2026-09-19T08:04:53Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/477972021-07-05T14:03:20Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023

Simone Hochgreb. Dawson, Mark A. (Mark Anthony), 1975- Massachusetts Institute of Technology. Department of Mechanical Engineering 2009-10-01T15:44:19Z 2009-10-01T15:44:19Z 1998 1998 http://hdl.handle.net/1721.1/47797 42900214 Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998. Includes bibliographical references (leaves 77-78). In recent years carburetor injection systems in spark ignited (SI) engines have been replaced with port-fuel injection systems, and as a result there has been a significant increase in the levels of hydrocarbon (HC) emissions from SI engines during their cold start period. The presence of liquid fuel in the combustion chamber, during a cold start, is believed to contribute significantly to the increased levels. This work uses planar laser induced fluorescence to visualize the development of liquid fuel in the cylinder of a firing SI engine. A closed valve injection strategy was used, as this is the strategy most commonly found in practice. Fluorescence from indolene and iso-octane doped with acetone and 3-pentanone was used to examine volatility effects. Images were taken on three planes through the cylinder and a number of post-processing techniques were used to analyze the results. The results were analyzed on both a time and crank-angle (CA) basis. Analysis on a crank-angle basis relates the location of liquid fuel entering the cylinder to engine events, and shows a maximum in the quantity of liquid fuel coming from the back of the intake valve at the crank angle position closest to the position of maximum valve lift. A semi-quantitative analysis based on the integration of the image intensities shows the time development of liquid fuel in the cylinder, and highlights the volatility effects. by Mark A. Dawson. S.M. 102 leaves eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering In cylinder liquid fuel visualization during cold start Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="122550b3-1590-44ba-94e3-344e620077cb"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>In cylinder liquid fuel visualization during cold start</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>1998</PublicationDate> <Authors> <Author> <DisplayName>Dawson, Mark A. (Mark Anthony), 1975-</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering</Keyword> <Abstract>In recent years carburetor injection systems in spark ignited (SI) engines have been replaced with port-fuel injection systems, and as a result there has been a significant increase in the levels of hydrocarbon (HC) emissions from SI engines during their cold start period. The presence of liquid fuel in the combustion chamber, during a cold start, is believed to contribute significantly to the increased levels. This work uses planar laser induced fluorescence to visualize the development of liquid fuel in the cylinder of a firing SI engine. A closed valve injection strategy was used, as this is the strategy most commonly found in practice. Fluorescence from indolene and iso-octane doped with acetone and 3-pentanone was used to examine volatility effects. Images were taken on three planes through the cylinder and a number of post-processing techniques were used to analyze the results. The results were analyzed on both a time and crank-angle (CA) basis. Analysis on a crank-angle basis relates the location of liquid fuel entering the cylinder to engine events, and shows a maximum in the quantity of liquid fuel coming from the back of the intake valve at the crank angle position closest to the position of maximum valve lift. A semi-quantitative analysis based on the integration of the image intensities shows the time development of liquid fuel in the cylinder, and highlights the volatility effects.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>