Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/15144
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dc.contributor.authorWang, X-
dc.contributor.authorMa, J-
dc.contributor.authorZhao, H-
dc.date.accessioned2017-09-13T13:59:56Z-
dc.date.available2017-09-13T13:59:56Z-
dc.date.issued2017-
dc.identifier.citationProc. IMechE, Part D: Journal of Automobile Engineeringen_US
dc.identifier.urihttp://bura.brunel.ac.uk/handle/2438/15144-
dc.description.abstractIn this study, a 2-stroke Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) engine was proposed and researched to achieve aggressive engine downsizing and downspeeding. Compared to the loop or cross scavenged 2-stroke engines, the BUSDIG engine can achieve excellent scavenging performance and be operated with higher boost pressure as well as the absence of air and fuel short-circuiting. As a fundamental engine geometric parameter, the bore/stroke (B/S) ratio would directly affect the scavenging process in the uniflow scavenged 2-stroke engine. In this paper, the three dimensional (3D) computational fluid dynamics (CFD) simulations were applied to investigate the scavenging process in the BUSDIG engine with different bore/stroke (B/S) ratios. Four bore and stroke (B/S) ratios of 0.66, 0.8, 1 and 1.3 were analyzed. The results indicate that a bigger B/S ratio leads to deteriorated swirl flow motion but better delivery ratio (DR), scavenging efficiency (SE) and charging efficiency (CE). In order to fulfil the potential of the BUSDIG engine with different B/S ratios, two key scavenge port angles, i.e. Axis Inclination Angle (AIA) and Swirl Orientation Angle (SOA), were varied from the baseline design (AIA=90⁰, SOA=20⁰) to study their effects on the scavenging process for each B/S ratio design. Overall, a larger AIA leads to lower swirl ratio (SR) but achieves better scavenge performance, which is much crucial for a large B/S ratio design. A small SOA design leads to noticeably lower SR but superior scavenging performances for a small B/S ratio design. An intermediate SOA, e.g. 10 and 20⁰, is preferred to improve the scavenging for a large B/S ratio design.en_US
dc.description.sponsorshipThe authors gratefully acknowledge the financial support by the Engineering and Physical Sciences Research Council (EPSRC). The data of this paper can be accessed from the Brunel University London data archive, figshare at https://doi.org/10.17633/rd.brunel.5383951.v1.en_US
dc.language.isoenen_US
dc.subjectcomputational fluid dynamicsen_US
dc.subject2-stroke engineen_US
dc.subjectuniflowen_US
dc.subjectscavenging processen_US
dc.subjectbore/stroke ratioen_US
dc.titleAnalysis of the Effect of the Bore/Stroke (B/S) Ratio and Scavenge Port Angles on the Scavenging Process in a 2-Stroke Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engineen_US
dc.typeArticleen_US
dc.relation.isPartOfProc. IMechE, Part D: Journal of Automobile Engineering-
pubs.publication-statusAccepted-
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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