Visualization Investigation of a Diesel-Gasoline Mixture Jet

  • Author / Creator
    Zhu, Jiaxin
  • 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.

  • Subjects / Keywords
  • Graduation date
    Fall 2016
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. 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.