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

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dc.contributor.author Rakopoulos, CD en
dc.contributor.author Michos, CN en
dc.date.accessioned 2014-03-01T01:30:48Z
dc.date.available 2014-03-01T01:30:48Z
dc.date.issued 2009 en
dc.identifier.issn 0360-3199 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/19632
dc.subject Hydrogen en
dc.subject Biogas en
dc.subject Spark ignition engine en
dc.subject Availability analysis en
dc.subject Combustion irreversibilities en
dc.subject Spatial distribution en
dc.subject Multi-zone thermodynamic model en
dc.subject Quasi-dimensional combustion model en
dc.subject.classification Chemistry, Physical en
dc.subject.classification Energy & Fuels en
dc.subject.classification Environmental Sciences en
dc.subject.classification Physics, Atomic, Molecular & Chemical en
dc.subject.other LAMINAR-BURNING VELOCITY en
dc.subject.other AVAILABILITY ANALYSIS en
dc.subject.other 2ND-LAW ANALYSIS en
dc.subject.other OXIDE FORMATION en
dc.subject.other NATURAL-GAS en
dc.subject.other MODEL en
dc.subject.other PERFORMANCE en
dc.subject.other DIESEL en
dc.subject.other VALIDATION en
dc.subject.other OPERATION en
dc.title Generation of combustion irreversibilities in a spark ignition engine under biogas-hydrogen mixtures fueling en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.ijhydene.2009.02.087 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.ijhydene.2009.02.087 en
heal.language English en
heal.publicationDate 2009 en
heal.abstract Availability analysis is applied to the cylinder of a spark ignition engine during the closed part of the engine cycle when biogas-hydrogen blends, with volumetric fractions of hydrogen up to 15%, are used as fuel. The focal point is on the demonstration of the spatial distribution inside the burned gas of the combustion-generated irreversibilities for the various hydrogen concentration cases examined, which constitute one of the major sources for the defective exploitation of fuel into useful mechanical work that cannot be identified by the traditional first-law analysis. For this reason, an experimentally validated closed cycle simulation code is used, based on a multi-zone thermodynamic model of the cylinder content, applied in conjunction with a quasi-dimensional combustion model for burn rate predictions. After presenting global availability-balance-related results, pointing out the increase in the second-law efficiency of engine operation with the hydrogen enrichment of biogas, detailed information is provided regarding the spatial development of the combustion irreversibilities throughout the thermodynamically inhomogeneous burned gas, along with their link with the developed temperature field, as determined during combustion at each hydrogen fraction. It is revealed that the addition of increasing amounts of hydrogen in biogas promotes the degree of reversibility of the burning process mainly during the combustion of the later burning gas, due to the incurred increase in its combustion temperatures. On the contrary, the contribution of the early burning gas to the decrease in combustion irreversibilities with hydrogen addition seems to be less prominent. (C) 2009 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved. en
heal.publisher PERGAMON-ELSEVIER SCIENCE LTD en
heal.journalName INTERNATIONAL JOURNAL OF HYDROGEN ENERGY en
dc.identifier.doi 10.1016/j.ijhydene.2009.02.087 en
dc.identifier.isi ISI:000267173700021 en
dc.identifier.volume 34 en
dc.identifier.issue 10 en
dc.identifier.spage 4422 en
dc.identifier.epage 4437 en


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