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Peters, James E. Kelly-Zion, Peter Lynwood 2015-09-25T21:12:59Z 2015-09-25T21:12:59Z 10000-01-01 1998 1998 Liquid fuel in the cylinder was found to be the primary cause of inhomogeneity in the fuel distribution and therefore a principal contributor to HC emission. Much more liquid enters the cylinder with open-valve injection than with closed-valve injection. For some conditions a significant amount of liquid wets a small region of the cylinder wall and the slow evaporation of this liquid causes a locally high fuel vapor concentration at the end of the compression stroke. Increasing intake air velocity reduces the rate of fuel accumulation in the intake port, the sizes of droplets passing into the cylinder, and the amount of wall impingement, providing a more uniform fuel distribution in the cylinder. In addition, inhomogeneities in the fuel distribution within the cylinder which are present during the intake event can be substantially reduced by the end of the compression stroke with in-cylinder swirl. Increasing engine speed from 200 to 1200 rpm was much less effective for enhancing mixing than was increased swirl. Finally, the injector spray quality was found to affect the droplet sizes passing into the cylinder only for an open-valve injection timing. Made available in DSpace on 2015-09-25T21:12:59Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9912288.pdf: 8162188 bytes, checksum: 65c435276f3aa3a4cfe9141df5bb8579 (MD5) Previous issue date: 1998 Embargo set by: Seth Robbins for item 85257 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 130 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998. http://hdl.handle.net/2142/83976 (MiAaPQ)AAI9912288 eng Engineering, Automotive Fuel Preparation in the Cylinder of a Port-Injected, Spark Ignition Engine text Mechanical Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.