Mixed butanols addition to gasoline surrogates: Shock tube ignition delay time measurements and chemical kinetic modeling

AlRamadan, Abdullah S.; Badra, Jihad; Javed, Tamour; Alabbad, Mohammed; Bokhumseen, Nehal; Gaillard, Patrick; Babiker, Hassan; Farooq, Aamir; Sarathy, S. Mani

doi:10.1016/j.combustflame.2015.07.035

Cited by 43 publications

(36 citation statements)

References 41 publications

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“…Also, establishing an octane number regression model for PRFs/ethanol and TPRFs/ethanol blends would significantly aid the efforts in designing modern engines fuels with optimum ON response due to the addition of ethanol. This is achieved because detailed [38] and reduced [77] chemical kinetic models are available in literature for PRF and TPRF mixtures with ethanol, thereby enabling different types of engine simulations ranging from 0D to 3D. Note, that we recently [44] developed a molar based blending rule for predicting the ON of PRF and TPRF mixture with ethanol; however, the complexity of that model hinders it extension to development of blending rules for other multicomponent surrogates with ethanol.…”

Section: Methodology To Develop a Blending Rule Of Ethanol With Prfs mentioning

confidence: 99%

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Optimization of the octane response of gasoline/ethanol blends

2017

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Section: Methodology To Develop a Blending Rule Of Ethanol With Prfs mentioning

confidence: 99%

“…In addition, butanol isomers might also be good octane booster candidates with higher energy density compared to methanol and ethanol. We recently investigated the ignition delay times of mixed butanols/TPRF surrogates [38].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the octane response of gasoline/ethanol blends

2017

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“…One such commonly used surrogate is toluene reference fuel (TRF) comprising toluene, iso-octane and n-heptane. The suitability of TRF as a gasoline surrogate for auto-ignition applications has been demonstrated via experimental studies using shock tubes [6,10], flow reactors [11] and rapid compression machines [1]. Predicted ignition delays based on a mechanism by Mehl et al [12] were also evaluated in [1].…”

Section: Surrogate Formulationmentioning

confidence: 99%

“…The blending of oxygenates like n-butanol with gasoline, also enables more complete combustion, potentially leading to reductions in pollutant emissions such as carbon monoxide and soot [5]. Mixtures of other butanol isomers (2-butanol and tert-butanol) blended with TRF mixtures have previously been studied under shock tube conditions [6] demonstrating that at lower temperatures, these butanol isomers lengthened ignition delays of the mixtures, thus acting as octane boosters. Similar studies have not yet however been performed for n-butanol blending with gasoline, or in the lower temperature conditions of the RCM which is the aim of the current study.…”

Section: Introductionmentioning

confidence: 99%

The influence of n -butanol blending on the ignition delay times of gasoline and its surrogate at high pressures

Agbro

Tomlin

Lawes

et al. 2017

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The influence of blending n-butanol at 20% by volume on the ignition delay times for a reference gasoline was studied in a rapid compression machine (RCM) for stoichiometric fuel/air mixtures at 20 bar and 678 K-858 K. Delay times for the blend lay between those of stoichiometric gasoline and stoichiometric n-butanol across the temperature range studied. At lower temperatures, delays for the blend were however, much closer to those of n-butanol than gasoline despite n-butanol being only 20% of the mixture. Under these conditions n-butanol acted as an octane enhancer over and above what might be expected from a simple linear blending law. The ability of a gasoline surrogate, based on a toluene reference fuel (TRF), to capture the main trends of the gasoline/ n-butanol blending behaviour was also tested within the RCM. The 3-component TRF based on a mixture of toluene, n-heptane and iso-octane was able to capture the trends well across the temperature range studied. Simulations of ignition delay times were also performed using a detailed blended nbutanol/TRF mechanism based on the adiabatic core assumption and volume histories from the experimental data. Overall, the model captured the main features of the blending behaviour, although at the lowest temperatures, predicted ignition delays for stoichiometric n-butanol were longer than those observed. A bruteforce local sensitivity analysis was performed to evaluate the main chemical processes driving the ignition behaviour of the TRF, n-butanol and blended fuels. The reactions of fuel + OH dominated the sensitivities at lower temperatures, with H abstraction from nn-butanol and the blend. At higher temperatures the decomposition of H 2 O 2 and reactions of HO 2 and that of formaldehyde with OH became critical, in common with the ignition behaviour of other fuels. Remaining uncertainties in the rates of these key reactions are discussed.

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“…The presence of the OH molecule in ethanol combination causes an increase in the amount of oxygen in the mixture and reduces the pollutants of CO, HC, PM, and caused a limited increase in NOx [8]. Bioethanol has a high latent heat of vaporization, which caused a decrease of the temperature of the air-fuel charge, leading to delay the self-ignition [9]. The high octane number of the mixture means burning without a knock, and then the compression ratio of the engine that works with this Bashar A. Mohammed is currently Assistant lecturer in University of Technology, Baghdad-IRAQ.…”

Section: Introductionmentioning

confidence: 99%

Study the performance and emissions of a spark ignition engine works with ethanol and petrol mixture

Mohammed¹

2016

IJOCAAS

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Mixed butanols addition to gasoline surrogates: Shock tube ignition delay time measurements and chemical kinetic modeling

Cited by 43 publications

References 41 publications

Optimization of the octane response of gasoline/ethanol blends

Optimization of the octane response of gasoline/ethanol blends

The influence of n -butanol blending on the ignition delay times of gasoline and its surrogate at high pressures

Study the performance and emissions of a spark ignition engine works with ethanol and petrol mixture

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