Effect of injection timing on mixture formation and combustion in an ethanol direct injection plus gasoline port injection (EDI+GPI) engine

Huang, Yuhan; Hong, Guang; Huang, Ronghua

doi:10.1016/j.energy.2016.05.109

Cited by 56 publications

(25 citation statements)

References 52 publications

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“…Thus, for the SOI case of -35 °CA ATDC, the generated Swirl -is totally offset at ST, and only one-way flame propagation along Swirl + is observed, which is different from the two-direction flame propagation in Cases A and B with retarded SOI. [18,32]. When SOI is at -25 °CA ATDC, the fuel mass fraction around the chamber center at ST is high as seen in Fig.…”

Section: Fig 7 Standard Deviation Of In-cylinder Equivalence Ratio (mentioning

confidence: 89%

Investigation on a high-stratified direct injection spark ignition (DISI) engine fueled with methanol under a high compression ratio

Bai

Tunér

et al. 2019

Applied Thermal Engineering

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This paper reports an investigation of a highly stratified methanol direct injection spark ignition (DISI) engine with a high compression ratio. The effects of the start of injection (SOI), spray-included angle, injection pressure, and spark timing (ST) on in-cylinder flow, fuel distribution, flame propagation, and engine performance are evaluated in detail. The combustion process of methanol DISI engine is very sensitive to the variation of SOI, which is closely associated with the in-cylinder turbulence and the fuel/air mixing. It is found that retarding SOI shows the similar effects on combustion process as reducing spray-included angle, which indicates that the effects of SOI are more related to the spray target (i.e., fuel distribution). The injection pressure affects the combustion process mainly through the impact on the fuel distribution in the cylinder. The flame propagates from the spark plug towards the cylinder axis along the in-cylinder swirl direction, and more fuel mass in the piston bowl promotes the flame propagation. Thus, more retarded SOI, smaller spray-included angle, and lower injection pressure are suggested at low loads to enrich the fuel concentration in the bowl to achieve a stable combustion. Under medium load, indicated thermal efficiency (ITE), peak pressure rise rate (PPRR), and nitrogen oxides (NOx) emissions can be improved with advanced SOI. ITE can also be improved by advancing ST with a slight penalty on PPRR and NOx. This study demonstrates the potential of simultaneously optimizing fuel injection and ST to improve engine performance.

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Section: Fig 7 Standard Deviation Of In-cylinder Equivalence Ratio (mentioning

confidence: 89%

Investigation on a high-stratified direct injection spark ignition (DISI) engine fueled with methanol under a high compression ratio

Bai

Tunér

et al. 2019

Applied Thermal Engineering

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“…Changing the ethanol percentage in the fuel will affect the thermo-physical properties of the fuel blend with positive impacts on combustion and some emissions [14,15]. The effects of adding ethanol to gasoline fuel on engine performance and combustion characteristics have been investigated in the literature [2,[16][17][18][19]. Adding ethanol to fuel can increase the mixed fuel octane number.…”

Section: Introductionmentioning

confidence: 99%

“…According to their result, retarding the start of combustion can improve the combustion efficiency. Huang et al [17] conducted an experimental study in which the impacts of ethanol injection timing for an engine with an ethanol direct injection system was investigated. In this study, the ethanol was injected directly into the combustion chamber in a gasoline engine with a port fuel injection (PFI) system.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Port Water Injection on Spark Ignition Engine Performance and Emissions Fueled by Pure Gasoline, E5 and E10

et al. 2020

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It has been proven that vehicle emissions such as oxides of nitrogen (NOx) are negatively affecting the health of human beings as well as the environment. In addition, it was recently highlighted that air pollution may result in people being more vulnerable to the deadly COVID-19 virus. The use of biofuels such as E5 and E10 as alternatives of gasoline fuel have been recommended by different researchers. In this paper, the impacts of port injection of water to a spark ignition engine fueled by gasoline, E5 and E10 on its performance and NOx production have been investigated. The experimental work was undertaken using a KIA Cerato engine and the results were used to validate an AVL BOOST model. To develop the numerical analysis, design of experiment (DOE) method was employed. The results showed that by increasing the ethanol fraction in gasoline/ethanol blend, the brake specific fuel consumption (BSFC) improved between 2.3% and 4.5%. However, the level of NOx increased between 22% to 48%. With port injection of water up to 8%, there was up to 1% increase in engine power whereas NOx and BSFC were reduced by 8% and 1%, respectively. The impacts of simultaneous changing of the start of combustion (SOC) and water injection rate on engine power and NOx production was also investigated. It was found that the NOx concentration is very sensitive to SOC variation.

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“…The independence of ethyl alcohol from fossil fuels [7] and the reduction in greenhouse gaseous (GHG) emissions are important factors for the growth of its use as a clean source of energy [8][9][10]. As it is extracted from a vegetable base, it theoretically does not influence the carbon cycle, once the plants used for the fuel production absorb the CO 2 emitted by the burning of ethanol [11].…”

Section: Introductionmentioning

confidence: 99%

An evaluation of combustion aspects with different compression ratios, fuel types and injection systems in a single-cylinder research engine

Malaquias

Netto

Costa

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The growing commercialization of flex-fuel vehicles in Brazil demands the optimization of internal combustion engines for the operation with ethanol (E100) and gasohol (E22), in an attempt to reduce the fuel consumption and minimize the pollutant emissions into the atmosphere. In this sense, this work proposes the study of different volumetric compression ratios in a single-cylinder research engine in order to conclude about its fuel conversion efficiency and, in particular, a more detailed combustion investigation for two of the most common Brazilian fuels. Dynamometric bench tests were performed for distinct compression ratios, injection systems and fuel types, which demanded a specific piston design to meet the requirements for each combustion chamber configuration. The use of ethanol was the most suitable when compared to gasohol, especially at high load conditions, in which was observed a knock tendency for E22 but not for E100, due to its improved physicochemical properties, resulting in enhanced combustion aspects. The proposed methodology proved effective in allowing fuel conversion efficiency gains for the tested fuels, injection systems and piston designs when compared to the engine baseline operation, with up to 6.1% improvement when using the most appropriate compression ratio. Finally, the ethanol direct injection confirmed the potential of this Brazilian biofuel as one of the most promising renewable options for internal combustion engines in current and future sustainable energy directives. Keywords Compression ratio • Internal combustion engine • Fuel conversion efficiency • Ethanol • Flex-fuel Abbreviations ABDC After bottom dead center APMAX Angle of maximum pressure (°) ATDC After top dead center BBDC Before bottom dead center BMEP Brake mean effective pressure (bar) BTDC Before top dead center CA Crank angle CO 2 Carbon dioxide COV Covariance (%) CR Compression ratio DI Direct injection E100

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Effect of injection timing on mixture formation and combustion in an ethanol direct injection plus gasoline port injection (EDI+GPI) engine

Cited by 56 publications

References 52 publications

Investigation on a high-stratified direct injection spark ignition (DISI) engine fueled with methanol under a high compression ratio

Investigation on a high-stratified direct injection spark ignition (DISI) engine fueled with methanol under a high compression ratio

The Effects of Port Water Injection on Spark Ignition Engine Performance and Emissions Fueled by Pure Gasoline, E5 and E10

An evaluation of combustion aspects with different compression ratios, fuel types and injection systems in a single-cylinder research engine

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