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Optical diagnostics of diesel spray injections and combustion in a high-pressure high-temperature cell

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Abstract

We report on spatially and temporally resolved optical diagnostic measurements of propagation and combustion of diesel sprays introduced through a single-hole fuel injector into a constant volume, high-temperature, high-pressure cell. From shadowgraphy images in non-reacting environments of pure nitrogen, penetration lengths and dispersion angles were determined for non-vaporizing and vaporizing conditions, and found to be in reasonable agreement with standard models for liquid jet propagation and break-up.

Quasi-simultaneous two-dimensional images were obtained of laser elastic light scattering, shadowgraphs and spectrally integrated flame emission in a reacting environment (cell temperature 850 K). In addition laser-induced incandescence was employed for the identification of soot-loaded regions. The simultaneously recorded spray images exhibit remarkable structural similarity and provide complementary information about the spray propagation and combustion process. The measurements also reveal the fuel vapor cloud extending well beyond the liquid core and close to the nozzle tip. Ignition takes place close to the tip of the spray within the mixing layer of fuel vapor and surrounding air. Soot is formed in the vapor core region at the tip of the liquid fuel jet. Our results support recently developed phenomenological model on diesel spray combustion.

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Authors and Affiliations

  1. Reaction Analysis Group, Department of General Energy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland

    B. Bougie, M. Tulej, T. Dreier & T. Gerber

  2. Institute for Molecules and Materials, Applied Physics, Radboud University Nijmegen, Toernooiveld 1, 6525 ED, Nijmegen, The Netherlands

    B. Bougie, N. J. Dam & J. J. Ter Meulen

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  1. B. Bougie
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  2. M. Tulej
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  3. T. Dreier
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  4. N. J. Dam
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  5. J. J. Ter Meulen
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  6. T. Gerber
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Correspondence to T. Dreier.

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Bougie, B., Tulej, M., Dreier, T. et al. Optical diagnostics of diesel spray injections and combustion in a high-pressure high-temperature cell. Appl. Phys. B 80, 1039–1045 (2005). https://doi.org/10.1007/s00340-005-1830-5

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  • DOI: https://doi.org/10.1007/s00340-005-1830-5

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