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Development of a sensitive experimental set-up for LIF fuel wall film measurements in a pressure vessel

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Abstract

This paper focusses on fundamental investigations of fuel wall films, which are formed when the spray impinges on the piston or cylinder walls. To reproduce the wide range of operating conditions within homogeneously charged gasoline direct-injection engines, it is necessary to use a film thickness measurement method, which can be applied inside a high-pressure, high-temperature vessel. Hence, we developed a method based on laser-induced fluorescence that reaches: a precision better than 1 µm, a geometric resolution of 31 µm and a practical applicability for wall film thicknesses smaller 80 µm. To obtain accurate film thickness results, we provide a detailed description of the selection of the surrogate fuel isooctane with 3-pentanone as fluorescence tracer and the resulting assembly of the excitation source, beam expander, filters, camera and the essential image processing. Furthermore, advantages and disadvantages of other possible solutions are discussed. Earlier publications provide only little information about the accuracy of their calibration and measurement procedures. Therefore, we tested and compared three basic calibration methods to each other and provide an analysis of possible errors, such as the influence of the preferential evaporation of 3-pentanone. Finally, images of resulting wall films are presented, and practical considerations for the execution of the measurements like recording timings are discussed.

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  1. Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany

    Florian Schulz, Jürgen Schmidt & Frank Beyrau

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  1. Florian Schulz
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  2. Jürgen Schmidt
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  3. Frank Beyrau
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Correspondence to Florian Schulz.

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Schulz, F., Schmidt, J. & Beyrau, F. Development of a sensitive experimental set-up for LIF fuel wall film measurements in a pressure vessel. Exp Fluids 56, 98 (2015). https://doi.org/10.1007/s00348-015-1971-1

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  • DOI: https://doi.org/10.1007/s00348-015-1971-1

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