High-Speed Imaging of Spray Formation and Combustion in an Optical Engine: Effects of Injector Aging and TPGME as a Fuel Additive

Xinda Zhu, Manu Mannazhi, Natascia Palazzo, Per-Erik Bengtsson and Öivind Andersson
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Xinda Zhu: Division of Combustion Engines, Department of Energy Sciences, Lund University, SE22100 Lund, Sweden
Manu Mannazhi: Division of Combustion Physics, Department of Physics, Lund University, SE22100 Lund, Sweden
Natascia Palazzo: Institute of Engineering Thermodynamics, Friedrich-Alexander-University of Erlangen-Nürnberg, 91054 Erlangen, Germany
Per-Erik Bengtsson: Division of Combustion Physics, Department of Physics, Lund University, SE22100 Lund, Sweden
Öivind Andersson: Division of Combustion Engines, Department of Energy Sciences, Lund University, SE22100 Lund, Sweden

Energies, 2020, vol. 13, issue 12, 1-26

Abstract: High-speed imaging of fuel sprays and combustion is conducted on a light-duty optical engine to investigate the effects of injector aging, with a focus on soot. The spray behaviors of one new and one aged injector are compared using Mie-scattering. In addition to this, the combustion process of a baseline diesel fuel and a blend with TPGME (tripropylene glycol monomethyl ether) are compared using natural luminosity (NL) imaging. TPGME is an oxygenated additive which can be used to reduce soot emissions. X-ray tomography of the two injectors demonstrates that the aging does not lead to significant geometry differences, nor to formation of dense internal nozzle deposits. Both injectors show similar liquid penetration and spreading angle. However, the aged injector shows a prolonged injection and more fuel dribbling after the injection events, leading to a higher injection quantity. The fuel quantity difference shows a larger impact on the NL at low load than the TPGME additive, indicating that the in-cylinder temperature is more important for soot oxidation than oxygen concentration under these conditions. At medium load, the NL is much less sensitive to small temperature variations, while the TPGME is more effective for soot reduction.

Keywords: injector aging; spray formation; diesel combustion; natural luminosity; TPGME (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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