty optical engine facility [9,10]. The engine used in the studies is a modified version of the GM lightduty 1.9L engine, provided with an optical piston that retains the full geometric details of the production piston.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental campaigns of [9,10] provide a unique opportunity for the validation of spray models for internal combustion engine simulations, since the exact fuel components can be modeled for the physical processes occurring in the engine: injection, atomization, vaporization, and mixing and ignition. Although the ignitability studies were conducted with the #2 diesel fuel, the careful matching of the ignition behavior tothe DPRF blend, and to the PRF25 blends used in earlier work [11,12] allows the chemical modeling to be pursued with confidence.…”

Section: Model Developmentmentioning

confidence: 99%

“…The aim of this study was thus to assess and validate a CFD engine model for simulating pilot injection phenomena in the Sandia light-duty optical diesel engine, operated with a Diesel Primary Reference Fuel mixture. Extensive experimental campaigns have been conducted on this engine to measure and understand the mixture preparation and pilot ignition limits for a wide range of operating conditions relevant to low-temperature combustion strategies [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Then, the computational methodology is described, and the sub-models chosen to describe the spray physical processes and the ignition kinetics are studied for some simple, fundamental test-cases. Finally, the model's reliability with varying operating parameters is assessed against local equivalence ratio measurements of [9], and the ignitability limits of a pilot injection over a range of charge dilutions and pilot injection parameters are modeled and compared to the experiments of [10].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling the Ignitability of a Pilot Injection for a Diesel Primary Reference Fuel: Impact of Injection Pressure, Ambient Temperature and Injected Mass

Perini¹,

Sahoo²,

Miles³

et al. 2014

SAE Int. J. Fuels Lubr.

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In this paper, we studied the accuracy of computational modeling of the ignition of a pilot injection in the Sandia National Laboratories (SNL) light-duty optical engine facility, using the physical properties of a cetane/iso-cetane Diesel Primary Reference Fuel (DPRF) mixture and the reaction kinetics of a well-validated mechanism for primary reference fuels. Local fuel-air equivalence ratio measurements from fuel tracer based planar laser-induced fluorescence (PLIF) experiments were used to compare the mixture formation predictions with KIVA-ERC-based simulations. The effects of variations in injection mass from 1 mg to 4 mg, in-cylinder swirl ratio, and near-TDC temperatures on non-combusting mixture preparation were analyzed, to assess the accuracy of the model in capturing average jet behavior, despite its inability to model the nonnegligible jet-by-jet variations seen in the experiments. Fired simulations were able to capture well the measured ignitability trends at the different injection conditions tested, but showed some deviations in the minimum temperature needed for robust ignition, pointing out the need for further work to focus on achieving fully comprehensive modeling with detailed chemical kinetics of the DPRF58 mixture and a full engine geometry representation.

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Section: Methodsmentioning

confidence: 99%

Section: Model Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling the Ignitability of a Pilot Injection for a Diesel Primary Reference Fuel: Impact of Injection Pressure, Ambient Temperature and Injected Mass

Perini¹,

Sahoo²,

Miles³

et al. 2014

SAE Int. J. Fuels Lubr.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Pickett et al (2011) have extensively measured spray injection and mixture 35 formation at high pressures in a constant volume vessel using schlieren and Rayleigh scattering imaging, providing experimental spray data (e.g., the Engine Combustion Network 'Spray A' case), and showing how a zero-dimensional spray model can capture mixture formation correctly if its geometrical structure is properly initialized. Sahoo et al (2011Sahoo et al ( , 2012Sahoo et al ( , 2013; Miles et al (2013); 40 Perini et al (2013) have presented mixture preparation imaging using planar laser-induced fluorescence (PLIF) of full and pulsed injections in a light-duty optical engine, showing significant differences in mixture formation for transient injections.…”

Section: Introductionmentioning

confidence: 99%

Improved atomization, collision and sub-grid scale momentum coupling models for transient vaporizing engine sprays

Perini

Reitz

2016

International Journal of Multiphase Flow

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A computationally efficient spray model is presented for the simulation of transient vaporizing engine sprays. It is applied to simulate high-pressure fuel injections in a constant volume chamber and in mixture preparation experiments in a light-duty internal combustion engine. The model is based on the Lagrangian-erature. However, different values were seen for the gas-jet model constants for accurate simulations of the initial spray transient. The results show that there is a direct correlation between the predicted initial liquid-phase transient and the global gas-phase jet penetration. Model validation was also performed in engine simulations with the same set of constants. The model captured mixture preparation well in all cases, proving its suitability for simulations of transient spray injection in engines. 45 ulations, the Lagrangian-Particle/Eulerian-Fluid (LDEF, Dukowicz (1980)) approach is commonly adopted because of the many scales separating the internal injector and near-nozzle flows that affect the liquid phase development, and the consequent gas-phase turbulent flame in the combustion chamber. Because of the lack of resolution in the description of the liquid spray core, phenomeno-50 3 logical atomization models have been developed (e.g., Reitz and Bracco (1982); Reitz (1987); Reitz and Diwakar (1987); Tanner (1997); Habchi et al. (1997); Huh et al. (1998); Bianchi and Pelloni (1999); Beale and Reitz (1999); Hiroyasu (2000); Gorokhovski and Herrmann (2008b)), within the LDEF framework. This approach, although successful in a wide variety of simulations, suffers from 55 significant time-step and grid-resolution dependency, which is especially true for Reynolds-Averaged Navier-Stokes (RANS) approaches where all turbulence scales of the flow are modeled, and the grid resolution is more than one order of magnitude coarser than the characteristic injector diameter. Thus, some recent approaches have attempted to reduce the dependency of spray simula-60 tions on grid resolution and model constants by applying subcycling schemes to the Lagrangian particle step (Wang et al. (2010)), using region-of-interest instead than Computational Fluid Dynamics (CFD) grid-based collision calculations (Schmidt and Rutland (2004); Munnannur and Reitz (2009)), and using model-computed instantaneous field velocities in the near-nozzle region instead 65 of the under-resolved CFD flow fields (Ra et al. (2005); Abani et al. (2008a,b)). The last approach makes use of predictions from the theory of turbulent round jets (see, for example, Islam and Tucker (1980); Bremhorst and Hollis (1990); Abraham (1996); Iyer and Abraham (1997); Song and Abraham (2003); Singh and Musculus (2010); Musculus (2009); Liepmann and Gharib (1992)). These 70 models can predict a turbulent jet's penetration, velocity profiles, and gas concentrations within the jet, based on parameters such as an effective diameter, the densities of the gaseous environment, and the time-varying injection velocity. The models provide relevant flow properties that wou...

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Fluorescence characteristics of the fuel tracer 1-methylnaphthalene for the investigation of equivalence ratio and temperature in an oxygen-containing environment

et al. 2019

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Pilot Injection Ignition Properties Under Low-Temperature, Dilute In-Cylinder Conditions

Cited by 18 publications

References 32 publications

Modeling the Ignitability of a Pilot Injection for a Diesel Primary Reference Fuel: Impact of Injection Pressure, Ambient Temperature and Injected Mass

Modeling the Ignitability of a Pilot Injection for a Diesel Primary Reference Fuel: Impact of Injection Pressure, Ambient Temperature and Injected Mass

Improved atomization, collision and sub-grid scale momentum coupling models for transient vaporizing engine sprays

Fluorescence characteristics of the fuel tracer 1-methylnaphthalene for the investigation of equivalence ratio and temperature in an oxygen-containing environment

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