Analysis of Improved In-Cylinder Combustion Characteristics with Chamber Modifications of the Diesel Engine

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aut.relation.endpage2586
aut.relation.issue6
aut.relation.journalEnergies
aut.relation.startpage2586
aut.relation.volume16
dc.contributor.authorDoppalapudi, AT
dc.contributor.authorAzad, AK
dc.contributor.authorKhan, MMK
dc.date.accessioned2023-05-30T01:51:47Z
dc.date.available2023-05-30T01:51:47Z
dc.date.issued2023-03-09
dc.description.abstractThis study numerically analyses the effects of chamber modifications to investigate the improvement of in-cylinder combustion characteristics of the diesel engine using a computational fluid dynamics (CFD) approach. Five different modified chambers, namely, the double swirl combustion chamber (DSCC), bathtub combustion chamber (BTCC), double toroidal re-entrant combustion chamber (DTRCC), shallow depth combustion chamber (SCC), and stepped bowl combustion chamber (SBCC) were developed and compared with a reference flat combustion chamber (FCC). The effects of chamber modifications on temperature formation, velocity distribution, injection profiles, and in-cylinder turbulent motions (swirl and tumble ratio) were investigated. During the compression stroke, near top dead centre, the SCC showed a peak temperature of 970 K, followed by the FCC (968 K), SBCC (967 K), and DTRCC (748 K to 815 K). The DSCC and the SCC showed a high swirl ratio above 0.6, whereas the DTRCC and the BTCC showed a high tumble ratio of approximately 0.4. This study found that the SCC, BTCC, and DSCC have better combustion rates than the FCC in terms of temperature, heat release rate, and velocity distribution. However, the DTRCC showed poor temperature formation rates and rapid heat release rates (approx. 150 J/°CA), which can lead to rapid combustion and knocking tendencies. In conclusion, the DSCC and the SCC showed better combustion rates than the other chambers. In addition, turbulent motions inside the chambers avoided combustion in crevice regions. This study recommends avoiding chambers with wider bowls in order to prevent uneven combustion across the cylinder. Furthermore, split bowls such as the DSCC, along with adjusted injection rates, can provide better results in terms of combustion.
dc.identifier.citationEnergies, ISSN: 1996-1073 (Print); 1996-1073 (Online), MDPI AG, 16(6), 2586-2586. doi: 10.3390/en16062586
dc.identifier.doi10.3390/en16062586
dc.identifier.issn1996-1073
dc.identifier.issn1996-1073
dc.identifier.urihttps://hdl.handle.net/10292/16182
dc.languageen
dc.publisherMDPI AG
dc.relation.urihttps://www.mdpi.com/1996-1073/16/6/2586
dc.rights.accessrightsOpenAccess
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject40 Engineering
dc.subject4017 Mechanical Engineering
dc.subject4002 Automotive Engineering
dc.subject02 Physical Sciences
dc.subject09 Engineering
dc.subject33 Built environment and design
dc.subject40 Engineering
dc.subject51 Physical sciences
dc.titleAnalysis of Improved In-Cylinder Combustion Characteristics with Chamber Modifications of the Diesel Engine
dc.typeJournal Article
pubs.elements-id501401
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