Generation of combustion irreversibilities in a spark ignition engine under biogas–hydrogen mixtures fueling

Rakopoulos, C.D.; Michos, Constantine N.

doi:10.1016/j.ijhydene.2009.02.087

Cited by 98 publications

(24 citation statements)

References 28 publications

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“…These include system-level analysis, often termed exergy analysis, to obtain the net rate of exergy destruction [10][11][12][13][14][15][16][17][18][19][20][21][22][23]. More detailed studies involve identification of specific processes contributing to losses by considering the local generation of entropy.…”

Section: Introductionmentioning

confidence: 99%

Progress in the Prediction of Entropy Generation in Turbulent Reacting Flows Using Large Eddy Simulation

Safari

Hadi

Sheikhi

2014

Entropy

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An overview is presented of the recent developments in the application of large eddy simulation (LES) for prediction and analysis of local entropy generation in turbulent reacting flows. A challenging issue in such LES is subgrid-scale (SGS) modeling of filtered entropy generation terms. An effective closure strategy, recently developed, is based on the filtered density function (FDF) methodology with inclusion of entropy variations. This methodology, titled entropy FDF (En-FDF), is the main focus of this article. The En-FDF has been introduced as the joint velocity-scalar-turbulent frequency-entropy FDF and the marginal scalar-entropy FDF. Both formulations contain the chemical reaction and its entropy generation effects in closed forms. The former constitutes the most comprehensive form of the En-FDF and provides closure for all of the unclosed terms in LES transport equations. The latter is the marginal En-FDF and accounts for entropy generation effects, as well as scalar-entropy statistics. The En-FDF methodologies are described, and some of their recent predictions of entropy statistics and entropy generation in turbulent shear flows are presented.

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Section: Introductionmentioning

confidence: 99%

Progress in the Prediction of Entropy Generation in Turbulent Reacting Flows Using Large Eddy Simulation

Safari

Hadi

Sheikhi

2014

Entropy

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“…Other correlations have been examined as well (applicable over a smaller range though), with similar results. The fuel blend laminar flame speed is calculated using a Le Chatelier rule (Rakopoulos and Michos 2009), which is a rather simple calculation method, but ensures that the most reliable correlations are used for the two fuels (hydrogen and methane), taking into consideration stretch effects. The laminar flame speed is used to track the computational cells, in which the flame has propagated during the ignition phase through the calculation of the flame radius, assuming that the flame propagation velocity is approximately equal to the laminar flame speed during this phase.…”

Section: Combustion Modelmentioning

confidence: 99%

“…It is true that considerable attention has been paid in the development of alternative fuel sources, with emphasis on liquid bio-fuels that possess the added advantage of being renewable, such as vegetable oil, bio-diesel, ethanol, butanol, and diethyl ether (Agathou and Kyritsis 2014;Rakopoulos 2012Rakopoulos , 2013Wang et al 2010). Moreover, many internal combustion engines, usually converted from commercial compression-or spark-ignition engines, have been fueled with various alternative gaseous fuels, such as the most common methane (or natural gas) and liquefied petroleum gas to the most rarely syngas and biogas, for use in power generation and transportation, showing inherently clean nature of combustion with reduced emitted pollutants (Papagiannakis and Zannis 2013;Rakopoulos and Kyritsis 2006;Rakopoulos and Michos 2009). Finally, fuel blends show some interesting features, especially when hydrogen is added to a conventional fuel for combustion enhancement, due to its very high combustion speed (Kosmadakis et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Spark-Ignition Engine Fueled with Methane-Hydrogen Blends

Kosmadakis

Moreno

Arroyo

et al. 2016

Energy, Transportation and Global Warming

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“…Two strategies have been evolved to meet these challenges: the use of alternate fuels to reduce the dependence on fossil fuels [3,4] and the development of clean burning fuels to meet the strict emissions targets [5]. Owing to its superior combustion characteristics, hydrogen has received particular attention [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Performance and specific emissions contours throughout the operating range of hydrogen-fueled compression ignition engine with diesel and RME pilot fuels

Imran

Emberson

Hussain

et al. 2015

Alexandria Engineering Journal

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This paper presents the performance and emissions contours of a hydrogen dual fueled compression ignition (CI) engine with two pilot fuels (diesel and rapeseed methyl ester), and compares the performance and emissions iso-contours of diesel and rapeseed methyl ester (RME) single fueling with diesel and RME piloted hydrogen dual fueling throughout the engines operating speed and power range. The collected data have been used to produce iso-contours of thermal efficiency, volumetric efficiency, specific oxides of nitrogen (NO X ), specific hydrocarbons (HC) and specific carbon dioxide (CO 2 ) on a power-speed plane. The performance and emission maps are experimentally investigated, compared, and critically discussed. Apart from medium loads at lower and medium speeds with diesel piloted hydrogen combustion, dual fueling produced lower thermal efficiency everywhere across the map. For diesel and RME single fueling the maximum specific NO X emissions are centered at the mid speed, mid power region. Hydrogen dual fueling produced higher specific NO X with both pilot fuels as compared to their respective single fueling operations. The range, location and trends of specific NO X varied significantly when compared to single fueling . Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Please cite this article in press as: S. Imran et al., Performance and specific emissions contours throughout the operating range of hydrogen-fueled compression ignition engine with diesel and RME pilot fuels, Alexandria Eng. J. (2015), http://dx.doi.org/10.1016/j.aej.2015.05.007 cases. The volumetric efficiency is discussed in detail with the implications of manifold injection of hydrogen analyzed with the conclusions drawn. ª 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

show abstract

Generation of combustion irreversibilities in a spark ignition engine under biogas–hydrogen mixtures fueling

Cited by 98 publications

References 28 publications

Progress in the Prediction of Entropy Generation in Turbulent Reacting Flows Using Large Eddy Simulation

Progress in the Prediction of Entropy Generation in Turbulent Reacting Flows Using Large Eddy Simulation

Spark-Ignition Engine Fueled with Methane-Hydrogen Blends

Performance and specific emissions contours throughout the operating range of hydrogen-fueled compression ignition engine with diesel and RME pilot fuels

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