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Visualization Investigation of a Diesel-Gasoline Mixture Jet Open Access


Other title
Blended Fuel
Diesel Injector
Type of item
Degree grantor
University of Alberta
Author or creator
Zhu, Jiaxin
Supervisor and department
Fleck, Brian (Mechanical Engineering)
Koch, Bob (Mechanical Engineering)
Examining committee member and department
Olfert, Jason (Mechanical Engineering)
Department of Mechanical Engineering

Date accepted
Graduation date
2016-06:Fall 2016
Master of Science
Degree level
This thesis is an experimental investigation using optical methods to study atomization of fuel injectors for IC engines using a dual fuel mixture involving diesel and gasoline blends, which is called "dieseline". Experiments were executed in a heated pressurized optical chamber which simulated some of the conditions typical in internal combustion (IC) engine fuel injection. High speed videography was used to obtain shadowgraph and Schlieren images which were used to evaluate the important atomization geometrical parameters of spray angle and penetration. The effect of fuel blending on fuel injection is shown. The experimental chamber was heated up to 850 K from room temperature (approximately 300 K), so as to cover the non-evaporating and evaporating conditions of the jet. Optical access windows in the vessel allow the simultaneous measurement using two high speed cameras. Traditional shadowgraph of liquid fuel jet is obtained through one camera; while the vapor phase of the fuel jet is observed using focused shadowgraph technique, whose setup is similar to the Schlieren technique. A total of 189 injection events are investigated. The effect of three input variables, chamber temperature, background gas density and injection pressure are studied on the jet penetration, quasi-steady liquid jet length, jet area and jet angle as output variables. The results show that dieseline fuel decreases the quasi-steady jet length significantly compared with pure diesel fuel, and the advancement of evaporation in temperature is less than 200 K in this study. The dieseline fuel is found not to change the sensitivity of the three input variables. Background gas density and chamber temperature are found to have significant influence on the quasi-steady liquid jet length. At the end, the experiment validity is checked with current literature.
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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