Insights relating to the autoignition characteristics of alcohol fuels

Yates, Andy; Bell, Arthur; Swarts, André

doi:10.1016/j.fuel.2009.06.037

Cited by 94 publications

(50 citation statements)

References 9 publications

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“…Yates et al [4], [14] proposed an empirical model concept with a formfitting simplification of the overall ignition delay into four basic steps. These comprised (a) a pre-cool-flame delay at constant temperature, (b) an instantaneous cool-flame temperature increase (which could be zero), (c) a further delay at constant temperature, and (d) the terminal exothermic auto-ignition.…”

Section: The Model Of Yates Et Almentioning

confidence: 99%

“…For light alcohols and methanol, in particular, a number of correlations were proposed over the years based on shock tube experiments [16,17], rapid compression machine (RCM) tests [18] and chemical kinetics calculations [4].…”

Section: Autoignition Correlation For Alcoholsmentioning

confidence: 99%

“…In this study, we used the empirical model of Yates et al [4] to calculate the ignition delays of blends of primary reference fuels and methanol to investigate if a simple mixing rule could be applied to calculate the ignition delays of alcohol-hydrocarbon blends. Over 1500 detailed chemical kinetic simulations were used to calibrate the model of Yates el al.…”

Section: Autoignition Correlation For Alcohol-blendsmentioning

confidence: 99%

“…Alcohol fuels have a high knock tolerance for a variety of reasons. First and foremost methanol and ethanol have an elevated chemical resistance to autoignition, which is reflected in their high octane number (ON= 109) [4]. This is due to the single-stage autoignition behavior of alcohols.…”

Section: Introductionmentioning

confidence: 99%

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A quasi-dimensional model for SI engines fueled with gasoline–alcohol blends: Knock modeling

Sileghem

Wallner

Verhelst

2015

Fuel

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As knock is one of the main factors limiting the efficiency of spark-ignition engines, the introduction of alcohol blends could help to mitigate knock concerns due to the elevated knock resistance of these blends. A model that can accurately predict their autoignition behavior would be of great value to engine designers. The current work aims to develop such a model for alcohol-gasoline blends. First, a mixing rule for the autoignition delay time of alcohol-gasoline blends is proposed. Subsequently, this mixing rule is used together with an autoignition delay time correlation of gasoline and an autoignition delay time correlation of methanol in a knock integral model that is implemented in a two-zone engine code. The predictive performance of the resulting model is validated through comparison against experimental measurements on a CFR engine for a range of gasoline-methanol blends.The knock limited spark advance, the knock intensity, the knock onset crank angle and the value of the knock integral at the experimental knock onset have been simulated and compared to the experimental values derived from in-cylinder pressure measurements.

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Section: The Model Of Yates Et Almentioning

confidence: 99%

Section: Autoignition Correlation For Alcoholsmentioning

confidence: 99%

Section: Autoignition Correlation For Alcohol-blendsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A quasi-dimensional model for SI engines fueled with gasoline–alcohol blends: Knock modeling

Sileghem

Wallner

Verhelst

2015

Fuel

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“…They offer the potential of CO 2 neutral transport and increased energy security, while ameliorating engine performance and efficiency compared to fossil fuels thanks to a number of interesting properties [5,6]. The most significant interesting properties of light alcohols include: 35 • High heat of vaporization, which causes considerable charge cooling as the injected fuel evaporates.…”

Section: Light Alcohols As Si Engine Fuelsmentioning

confidence: 99%

Development and validation of a quasi-dimensional model for methanol and ethanol fueled SI engines

2014

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Methanol and ethanol are promising alternative SI engine fuels. Engine simulation tools could help to unlock the full potential of these fuels. Previous work by the current authors has focused on building submodels to predict the gas dynamics, combustion and knock occurrence in alcohol engines. Here, 10 these building blocks are implemented in a quasi-dimensional engine simulation code, which is subsequently validated against measurements on two engines for various working conditions. The power cycle predictions for varying mixture composition are significantly improved by the introduction of new laminar burning velocity correlations. A comparison of turbulent combustion 15 models indicates that models including thermodiffusive properties perform slightly better than simpler formulations. Finally, a preliminary evaluation of a new knock prediction model for methanol engines confirms useful results can be obtained for quantities relevant to knock. The largest inaccuracies occur for varying equivalence ratios. Including the effects of methanol on 20 evaporation cooling and wall heat transfer might resolve this. The higher heat of vaporization relative to gasoline also required the inclusion of fuel puddling dynamics for a correct prediction of the volumetric efficiency by the breathing cycle model.

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Experimental study of the macroscopic characteristics of methanol low‐pressure injection spray

Chen²,

Su³

et al. 2022

Intl J of Energy Research

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This study aims to examine the effects of ambient pressure, fuel temperature, and ambient temperature on the macroscopic characteristics of a methanol low-pressure spray. Backlight imaging and high-speed photography are used to record spray morphology. The experimental conditions include the normal, transitional, and strong flash-boiling states. The flash-boiling state significantly increases the spray penetration and angle. The plumes of the strong flashboiling spray shrink along the injector axis into a long, narrow liquid beam, and the spray morphology is similar to that of a shuttle. The flash-boiling spray yields different performance at various ambient temperatures despite constant fuel superheat, which indicates that the flash-boiling state is affected by both the fuel superheat and ambient temperature. Moreover, the influence mechanism is examined. A high ambient temperature increases the likelihood and severity of bubble burst. By contrast, a low ambient temperature hinders bubble expansion and bursting, reducing the flash-boiling intensity. Furthermore, a dimensionless analysis of the non-flash-boiling spray velocity is performed, and the correlation between the non-flash-boiling spray velocity and air-fuel density ratio, Weber number, and Reynolds number is established. The deviation of the predictive value from the correlation and measured value is within ±5%. The results indicate that the Reynolds number has a less significant effect than the air-fuel density ratio and Weber number.

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Insights relating to the autoignition characteristics of alcohol fuels

Cited by 94 publications

References 9 publications

A quasi-dimensional model for SI engines fueled with gasoline–alcohol blends: Knock modeling

A quasi-dimensional model for SI engines fueled with gasoline–alcohol blends: Knock modeling

Development and validation of a quasi-dimensional model for methanol and ethanol fueled SI engines

Experimental study of the macroscopic characteristics of methanol low‐pressure injection spray

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