Fuel Preparation in the Cylinder of a Port-Injected, Spark Ignition Engine
Kelly-Zion, Peter Lynwood
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/83976
Description
Title
Fuel Preparation in the Cylinder of a Port-Injected, Spark Ignition Engine
Author(s)
Kelly-Zion, Peter Lynwood
Issue Date
1998
Doctoral Committee Chair(s)
Peters, James E.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Automotive
Language
eng
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.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
