caa a22 4500 60619858X CHVBK 20210128100934.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00348-015-1971-1 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1971-1 Development of a sensitive experimental set-up for LIF fuel wall film measurements in a pressure vessel [Elektronische Daten] [Florian Schulz, Jürgen Schmidt, Frank Beyrau] 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 1µm, a geometric resolution of 31µm and a practical applicability for wall film thicknesses smaller 80µm. 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. Springer-Verlag Berlin Heidelberg, 2015 Schulz Florian Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany aut Schmidt Jürgen Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany aut Beyrau Frank Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany aut Experiments in Fluids Springer Berlin Heidelberg 56/5(2015-05-01), 1-16 0723-4864 56:5<1 2015 56 348 https://doi.org/10.1007/s00348-015-1971-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1971-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schulz Florian Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany aut NATIONALLICENCE 700 1- Schmidt Jürgen Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany aut NATIONALLICENCE 700 1- Beyrau Frank Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/5(2015-05-01), 1-16 0723-4864 56:5<1 2015 56 348