E100 Stratified Lean Combustion Analysis in a Wall-Air Guided Type GDI Optical Engine

Costa, Roberto Berlini Rodrigues da; Gomes, Carlos Alberto; Franco, Rafael Lara; Guzzo, Márcio Expedito; Pujatti, Fabrício José Pacheco

doi:10.4271/2015-36-0269

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…Moreover, its higher octane rating, when compared to gasoline, allows the use of greater volumetric compression ratios [12,13], which in turn leads to an improved engine brake thermal efficiency and power output with fewer risk of knock problems [14][15][16]. Ethanol high latent heat of vaporization can also increase the density of the intake air by reducing its temperature, which improves the volumetric efficiency [17,18]. Greater research octane number due to a larger alcohol content in ethanol-gasoline blends was key to promote in-cylinder temperature control and reduce the engine auto-ignition tendency and the necessity to perform fuel enrichment at higher loads, resulting in improved thermal efficiency [19,20].…”

Section: Introductionmentioning

confidence: 99%

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

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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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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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“…There are two combustion modes in GDI engines with respect to injection timing: the homogeneous charge, i.e., early single injection at high engine loads and speeds, and stratified charge which corresponds to late single or double injection at idle, low and medium engine loads and speeds (Costa et al, 2012;Drake et al, 2007;Alkidas et al, 2003). For stratified charge, there are three approaches depending on the relative position of the injector and the way that fuel is guided to the spark plug; In wall guided strategy, the injector is side mounted and fuel is guided by the bowl shaped piston Yi et al, 2009;da Costa et al, 2015;, unlike air guided approach in which the fuel injected from the side-mounted injector is guided by the airflow (da Costa et al, 2015;Cathcart et al, 2000). On the other hand, the spray guided direct injection spark ignition (SG-DISI) strategy, in which the injector is placed nearby the spark plug (Vanderwege et al, 2003;Wang et al, 2014), is proved to have the potential to increase fuel economy especially under a stratified charge mode (Vanderwege et al, 2003;Szekely et al, 2005;Park et al, 2012).…”

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Numerical Study on the Effects of Fuel Injection Characteristics on the Performance of a Lean Burn SG-GDI Engine towards High Efficiency and Emissions Reduction

Sarmast

Ziabasharhagh

Salavati-Zadeh

et al. 2019

JAFM

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The effects of spark and injection characteristics as well as split injection on the performance and emissions of a spray-guided gasoline direct injection (SG-GDI) engine operating close to stoichiometric conditions are assessed. To accomplish this, a 6-holes injector is simulated and the results are validated against available experimental data for spray penetration length. In addition, an open-cycle multi-dimensional model is developed for a port fuel injection (PFI) engine and the model outcomes are verified against in-cylinder pressure profile and normalized heat release rate. The GDI engine model is yielded under the light of embedment of the above-mentioned models. The model is then employed for investigation of the effects of injector angle, injection pressure, start of first and second injections and two-stage fuel injection with different fuel mass ratios at first and second injections, i.e., split injection, on mixture formation, combustion and engine emissions. The results show the pivotal role of the injector angle on formation of the mixture and output power. On the other hand, it is indicated that while practicing the split injection strategy, the flammability of the relatively stratified lean mixture with fuel to air equivalence ratio of 1.15 around the spark plug, surpasses that of stratified mixture.

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A review of dual-fuel combustion mode in spark-ignition engines

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Costa

Netto

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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E100 Stratified Lean Combustion Analysis in a Wall-Air Guided Type GDI Optical Engine

Cited by 6 publications

References 11 publications

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

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

Numerical Study on the Effects of Fuel Injection Characteristics on the Performance of a Lean Burn SG-GDI Engine towards High Efficiency and Emissions Reduction

A review of dual-fuel combustion mode in spark-ignition engines

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