Effect of Ethanol Ratio on Ignition and Combustion of Ethanol-Gasoline Blend Spray in DISI Engine-Like Condition

Chen, Run; Okazumi, Ryoma; Nishida, Keiya; Ogata, Youichi

doi:10.4271/2015-01-0774

Cited by 15 publications

(5 citation statements)

References 46 publications

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“…Developing Time (FDT), Flame Rising Time (FRT), and Laminar Burning Velocity (S L ). For successful flame development, FDT and FRT effectively represent the physicochemical properties of fuel/air mixtures [10,[43][44][45].…”

Section: Flamementioning

confidence: 99%

Experimental Study of Explosion Characteristics and General Correlations of Lean H2/CO/CH4/Air Mixtures in Quiescence

Nguyen

et al. 2023

International Journal of Energy Research

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A comprehensive understanding of the combustion characteristics of complex and changeable synthesis gas (syngas) compositions is essential for the further development of syngas-fueled engines with high thermal efficiency and low emissions. This study investigated explosion duration properties and laminar burning velocity ( S L ) of multicomponent syngas/air using the pressure-rise method. The lean multicomponent syngas/air mixtures at various equivalence ratios ( ϕ = 0.6 , 0.7, and 0.8) containing different volumetric fractions of H2 (10–30%), CO (10–30%), and CH4 (40–60%) were conducted in a cylindrical constant volume combustion chamber using a dual-coil car ignition system. The explosion duration was characterized by the flame development time (FDT) and flame rising time (FRT), where FDT (FRT) is the time between spark ignition and 10% (10% and 90%) of the total heat release. The results showed that the values of FDT were approximately twofold of the FRT values, and they decreased with increasing H2 or CO content in the mixture. The leaner the mixture, the faster would be the reduction in the FRT and FDT as increasing H2 and/or CO content. Moreover, FDT and FRT were the shortest at a (H2/(H2+CO)) ratio of 0.5, at which the CH4 content was the lowest. Beyond this ratio, FDT and FRT increased, suggesting a significant effect of CH4 concentration. The shorter the FRT value, the higher would be the S L value. The current S L values, together with previous syngas data, could be well represented by a modified correlation with a slight discrepancy. This suggests a possible self-similar propagation of syngas/air laminar flames, regardless of the equivalence ratio, constituent fraction, temperature, pressure, and dilution. Additionally, a small value of mean absolute percentage error (~10.8%) revealed a better correlation for predicting S L values of syngas fuels.

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Section: Flamementioning

confidence: 99%

Experimental Study of Explosion Characteristics and General Correlations of Lean H2/CO/CH4/Air Mixtures in Quiescence

Nguyen

et al. 2023

International Journal of Energy Research

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“…For successful flame development, t delay offers an effective way to evaluate the physicochemical property of a combustible fuel−air mixture [25,[35][36][37]. T delay is defined as the time duration from the start ignition command to 10% of the total normalized cumulative heat release (NCHR) in which t delay could be affected by E ig .…”

Section: Ignition Delay Time (T Delay ) and Flame Rising Time (T Risi...mentioning

confidence: 99%

Effect of Ignition Energy and Hydrogen Addition on Laminar Flame Speed, Ignition Delay Time, and Flame Rising Time of Lean Methane/Air Mixtures

et al. 2022

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A series of experiments were performed to investigate the effect of ignition energy (Eig) and hydrogen addition on the laminar burning velocity (Su0), ignition delay time (tdelay), and flame rising time (trising) of lean methane−air mixtures. The mixtures at three different equivalence ratios (ϕ) of 0.6, 0.7, and 0.8 with varying hydrogen volume fractions from 0 to 50% were centrally ignited in a constant volume combustion chamber by a pair of pin-to-pin electrodes at a spark gap of 2.0 mm. In situ ignition energy (Eig ∼2.4 mJ ÷ 58 mJ) was calculated by integration of the product of current and voltage between positive and negative electrodes. The result revealed that the Su0 value increases non-linearly with increasing hydrogen fraction at three equivalence ratios of 0.6, 0.7, and 0.8, by which the increasing slope of Su0 changes from gradual to drastic when the hydrogen fraction is greater than 20%. tdelay and trising decrease quickly with increasing hydrogen fraction; however, trising drops faster than tdelay at ϕ = 0.6 and 0.7, and the reverse is true at ϕ = 0.8. Furthermore, tdelay transition is observed when Eig > Eig,critical, by which tdelay drastically drops in the pre-transition and gradually decreases in the post-transition. These results may be relevant to spark ignition engines operated under lean-burn conditions.

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“…It is very important today with its features [2]. Due to these properties, the performance and emission studies of bioethanol fuel used in engines are intensively carried out by many researchers [3][4][5][6][7]. Some investigations emphasized that the low calorific value and cetane number of bioethanol fuel compared to diesel fuel are quite effective on engine performance [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effects on ring wear of bioethanol/diesel fuel blends used at long term endurance tests in a DI engine

Temizer

GÜCER

2022

International Journal of Automotive Engineering and Technologies

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In this study, the long-term endurance tests were carried out in a diesel engine that used diesel and 90% diesel + 10% bioethanol fuels. The spray and temperature distributions of two different fuels in the AVL FIRE program also were examined. Tribological and morphological analysis of piston rings were investigated in a single-cylinder direct injection diesel engine using two different fuel types. The test engine used two different fuel types and was operated for approximately 110 hours under part engine load. Renewed rings in each fuelled engine operation were analyzed at Energy Dispersive X-ray Spectroscopy (EDX) and Scanning Electron Microscope (SEM). Results were also compared with the non-worked piston ring. Analysis results saw that abrasive wear was more intense on the first rings at both fuel types. Examining the effect of biofuels on engine wears, short wear lines were found at engine rings using diesel/bioethanol blend fuel compared to diesel fuel. It was being determined that this situation was a result of combustion parameters (such as pressure, and temperature) created with the different fuels used in diesel engines. As a result, that bioethanol has a content of low carbon (C) compared to diesel fuel, making a positive contribution to the reduction of ring wear.

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Effect of Ethanol Ratio on Ignition and Combustion of Ethanol-Gasoline Blend Spray in DISI Engine-Like Condition

Cited by 15 publications

References 46 publications

Experimental Study of Explosion Characteristics and General Correlations of Lean H2/CO/CH4/Air Mixtures in Quiescence

Experimental Study of Explosion Characteristics and General Correlations of Lean H2/CO/CH4/Air Mixtures in Quiescence

Effect of Ignition Energy and Hydrogen Addition on Laminar Flame Speed, Ignition Delay Time, and Flame Rising Time of Lean Methane/Air Mixtures

Effects on ring wear of bioethanol/diesel fuel blends used at long term endurance tests in a DI engine

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