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Optical Studies about the Influence of Diesel Engine Operating Parameters on the Physicochemical Properties of Emitted Soot Particles

Title data

Mühlbauer, Wolfgang ; Leidenberger, Ulrich ; Lorenz, Sebastian ; Brüggemann, Dieter:
Optical Studies about the Influence of Diesel Engine Operating Parameters on the Physicochemical Properties of Emitted Soot Particles.
In: SAE International Journal of Engines. Vol. 6 (8 September 2013) Issue 3 . - pp. 1866-1876.
ISSN 1946- 3936
DOI: https://doi.org/10.4271/2013-24-0184

Abstract in another language

This paper describes the influence of diesel engine operating parameters not only on the properties of the emitted soot particles but also on the whole engine chain of events, which was visualized by optical measurement techniques.The vapor and liquid phase of the injected diesel spray was observed simultaneously by laser-induced exciplex florescence (LIEF) to analyze mixture formation up to the visible start of combustion. The soot formation and oxidation process was evaluated by detecting a spectral range of the soot luminescence and the OH radical. The electrical mobility particle diameter as well as the primary particle size of the emitted soot particles were analyzed by a Scanning Mobility Particle Sizer (SMPS) and by High-Resolution Transmission Electron Microscopy (HR-TEM). Finally, the results were combined to examine the influence of injection pressure, injection timing, boost pressure and engine speed on mixture formation, combustion and the properties of the engine out soot particles. All measurements were carried out on an optically accessible single-cylinder diesel engine.The study shows a strong influence of injection pressure, injection timing and boost pressure as well as of engine speed on combustion, soot formation and oxidation and in particular on properties of the emitted diesel soot particles. Advanced injection and boost pressures as well as higher engine speeds lead to smaller primary particles and to smaller electrical mobility particle diameters and lower particle numbers. This is caused by the enhanced mixture formation resulting in a different soot formation and soot oxidation process during combustion. Different intensities of soot oxidation tends to affect smaller primary particle sizes for a SOI next to the TDC and cause smaller electrical mobility particle diameters and lower particle numbers for early injection events.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes
Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes > Chair Engineering Thermodynamics and Transport Processes - Univ.-Prof. Dr.-Ing. Dieter Brüggemann
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 30 Sep 2019 09:01
Last Modified: 30 Sep 2019 09:01
URI: https://eref.uni-bayreuth.de/id/eprint/48479