A comprehensive modeling study of in-cylinder fluid flows in a high-swirl, light-duty optical diesel engine

Perini, Federico; Miles, Paul C.; Reitz, Rolf D.

doi:10.1016/j.compfluid.2014.09.011

Cited by 66 publications

(52 citation statements)

References 37 publications

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“…Perini et al [68] exhibited an optically accessible light duty single cylinder comprehensive model for an engine combustion research. Their computational model includes the realistic combustion chamber and ducts geometries.…”

Section: Effect Of Swirl Ratiomentioning

confidence: 99%

Homogeneous Charge Compression Ignition (HCCI) Engines: A Review

Sharma

Rao

Murthy

2015

Arch Computat Methods Eng

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The homogeneous charge compression ignition (HCCI) combustion is considered to be the principally promising future IC engine concepts. HCCI is a concept of hybrid combustion, between the Otto engine and Diesel engine. HCCI is however not a modern finding. Already in the early twentieth century hot bulb engines operated with an HCCI-like combustion. They were superior in terms of brake efficiency compared with the contemporary gasoline engines and at the same level as the diesel engines. High engine efficiencies and ultra low NO emissions and low particulates are the benefits of HCCI engines. Volumetric auto ignited combustion of the compressed lean air-fuel mixture is attributed to these benefits. There are few drawbacks also were there in HCCI engines like, low specific output, narrow operating range, lack control over the ignition process, long start up time and high emissions like CO and UHC emissions. The CO and UHC emissions can be after treated using catalytic converters. In this study a literature review on HCCI engine has been performed and the parameters affecting the HCCI combustion phasing, performance and emissions were discussed. Strategies to widen the peak load bearing capacity of HCCI engine, reducing the emissions like NOx, CO and UHC, easy autoignition were discussed in the present study.

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Section: Effect Of Swirl Ratiomentioning

confidence: 99%

Homogeneous Charge Compression Ignition (HCCI) Engines: A Review

Sharma

Rao

Murthy

2015

Arch Computat Methods Eng

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“…for engine combustion research. The results showed that Reynolds averaged Navier Stokes turbulence modeling approach is suitable for computational modeling of cycle averaged experimental measurements . As stated above, the CFD models are often not predictive of engine exhaust emissions due to the use of reduced chemical kinetic mechanisms.…”

Section: Introductionmentioning

confidence: 95%

Thermodynamic modeling and validation of in‐cylinder flow in diesel engines

Neshat

Nazemian

Honnery

2019

Env Prog and Sustain Energy

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The formation of a suitable air and fuel mixture in diesel engines is one of the most important factors in quality of combustion and engine exhaust emissions. The mixture formation depends on mass transfer phenomenon inside the combustion chamber. This study presents a new thermodynamic model to simulate the mass transfer phenomenon in diesel engines. Diesel engine is simulated utilizing a thermodynamic multi zone model coupled to a semi‐detailed chemical kinetics mechanism. Heat and mass transfer submodels are linked to the multi zone model. Bulk flow and diffusion mass transfer between zones are considered in the mass transfer submodel. Bulk mass transfer simulates fluid motion between different zones caused by piston speed and difference in zonal temperature and pressure. Diffusion mass transfer occurs due only to difference in composition of different zones. The results indicate diesel engine performance and exhaust emissions can be predicted accurately applying mass transfer submodels. Bulk mass transfer mechanism has more significant effects on engine performance and emission compared to diffusion mechanism. Neglecting mass transfer submodels, calculated in‐cylinder peak pressure is under predicted and both of exhaust NOx and soot are over predicted. The rates of soot oxidation reactions decrease and rates of NOx important reactions increase when mass transfer submodels are ignored. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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“…The sector mesh lacks some geometric details such as valve cut-outs on the piston surface and valve recesses on the cylinder head that lead to a different geometry of the bowl rim and squish regions, and change the global flow properties also due to the 600 need of calibrating an 'effective' squish height to capture the global compression ratio correctly. Also, it was previously demonstrated that a sector mesh model is not able to capture proper turbulence quantities which define the rate of local fuel-air mixing (Perini et al (2014)).…”

Section: Mixture Preparation In a Light-duty Optical Diesel Enginementioning

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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A comprehensive modeling study of in-cylinder fluid flows in a high-swirl, light-duty optical diesel engine

Cited by 66 publications

References 37 publications

Homogeneous Charge Compression Ignition (HCCI) Engines: A Review

Homogeneous Charge Compression Ignition (HCCI) Engines: A Review

Thermodynamic modeling and validation of in‐cylinder flow in diesel engines

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

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