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Title:Fuel Preparation in the Cylinder of a Port-Injected, Spark Ignition Engine
Author(s):Kelly-Zion, Peter Lynwood
Doctoral Committee Chair(s):Peters, James E.
Department / Program:Mechanical Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Automotive
Abstract: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.
Issue Date:1998
Description:130 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1998.
Other Identifier(s):(MiAaPQ)AAI9912288
Date Available in IDEALS:2015-09-25
Date Deposited:1998

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