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Computational chara...
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Babayev, RafigKing Abdullah University of Science and Technology (KAUST)
(författare)
Computational characterization of hydrogen direct injection and nonpremixed combustion in a compression-ignition engine
- Artikel/kapitelEngelska2021
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Nummerbeteckningar
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LIBRIS-ID:oai:research.chalmers.se:87e6089c-f39d-48c0-aa5a-c7d837f87ef7
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https://doi.org/10.1016/j.ijhydene.2021.02.223DOI
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https://research.chalmers.se/publication/523210URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
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With the revived interest in hydrogen (H ) as a direct combustion fuel for engine applications, a computational study is conducted to assess the characteristics of H 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 H 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 H combustion engines, providing detailed characterization of the combustion cycle, and highlighting several distinct aspects of CI nonpremixed H 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 H 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 H 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 H as fuel. 2 2 2 2 2 2 2 2
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Andersson, ArneVolvo Cars
(författare)
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Dalmau, Albert SerraVolvo Cars
(författare)
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Im, Hong G.King Abdullah University of Science and Technology (KAUST)
(författare)
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Johansson, Bengt,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bengtj
(författare)
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King Abdullah University of Science and Technology (KAUST)Volvo Cars
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:International Journal of Hydrogen Energy: Elsevier BV46:35, s. 18678-186960360-3199
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