Effect of Cooling of Burned Gas by Vertical Vortex on NOx Reduction in Small DI Diesel Engines

Shimo, Daisuke; Kataoka, Motoshi; Fujimoto, Hidefumi

doi:10.4271/2004-01-0125

Cited by 5 publications

(4 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the Mazda design, the focus was on reduction in NO x . 5,59 In this concept, the outer, ''egg-shaped'' vortex is thought to transport hot combustion products to the cylinder center where they mix rapidly with cooler surrounding charge, thereby quenching thermal NO x production. The thermal efficiency is also increased due to a shortening of the combustion duration.…”

Section: Bowl Pip Geometrymentioning

confidence: 99%

See 1 more Smart Citation

A review of design considerations for light-duty diesel combustion systems

Miles

Andersson

2015

International Journal of Engine Research

View full text Add to dashboard Cite

Practical aspects of light-duty diesel combustion system design are reviewed, with an emphasis on design considerations reported by manufacturers and engine design consultancies. The factors driving the selection of compression ratio, stroke-to-bore ratio, and various aspects of combustion chamber geometry are examined, along with the trends observed in these parameters in recently released engines. The interactions among geometric characteristics, swirl ratio, and the fuel injection nozzle parameters are also reviewed.

show abstract

Section: Bowl Pip Geometrymentioning

confidence: 99%

“…The thermal efficiency is also increased due to a shortening of the combustion duration. 59 Toyota has also recognized the importance of the outer vortex on promoting soot oxidation. 60 Matching geometry, flow, and fuel injection parameters…”

Section: Bowl Pip Geometrymentioning

confidence: 99%

A review of design considerations for light-duty diesel combustion systems

Miles

Andersson

2015

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…Among them, piston bowl shape is an influential factor that characterizes fuel mixture flow and the spatial use of in-cylinder area and therefore the subject of many studies. To name some examples, Shimo et al 4 suggested a concept to reduce NOx by optimizing a re-entrant piston bowl to enhance the vertical vortex. Recently, Arato and Takashima 5 reported investigations of combustion chamber shape focusing on heat loss reduction, in which the authors optimized piston bowl shape using computational fluid dynamics (CFD) calculations combined with optimization algorithms and validated several optimized shapes by engine experiments.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous improvement of exhaust emissions and fuel consumption by optimization of combustion chamber shape of a diesel engine

Kim

Fukuda

Shimo

et al. 2017

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

In order to achieve clean exhaust gas emissions and high fuel efficiency in diesel engines, a new combustion chamber concept called ''egg-shaped piston bowl'' was proposed and its effectiveness was validated by engine experiments using a single-cylinder research engine. Numerical simulations of combustion processes and exhaust gas emissions were carried out on different piston bowl geometries using GTT-CHEM code, which is a three-dimensional computational fluid dynamics code coupled with detailed chemical kinetics. In this code, a combustion model taking account of the autoignition process of a non-homogeneous mixture and a detailed phenomenological soot model was incorporated. In the detailed phenomenological soot model, particle inception from polycyclic aromatic hydrocarbons, surface growth/oxidation and particle coagulation processes were considered. In addition, to investigate the soot formation characteristics with different piston bowl geometries, experimental measurements by the two-color method were conducted with a constant-volume vessel under high-temperature and high-pressure conditions. As a result of the engine experiments and the numerical simulations, it was confirmed that simultaneous reduction in exhaust gas emissions and fuel consumption was able to be achieved by the egg-shaped piston bowl concept.

show abstract

“…The flow in the combustion chamber largely depends on the shape of chamber. Consequently, the exhaust emission can be reduced effectively by designing the geometry of combustion chamber (1) . In this study, the combustion chamber of diesel engine is designed by using CFD analysis and optimization techniques.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Combustion Chamber for Diesel Engine Using Kriging Model

Jeong

Minemura

Obayashi

2006

JFST

View full text Add to dashboard Cite

Diesel engine combustion chamber which reduces exhaust emission has been designed using CFD analysis and optimization techniques. In order to save computational time for design, the Kriging model, one of the response surface models, is adopted here. For a robust exploration, both the estimated function value of the model and its uncertainty are considered at the same time. In the present problem, the k-means method is used to limit the number of additional sample points to a reasonable level. Among the additional sample points, two combustion chamber shapes dominate the baseline configuration in terms of all objective functions. Compared with the previous optimization with the evolutionary algorithm, its computational time for design was cut by 95%. The results indicate that the present method is a practical approach for real-world applications.

show abstract

Effect of Cooling of Burned Gas by Vertical Vortex on NOx Reduction in Small DI Diesel Engines

Cited by 5 publications

References 11 publications

A review of design considerations for light-duty diesel combustion systems

A review of design considerations for light-duty diesel combustion systems

Simultaneous improvement of exhaust emissions and fuel consumption by optimization of combustion chamber shape of a diesel engine

Optimization of Combustion Chamber for Diesel Engine Using Kriging Model

Contact Info

Product

Resources

About