Effect of di-n-butyl ether blending with soybean-biodiesel on the near-nozzle spray characteristics

Tang, Chenglong; Guan, Li; Feng, Zehao; Zhan, Cheng; Yang, Ke; Huang, Zuohua

doi:10.1016/j.fuel.2016.11.099

Cited by 23 publications

(9 citation statements)

References 18 publications

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“…Since biodiesel commonly exhibits even worse spray characteristics than conventional diesel, the addition of DNBE to biodiesel has thus been investigated by a number of studies as a means to improve biodiesel atomization and thus fuel/air mixing. Similarly to its addition to diesel, lower spray penetration lengths and larger spray angles were observed in these cases for the biodiesel/DNBE blends compared with pure biodiesel. ,, In particular, Guan et al found that at 30 vol % DNBE blending with biodiesel, the resulting spray characteristics were comparable with those of conventional diesel, as shown in Figure in terms of the spray projected area. The improved atomization behavior of DNBE has been considered as one reason for the reduced levels of soot emissions, which were observed in both a high-pressure chamber and engine tests, ,, despite the fact that DNBE exhibits a significantly higher cetane number and thus reduced ignition delay times in which fuel/air mixing is possible.…”

Section: Fuel Production Properties and Applicationmentioning

confidence: 87%

Higher Alcohol and Ether Biofuels for Compression-Ignition Engine Application: A Review with Emphasis on Combustion Kinetics

2021

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High molecular weight alcohol and ether fuels with their advanced autoignition propensities and oxygenated molecular structures are promising future fuel candidates for compression-ignition engine application, because they can provide improved combustion efficiencies and reduced pollutant emissions. In addition, their production from lignocellulosic biomass as second-generation biofuels offers an improved CO2 balance and avoids the adverse impact of the first-generation biofuel production on the food supply. This review aims to summarize the recent research progress on the combustion of long-chain alcohols and ethers with more than four carbon atoms, putting a particular emphasis on their fundamental combustion kinetics. The article starts with aspects related to their production routes, physical and chemical properties, and practical applications, highlighting the resulting consequences for their potentials as renewable fuels in comparison with conventional diesel fuels. This is followed by a comprehensive evaluation of their fundamental ignition and combustion characteristics. The existing chemical mechanisms for the oxidation of higher alcohols and ethers are introduced in conjunction with discussions of their development approaches. Their reaction kinetics are further explored to understand the dependence of their combustion behaviors on the molecule’s structural features, such as functional groups and carbon chain length. In particular, the different influences of the molecule size on the cetane numbers of longer alcohols and ethers are analyzed. The review finishes with a discussion suggesting directions for future experimental and numerical investigations, which will allow deepening of the understanding of the combustion kinetics of higher alcohol and ether fuels.

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Section: Fuel Production Properties and Applicationmentioning

confidence: 87%

Higher Alcohol and Ether Biofuels for Compression-Ignition Engine Application: A Review with Emphasis on Combustion Kinetics

2021

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“…The use of DBE as a fuel additive has been shown to decrease soot emissions from diesel engines [2,3,5]. While DBE has been extensively examined under engine conditions [2][3][4][5]9,10], the fundamental oxidation chemistry of this fuel is not similarly well investigated. Recent studies address the high temperature (HT) oxidation of DBE, including the measurements of ignition delay times in a shock tube [11], premixed laminar flame speeds [12], and gaseous species [13] or soot particles [14] in flames.…”

Section: Introductionmentioning

confidence: 99%

Probing the low-temperature chemistry of di-n-butyl ether: Detection of previously unobserved intermediates

Tran

Wullenkord

et al. 2019

Combustion and Flame

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Din -butyl ether (DBE, C8H18O) has been proposed as a promising biofuel for diesel engines, but details of its low-temperature (LT) oxidation chemistry are not well understood. This paper reports new speciation data obtained in the temperature range of 400-1100 K at ϕ=1 and nearly-atmospheric pressure, using a plug flow reactor (PFR) combined with electron ionization (EI) molecular-beam mass spectrometry (MBMS) and two different jet-stirred reactors (JSRs) coupled with either online gas chromatography (GC) or tunable synchrotron vacuum ultraviolet (SVUV) photoionization (PI)-MBMS. The experimental results confirm that DBE is very reactive and exhibits two negativetemperature coefficient (NTC) zones around 500-550 K and 650-750 K. Speciation data with about 40 C0-C8 species are presented, including about 20 LT species not reported previously. Among those, fuel-specific C8H16O2 cyclic ethers were quantified. Also, butanoic acid, which is present in highest amounts among the detected LT intermediates, and C8H14O3 diones, were found to peak already near 500 K, suggesting their importance in the LT chemistry of DBE. Signals of several highly oxygenated peroxides (e.g., C8H14O5 and C8H16O6) were detected, indicating third O2 addition steps. Respective reaction pathways are suggested and discussed based on these experimental results. To better understand the LT chemistry of DBE, the present data were compared to two recent DBE models [L. Cai et al. Combust. Flame. 161 (2014) 798-809 and S. Thion et al. Combust. Flame 185 (2017) 4-15]. Significant discrepancies between the experimental data and both models were found for important LT intermediates, of which many were not included in the respective mechanisms. The results reported in the present study thus provide new opportunities for refining DBE kinetic models.

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“…of DBE into biofuels with DBE15 and DBE30 respectively, result in reduced penetration, also increased spray cone angle and maximum spray width. In another study from Tang et al (Tang et al, 2017), the experimental results were also similar, with 30% DBE blended with 70% biodiesel, the viscosity and density of the blended fuel decreased, increasing the angle it sprays and the spray area (Hoang, 2019).…”

Section: Properties Of Ether Additivesmentioning

confidence: 57%

Performance and Emission Characteristics of Diesel Engine Using Ether Additives: A Review

Doan

Nguyen

Pham

et al. 2021

Int. J. Renew. Energy Dev.

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Pressure on alternative fuels and strict environmental regulations are driving a strategic shift in the efficient use of renewable biofuels. One of the promising biofuel candidates recently interested by scholars is a biological or organic additive that is added into diesel or biodiesel fuel to improve engine performance and reduce pollutant emissions. With efforts to improve efficiency and combustion quality in cylinders, combustion characteristics, flame structure and emission formation mechanism in compression ignition (CI) engines using blended fuel with organic additives have been studied on the effect of additive properties on the combustion behaviour. In this review, the physicochemical properties of typical organic additives such as ethers compounds and their effects on engine performance and emission characteristics have been discussed and evaluated based on conclusions of recent relevant literature. The results of the analysis revealed the prospect of using ether additives to improve combustion in cylinders and reduce pollutant emissions from CI engines. Obviously, the presence of higher oxygen content, lower viscosity and density, and higher cetane number resulted in a positive change in the combustion dynamics as well as a chain of mechanisms for the formation of pollutant precursors in the cylinder. Therefore, ether additives have a significant contribution to the sustainable energy strategy of the transportation sector in the next period when internal combustion engines still dominate in the competition for energy system choices equipped on vehicles.

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Effect of di-n-butyl ether blending with soybean-biodiesel on the near-nozzle spray characteristics

Cited by 23 publications

References 18 publications

Higher Alcohol and Ether Biofuels for Compression-Ignition Engine Application: A Review with Emphasis on Combustion Kinetics

Higher Alcohol and Ether Biofuels for Compression-Ignition Engine Application: A Review with Emphasis on Combustion Kinetics

Probing the low-temperature chemistry of di-n-butyl ether: Detection of previously unobserved intermediates

Performance and Emission Characteristics of Diesel Engine Using Ether Additives: A Review

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