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

Kim, Tae-Hoon; Song, Jingeun; Park, Sungwook

doi:10.1016/j.ijheatfluidflow.2015.07.013

Cited by 77 publications

(30 citation statements)

References 34 publications

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“…12 of 19 [47,48]. Nonetheless, the net difference recorded between the two fuels suggests that mixture stratification plays the most significant role.…”

Section: Resultsmentioning

confidence: 98%

“…This can be explained through two different mechanisms. One is that the organized fluid motion is quickly converted into turbulence around TDC [46]; the other is that the interaction with the six fuel jets can induce other velocity components that can even partially cancel out tumble [47,48]. Nonetheless, the net difference recorded between the two fuels suggests that mixture stratification plays the most significant role.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol

et al. 2017

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Within the context of ever wider expansion of direct injection in spark ignition engines, this investigation was aimed at improved understanding of the correlation between fuel injection strategy and emission of nanoparticles. Measurements performed on a wall guided engine allowed identifying the mechanisms involved in the formation of carbonaceous structures during combustion and their evolution in the exhaust line. In-cylinder pressure was recorded in combination with cycle-resolved flame imaging, gaseous emissions and particle size distribution. This complete characterization was performed at three injection phasing settings, with butanol and commercial gasoline. Optical accessibility from below the combustion chamber allowed visualization of diffusive flames induced by fuel deposits; these localized phenomena were correlated to observed changes in engine performance and pollutant species. With gasoline fueling, minor modifications were observed with respect to combustion parameters, when varying the start of injection. The alcohol, on the other hand, featured marked sensitivity to the fuel delivery strategy. Even though the start of injection was varied in a relatively narrow crank angle range during the intake stroke, significant differences were recorded, especially in the values of particle emissions. This was correlated to the fuel jet-wall interactions; the analysis of diffusive flames, their location and size confirmed the importance of liquid film formation in direct injection engines, especially at medium and high load.

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“…12 of 19 [47,48]. Nonetheless, the net difference recorded between the two fuels suggests that mixture stratification plays the most significant role.…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol

et al. 2017

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“…Nonetheless, more complex spray models are utilized to yield a more accurate description of the entire spray phenomenon. One such model is the KH-RT model which has been increasingly adapted in GDI engine simulations [129], [139], [141]. Huang and Lipatnikov [172] compared liquid penetration and SMD of gasoline and ethanol sprays predicted by various spray models which were implemented in an open source code called OpenFOAM.…”

Section: Spray Mixture Formation and Combustion Modelingmentioning

confidence: 99%

“…Reasonable agreement between simulations and experiments was seen for flame propagation, flame durations and emissions of NO and UHC. The primary interest of Kim et al's work [141] was to examine the feasibility of a double injection strategy in GDI engines through 3D combustion modeling using G-equation model. It was shown that a first injection mid-way through the intake stroke, followed by an early second injection in the compression stroke enabled improved turbulence intensity, while maintaining the in-cylinder mixture homogeneity globally.…”

Section: Spray Mixture Formation and Combustion Modelingmentioning

confidence: 99%

“…Recent computational studies on combustion within GDI engine configurations have incorporated reduced chemical kinetic mechanisms to better represent the chemistry of gasoline fuels in computing the laminar flame speeds. Nonetheless, the mechanisms applied are restricted to those of single component iso-octane [132], [138], [141] and binary blends of PRF [120], [134], [137]. Hence, complex reaction mechanisms with multiple fuel components should be merged with combustion modeling works in GDI engines while significant efforts need to be directed at improving the current predictive capability of combustion models across a wide range of operating conditions.…”

Section: Spray Mixture Formation and Combustion Modelingmentioning

confidence: 99%

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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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Split Injection Strategy Optimization to Achieve Ideal Stratified‐Charge Mixture and Reinforce Ultralean Burn in a High Compression Ratio Direct Injection Spark Ignition Engine

Liu

Zheng

2022

Energy Tech

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Ultralean burn is considered an effective way to enhance the thermal efficiency of direct injection spark ignition engines. Herein, under ultralean burn condition, the split injection strategy is induced to investigate the in‐cylinder mixture distribution, combustion characteristics, and emissions by simulation in a high compression ratio engine model. First, the homogeneity index shows that compared with the single injection method, the split injection strategy shows better stratification of the mixture gas at the early stage of the compression stroke, which results in higher in‐cylinder pressure and heat release. Meanwhile, the results of heat balance show that split injection shows a slight effect on ignition delay, but significantly shortens combustion duration and advances CA50, and thus the exhaust loss is decreased. Second, with the decrease of a second injection fuel mass, the rich mixture is formed near the spark plug, thus reducing the ignition delay and combustion duration. Third, the split injection strategy presents faster flame kernel growth and propagation. A larger flame area is observed with the second injection mass decreasing. Finally, as the second fuel injection mass is reduced, NOx emissions increases continuously, while the soot emission decreases.

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

Cited by 77 publications

References 34 publications

Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol

Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol

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

Split Injection Strategy Optimization to Achieve Ideal Stratified‐Charge Mixture and Reinforce Ultralean Burn in a High Compression Ratio Direct Injection Spark Ignition Engine

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