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Volumetric efficiency modeling of a four stroke IC engine

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dc.contributor.authorYin, Shumei, author
dc.contributor.authorKirkpatrick, Allan T., advisor
dc.contributor.authorCheney, Margaret, committee member
dc.contributor.authorGao, Xinfeng, committee member
dc.date.accessioned2017-06-09T15:41:15Z
dc.date.available2017-06-09T15:41:15Z
dc.date.issued2017
dc.description.abstractVolumetric efficiency, one of the most important engine performance parameters, is influenced by several engine parameters such as valve timing, valve lift, intake and exhaust runner length, and intake and exhaust pressure. To explore how these parameters impact volumetric efficiency, a 1D unsteady thermal fluid analysis is performed to determine the instantaneous cylinder pressure and the mass flow rate through the intake and exhaust valves during the intake and exhaust processes. In addition to a MATLAB implementation, a GT-Power model is also developed for validation. A synthetic intake pressure pulse is then added to the model to explore the engine intake tuning effect. The results predict a volumetric efficiency increase by about $9\%$ when this pulse enters the cylinder near bottom dead center (BDC). The prediction is consistent with an acoustic model predicting that the maximum volumetric efficiency is reached when the natural frequency of the intake system equals the frequency of the intake process. The GT-Power model is also used to validate the relationship between the engine speed and intake runner length for optimal volumetric efficiency. The results from GT-Power do not agree with the Helmholtz model very well. Finally, the effect of the intake valve timing, valve lift and intake and exhaust pressure on volumetric efficiency are also determined.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierYin_colostate_0053N_14111.pdf
dc.identifier.urihttp://hdl.handle.net/10217/181384
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectMATLAB
dc.subjectvolumetric efficiency
dc.subjectmodeling
dc.subjectGT-Power
dc.titleVolumetric efficiency modeling of a four stroke IC engine
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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