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University of New South Wales

1. Le, Minh Khoi. Understanding the development of a reacting fuel jet inside an automotive-size diesel engine using optical and laser-based diagnostics.

Degree: Mechanical & Manufacturing Engineering, 2015, University of New South Wales

The fuel penetration and reacting diesel jet development have been studied in a small-bore optical engine to improve the understanding of a swirl-influenced, wall-interacting diesel flame. The optical access to the engine combustion chamber was made possible via multiple quartz windows positioned in a cylindrical piston bowl and cylinder liner. Using the common-rail fuel injection system of the engine, the fuel injection was executed for long duration, creating negative ignition dwell conditions in which the start of combustion occurs before the end of injection. A single-hole nozzle was used to isolate the jet-wall interaction from jet-jet interactions while limiting the in-cylinder pressure below the burst-pressure of quartz windows. Planar laser-induced fluorescence imaging of hydroxyl (OH-PLIF), fuel-PLIF, and line-of-sight integrated chemiluminescence imaging were performed for various combustion stages identified by the in-cylinder pressure traces and apparent heat release rates. These include stages of vaporising fuel penetration, low-temperature reaction, and high-temperature reaction. The fuel-PLIF images show that the fuel penetration was strongly influenced by a swirl flow with the wall-jet penetration on the up-swirl side being shorter than that of the down-swirl jet. During the low-temperature reaction, cool flame chemiluminescence appears in the wall-jet head region. Interestingly, this region is where a turbulent ring-vortex is formed due to jet-wall interactions, suggesting that locally enhanced mixing induced the first-stage ignition. The OH-PLIF images show that the second-stage, high-temperature reaction starts to occur and then expand drastically in the same wall-jet head region. Since the reaction occurs in the wall-jet region, the swirl flow impacts the high-temperature reaction significantly, as evidenced by more intense OH signals in the down-swirl jet. This is due to the influence of the swirl flow on the mixing process, leading to relatively richer mixtures on the down-swirl side. Upon the end of fuel injection, the heat release rate declines and the OH-PLIF signals slowly diminish.How the variation in injection pressure influences the combustion processes of a wall-interacting diesel jet has also been investigated. The cool-flame images together with the apparent heat release rate suggest that the low-temperature reaction still emerges from the wall-interacting jet head region but it becomes stronger with increasing injection pressure due to the better air-fuel mixing at the enhanced turbulent ring-vortex. The influence of in-cylinder swirl flow on the OH* chemiluminescence signals was again observed such that the high-temperature reaction in the down-swirl side of the jet occurs earlier than that in the up-swirl side of the jet regardless of the injection pressure. Moreover, the second-stage ignition on the down-swirl side of the jet is also found to be stronger than the up-swirl side of the jet initially. However, as the injection pressure increases and the high temperature reaction… Advisors/Committee Members: Kook, Sanghoon, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: Laser diagnostics; Optical engine; Engine combustion; OH-PLIF; Soot-PLII; Optical diagnostics; Diesel engine; Diesel jet development

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APA (6th Edition):

Le, M. K. (2015). Understanding the development of a reacting fuel jet inside an automotive-size diesel engine using optical and laser-based diagnostics. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/55272 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37004/SOURCE02?view=true

Chicago Manual of Style (16th Edition):

Le, Minh Khoi. “Understanding the development of a reacting fuel jet inside an automotive-size diesel engine using optical and laser-based diagnostics.” 2015. Doctoral Dissertation, University of New South Wales. Accessed April 13, 2021. http://handle.unsw.edu.au/1959.4/55272 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37004/SOURCE02?view=true.

MLA Handbook (7th Edition):

Le, Minh Khoi. “Understanding the development of a reacting fuel jet inside an automotive-size diesel engine using optical and laser-based diagnostics.” 2015. Web. 13 Apr 2021.

Vancouver:

Le MK. Understanding the development of a reacting fuel jet inside an automotive-size diesel engine using optical and laser-based diagnostics. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2021 Apr 13]. Available from: http://handle.unsw.edu.au/1959.4/55272 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37004/SOURCE02?view=true.

Council of Science Editors:

Le MK. Understanding the development of a reacting fuel jet inside an automotive-size diesel engine using optical and laser-based diagnostics. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/55272 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:37004/SOURCE02?view=true

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