Numerical Investigation of Mixture Preparation in a GDI Engine

Yi, Yaxing; DeMinco, Christopher M.

doi:10.4271/2006-01-3375

Cited by 11 publications

(10 citation statements)

References 5 publications

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“…Though KH-RT breakup model was developed to predict high pressure diesel spray (Reitz, 1987), it is known that it captures some important characteristics of DISI gasoline engines (Das et al, 2009). Some studies about DISI gasoline spray through KH-RT breakup model (Malaguti et al, 2013;Montanaro et al, 2012;Yi and DeMinco, 2006) demonstrate that KH-RT breakup model can predict macroscopic DISI gasoline spray characteristics. Spray-wall interaction was predicted by model developed by Amsden, 1996, 2000).…”

Section: Computational Setupmentioning

confidence: 98%

“…It is based on the Kelvin-Helmholtz instability and Raleigh-Taylor instability. The calculated wavelength and growth rate of each model are used to predict the details of the newly-generated droplets (Yi and DeMinco, 2006). Since the RT breakup model predicts droplet disintegration much faster than the KH breakup model, the RT model is used for the breakup length.…”

Section: Spray Breakup Modelmentioning

confidence: 99%

“…There have been numerical approaches for modeling fuel-air mixing process in DISI gasoline engine. Yi and DeMinco (2006) utilized KH-RT breakup model to model gasoline spray in DISI gasoline engine. Effects of injection pressure and injection timing on equivalence ratio distribution in combustion chamber and local air-fuel ratio near spark plug were investigated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of turbulence enhancement on combustion process using a double injection strategy in direct-injection spark-ignition (DISI) gasoline engines

Kim

Song

Park

2015

International Journal of Heat and Fluid Flow

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Section: Computational Setupmentioning

confidence: 98%

Section: Spray Breakup Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of turbulence enhancement on combustion process using a double injection strategy in direct-injection spark-ignition (DISI) gasoline engines

Kim

Song

Park

2015

International Journal of Heat and Fluid Flow

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“…Within the framework, the droplet breakup is caused by the growth of competing instabilities of KH and RT [172]. The breakup due to KH instability is induced by relative velocity at the interface whereas RT instability is caused by the influence of liquid acceleration within the gas flow field [173]. Notably, KH and RT models are intrinsically inter-related, thus enhancing numerical capture capability of primary and secondary breakup processes.…”

Section: Spray Mixture Formation and Combustion Modelingmentioning

confidence: 99%

Developments in computational fluid dynamics modelling of gasoline direct injection engine combustion and soot emission with chemical kinetic modelling

Tan¹,

Bonatesta²,

Ng³

et al. 2016

Applied Thermal Engineering

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Designed to inject gasoline fuel directly into the combustion chamber, gasoline direct injection (GDI) combustion systems are gaining popularity among the automotive industry. This is because GDI engines offer less pumping and heat losses, enhanced fuel economy and improved transient response. Nonetheless, the technology is often associated with the emission of ultra-fine particulate matter (PM) to the atmosphere. With the increasingly stringent emission regulations, detailed understanding of PM formation within GDI engine configurations is very crucial. To complement the findings based on experimental and optical techniques, computational fluid dynamics (CFD) modeling has been widely utilized to study the in-cylinder physical and chemical events. The success of CFD simulations also requires an accurate representation of gasoline fuel kinetics. Set against the background, the present review reports on the recent developments in chemical kinetic modeling of gasoline fuels and CFD numerical studies for GDI engines emphasizing the combustion and emission stages. Regarding fuel kinetics, the use of primary reference fuel (PRF) and ternary reference fuel (TRF) mechanisms is evaluated. In addition, the current trend portrays a progression towards multi-component surrogate models to account for the complex mixture of practical fuels. It is however observed that many reaction mechanisms proposed in the literature are validated under homogeneous charge compression ignition (HCCI) engine conditions rather than GDI-related ones. CFD modeling of GDI engines typically covers the simulations of spray, mixture formation and combustion processes. Progress in combustion modeling for both homogeneous and stratified charge modes is discussed thoroughly. Still in its infancy, soot modeling studies for GDI engines are reviewed in which several soot models adapted are appraised. The majority of soot models have been previously applied in diesel combustion systems and flame configurations. Significant efforts are currently carried out to improve the model predictions of soot emission from GDI engines.

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“…In this area, Variable Valve Actuation (VVA) [1][2][3], Gasoline Direct Injection (GDI) [4,5], and gasoline Controlled Auto-Ignition (CAI) [6,7] have made and are continuing to make significant contributions. While recent developments of GDI technology have claimed to improve fuel consumption by up to 20% over conventional Port Fuel Injection (PFI) gasoline engines [8,9], in actual fact the GDI technology is not working independently, but rather with the aid of other new systems, such as VVA or/and CAI and/or enforced induction and other relevant technologies.…”

Section: Introductionmentioning

confidence: 99%

An Investigation into In-Cylinder Tumble Flow Characteristics with Variable Valve Lift in a Gasoline Engine

Wang

Liu

Tan

et al. 2014

Flow Turbulence Combust

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In this paper, the investigation into in-cylinder tumble flow characteristics with reduced Maximum Valve Lifts (MVL) is presented. The experimental work was conducted in a modified four-valve Spark-Ignition (SI) test engine, with optical accesses for measuring in-cylinder air motion in the vertical direction. Three different MVL of 6.8 mm, 4.0 mm and 1.7 mm were tested and Particle Image Velocimetry (PIV) was employed for those measurements. Measurement results were analysed by examining the tumble flow field, the tumble ratio variation and the fluctuating kinetic energy distribution. Meanwhile, a numerical analysis method for detecting the vortex centre was developed. From results of the vortex centre distribution, the cyclic variation of the in-cylinder flow was explored. The phase-averaged flow fields show that higher MVLs could produce stronger vertical flows which turn more toward to the piston top and finally are possible to form big scale tumble flow structure. Although lower MVLs create a higher tumble ratio when the piston is close to the Bottom Dead Centre (BDC), higher MVLs substantially produce higher tumble ratios when the piston is moving close to the Top Dead Centre (TDC). In terms of kinetic energy, lower MVLs result in higher values including higher total kinetic energy and higher fluctuating energy. Finally, the vortex centres results demonstrate lower MVLs could enhance cycle-to-cycle variation due to the weakened tumble vortex.

show abstract

Numerical Investigation of Mixture Preparation in a GDI Engine

Cited by 11 publications

References 5 publications

Effects of turbulence enhancement on combustion process using a double injection strategy in direct-injection spark-ignition (DISI) gasoline engines

Effects of turbulence enhancement on combustion process using a double injection strategy in direct-injection spark-ignition (DISI) gasoline engines

Developments in computational fluid dynamics modelling of gasoline direct injection engine combustion and soot emission with chemical kinetic modelling

An Investigation into In-Cylinder Tumble Flow Characteristics with Variable Valve Lift in a Gasoline Engine

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