Simulation of Autoignition, Knock and Combustion for Methane-Based Fuels

Urban, Lukas; Grill, Michael; Hann, Sebastian; Bargende, Michael

doi:10.4271/2017-01-2186

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…The widely used Douaud and Eyzat 27 correlation for ignition delay was not used because of the lack of applicability in relation to fuels with a high octane number. The model used in this study is given by Urban et al 28 and is based on chemical kinetic simulations for specifically NG/air mixtures and is validated against experiment…”

Section: Detailed Engine Modelmentioning

confidence: 99%

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The fundamental effects of in-cylinder evaporation of liquefied natural gas fuels in engines

Finneran

Garner

Nadal

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Liquefied natural gas is emerging as viable and potentially sustainable transportation fuel with intrinsic economic and environmental benefits. Liquefied natural gas possesses thermomechanical exergy amounting to ∼1 MJ kg-1 which is currently wasted on liquefied natural gas vehicles, while it could be used to produce useful work. The present investigation proposes an indirect means of obtaining useful work from liquefied natural gas through charge cooling and also demonstrates additional benefits in terms of NOx emissions and power density. A thermodynamic engine model was used to quantify the performance benefits of such a strategy for a homogeneous-charge, spark-ignited, stoichiometric natural gas engine. Four fuelling strategies were compared in terms of fuel consumption, mean effective pressure and NOx emissions. Compared to the conventional port-injected natural gas engine (where gaseous fuel is injected), it was found that directly injecting the liquid phase fuel into the cylinder near the start of the compression stroke resulted in approximately -8.9% brake specific fuel consumption, +18.5% brake mean effective pressure and -51% brake specific NOx depending on the operating point. Port-injection of the fuel in the liquid phase carried similar benefits, while direct injection of the fuel in the gaseous phase resulted in minor efficiency penalties (∼+1.3% brake specific fuel consumption). This work highlights the future potential of liquefied natural gas vehicles to achieve high specific power, high efficiency and ultra-low emissions (such as NOx) by tailoring the fuel system to fully exploit the cryogenic properties of the fuel.

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Section: Detailed Engine Modelmentioning

confidence: 99%

“…The reader is referred to the original article for the calculation details. 28 It is well known that the presence of longer chain hydrocarbons increases susceptibility to knock, as generally quantified by a reduction in methane number (MN) of the fuel. This reduction in MN is a consequence of a reduced ignition delay.…”

Section: Detailed Engine Modelmentioning

confidence: 99%