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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Xinda Zhu & Manu Mannazhi & Natascia Palazzo & Per-Erik Bengtsson & Öivind Andersson, 2020. "High-Speed Imaging of Spray Formation and Combustion in an Optical Engine: Effects of Injector Aging and TPGME as a Fuel Additive," Energies, MDPI, vol. 13(12), pages 1-26, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3105-:d:372032
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    References listed on IDEAS

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    1. Moon, Seoksu & Huang, Weidi & Li, Zhilong & Wang, Jin, 2016. "End-of-injection fuel dribble of multi-hole diesel injector: Comprehensive investigation of phenomenon and discussion on control strategy," Applied Energy, Elsevier, vol. 179(C), pages 7-16.
    2. Wang, Ziman & Jiang, Changzhao & Xu, Hongming & Badawy, Tawfik & Wang, Bo & Jiang, Yizhou, 2017. "The influence of flash boiling conditions on spray characteristics with closely coupled split injection strategy," Applied Energy, Elsevier, vol. 187(C), pages 523-533.
    3. Ma, Shuaiying & Zheng, Zunqing & Liu, Haifeng & Zhang, Quanchang & Yao, Mingfa, 2013. "Experimental investigation of the effects of diesel injection strategy on gasoline/diesel dual-fuel combustion," Applied Energy, Elsevier, vol. 109(C), pages 202-212.
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