An experimental investigation on combustion and performance characteristics of supercharged HCCI operation in low compression ratio engine setting

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dc.contributor.authorPolat, Seyfi
dc.contributor.authorYucesu, H. Serdar
dc.contributor.authorUyumaz, Ahmet
dc.contributor.authorKannan, Kaushik
dc.contributor.authorShahbakhti, Mahdi
dc.date.accessioned2021-11-01T15:05:15Z
dc.date.available2021-11-01T15:05:15Z
dc.date.issued2020
dc.department[Belirlenecek]
dc.description.abstractThis study investigates the effects of boost pressure on combustion and performance of an early direct injection homogenous charge compression ignition (HCCI) engine at a low compression ratio (CR). A 2.0 L, four-cylinder, four-stroke, gasoline direct injection engine was converted to operate in early direct injection HCCI mode. In addition, a supercharger unit was developed for engine boosting. The experiments were performed at different intake manifold absolute pressures (MAP) from 1.0 to 1.6 bar at different engine loads using n-heptane fuel. The effects of boost pressure were investigated on HCCI combustion and engine performance characteristics using volumetric efficiency, in-cylinder pressure, heat release rate (HRR), maximum in-cylinder pressure and gas temperature, CA50 (crank angle by which 50% of the fuel is burnt), combustion duration, apparent combustion efficiency, indicated mean effective pressure (IMEP), brake mean effective pressure (BMEP), friction mean effective pressure (FMEP), indicated thermal efficiency (ITE), brake thermal efficiency (BTE), heat loss, exergy of heat loss, coefficient of variation of IMEP (COVIMEP), maximum pressure rise rate (MPRR) and ringing intensity (RI). The experimental results showed that high-efficiency HCCI operation is feasible at an engine compression ratio as low as 9.2 once the engine variables are properly optimized and an appropriate level of supercharging is utilized. An increase in indicated thermal efficiency was seen as boost pressure increased. In addition, combustion phasing advanced by increasing boost pressure or increasing air-fuel equivalence ratio values. Combustion events with CA50 2-3 degrees CA aTDC show the highest thermal efficiency especially at low boost pressure conditions. In addition, the pressure rise rate and ringing intensity increased by increasing air-fuel equivalence ratio and MAP. The test results also showed that HCCI operating range can be extended with the increase of intake manifold pressure especially at high load limits.
dc.description.sponsorshipTUBITAK institute in TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)en_US
dc.description.sponsorshipTUBITAK institute in Turkey is acknowledged for providing financial support for Seyfi Polat to perform this study.en_US
dc.identifier.doi10.1016/j.applthermaleng.2020.115858
dc.identifier.issn1359-4311
dc.identifier.scopus2-s2.0-85089349848
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.applthermaleng.2020.115858
dc.identifier.urihttps://hdl.handle.net/11491/7191
dc.identifier.volume180en_US
dc.identifier.wosWOS:000569818200095
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[Belirlenecek]
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofApplied Thermal Engineering
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectEngine performanceen_US
dc.subjectHCCIen_US
dc.subjectBoost pressureen_US
dc.subjectSuperchargingen_US
dc.subjectRinging intensityen_US
dc.subjectLow compression ratioen_US
dc.titleAn experimental investigation on combustion and performance characteristics of supercharged HCCI operation in low compression ratio engine setting
dc.typeArticle

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