Combustion and performance characteristics of an HCCI engine utilizing trapped residual gas via reduced valve lift

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dc.contributor.authorÇınar, Can
dc.contributor.authorUyumaz, Ahmet
dc.contributor.authorPolat, Seyfi
dc.contributor.authorYılmaz, Emre
dc.contributor.authorCan, Özer
dc.contributor.authorSolmaz, Hamit
dc.date.accessioned2019-05-13T09:03:38Z
dc.date.available2019-05-13T09:03:38Z
dc.date.issued2016
dc.departmentHitit Üniversitesi, Mühendislik Fakültesi, Mekatronik Mühendisliği Bölümü
dc.description.abstractIn this study, the effects of residual gas fraction (RGF) on homogeneous charged compression ignition (HCCI) combustion were investigated experimentally. Experiments were performed at different lambda values and constant intake air temperature of 80 °C with the blend of 20% n-heptane and 80% isooctane (PRF80) test fuel. In order to obtain exhaust gas trapping and HCCI operation, two different cam mechanisms, having reduced valve lift, were used. Valve lift values of 5.5 mm (In5.5) and 3.5 mm (In3.5) were used in cam mechanisms. Exhaust valve lift values were 3.5 mm (Ex3.5) for both cam mechanisms. The experimental findings showed that in-cylinder pressure and heat release rate decreased using In5.5-Ex3.5 cam mechanism compared to In3.5-Ex3.5. More residual gases were trapped using In3.5-Ex3.5 cam mechanism. Combustion was also retarded with low lift cams due to more trapped residual gases. Indicated thermal efficiency was found 28.4% with In 3.5-Ex 3.5 whereas obtained 33.57% with In 5.5-Ex 3.5 cam mechanism at 1000 rpm. RGF was computed as 20.12% and 21.12% with In 5.5-Ex 3.5 and In 3.5-Ex 3.5 cam mechanisms, respectively, at 1000 rpm engine speed and stoichiometric air/fuel ratio. Moreover, indicated thermal efficiency was found to be higher about 17.91% with In 5.5-Ex 3.5 according to In 3.5-Ex 3.5 at 1200 rpm. Consequently, it was observed that HCCI combustion phasing can be controlled using low lift cams. It was seen that trapping exhaust gases in the cylinder is a feasible and practical method to control combustion phasing and spread out the HCCI operating range. In addition, stable HCCI combustion can be achieved trapping exhaust gases resulting in avoiding knocking especially at high engine loads. © 2016 Elsevier Ltd. All rights reserved.
dc.identifier.citationÇınar, C., Uyumaz, A., Polat, S., Yılmaz, E., Can, Ö., Solmaz, H. (2016). Combustion and performance characteristics of an HCCI engine utilizing trapped residual gas via reduced valve lift. Applied Thermal Engineering, 100, 586-594.
dc.identifier.doi10.1016/j.applthermaleng.2016.02.080
dc.identifier.endpage594en_US
dc.identifier.issn1359-4311
dc.identifier.scopusqualityQ1
dc.identifier.startpage586en_US
dc.identifier.urihttps://doi.org/10.1016/j.applthermaleng.2016.02.080
dc.identifier.urihttps://hdl.handle.net/11491/1507
dc.identifier.volume100en_US
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier 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.subjectHCCI Combustionen_US
dc.subjectHCCI Operating Rangeen_US
dc.subjectHeat Release Rateen_US
dc.subjectLow Lift Camen_US
dc.subjectResidual Gas Fractionen_US
dc.titleCombustion and performance characteristics of an HCCI engine utilizing trapped residual gas via reduced valve lift
dc.typeArticle

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