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dc.contributor.authorBabayev, Rafig
dc.contributor.authorAndersson, Arne
dc.contributor.authorDalmau, Albert Serra
dc.contributor.authorIm, Hong G.
dc.contributor.authorJohansson, Bengt
dc.date.accessioned2021-04-13T10:08:06Z
dc.date.available2021-04-13T10:08:06Z
dc.date.issued2021-04-05
dc.date.submitted2021-01-10
dc.identifier.citationBabayev, R., Andersson, A., Dalmau, A. S., Im, H. G., & Johansson, B. (2021). Computational characterization of hydrogen direct injection and nonpremixed combustion in a compression-ignition engine. International Journal of Hydrogen Energy. doi:10.1016/j.ijhydene.2021.02.223
dc.identifier.issn0360-3199
dc.identifier.doi10.1016/j.ijhydene.2021.02.223
dc.identifier.urihttp://hdl.handle.net/10754/668722
dc.description.abstractWith the revived interest in hydrogen (H2) as a direct combustion fuel for engine applications, a computational study is conducted to assess the characteristics of H2 direct-injection (DI) compression-ignition (CI) non-premixed combustion concept. Development of a CFD modeling using CONVERGE CFD solver focuses on hydrogen's unique characteristics by utilizing a suitable numerical method to reproduce the direct H2 injection phenomena. A grid sensitivity study is performed to ensure the fidelity of results with optimal cost, and the models are validated against constant-volume optical chamber and diesel engine experimental data. The present study aims to contribute to the future development of DICI H2 combustion engines, providing detailed characterization of the combustion cycle, and highlighting several distinct aspects of CI nonpremixed H2 versus diesel combustion. First, unlike the common description of diesel sprays, hydrogen jets do not exhibit significant flame lift-off and air entrainment near injector nozzle, and the fuel-air interface is drastically more stratified with no sign of premixing. It is also found that the DICI H2 combustion concept is governed first by a free turbulent jet mixing phase, then by an in-cylinder global mixing phase. The former is drastically more dominant with the DICI H2 engine compared to conventional diesel engines. The free-jet mixing is also found to be more effective that the global mixing, which indicates the need to completely rethink the optimization strategies for CI engines when using H2 as fuel.
dc.description.sponsorshipThis work was sponsored by King Abdullah University of Science and Technology (KAUST) and supported by the KAUST Supercomputing Laboratory (KSL). All simulations were performed on KSL's Shaheen II supercomputer. Convergent Science provided CONVERGE licenses and technical support for this work. The authors would also like to thank Dr. Nhut Lam for providing diesel engine experimental data for validation of CFD models.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0360319921008168
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Hydrogen Energy, [, , (2021-04)] DOI: 10.1016/j.ijhydene.2021.02.223 . © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleComputational characterization of hydrogen direct injection and nonpremixed combustion in a compression-ignition engine
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentComputational Reacting Flow Laboratory (CRFL)
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalInternational Journal of Hydrogen Energy
dc.rights.embargodate2022-04-01
dc.eprint.versionPost-print
dc.contributor.institutionPowertrain Strategic Development (PSD), Volvo Group Trucks Technology (Volvo GTT), Sweden
dc.contributor.institutionCombustion Engine Research Center (CERC), Chalmers University of Technology, Sweden
kaust.personBabayev, Rafig
kaust.personIm, Hong G.
dc.date.accepted2021-02-27
dc.identifier.eid2-s2.0-85103708213
kaust.acknowledged.supportUnitKAUST Supercomputing Laboratory (KSL)
kaust.acknowledged.supportUnitShaheen II
dc.date.published-online2021-04-05
dc.date.published-print2021-05


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