Soot volume fraction measurements in aero-engine exhausts using extinction-calibrated backward laser-induced incandescence |
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Authors: | J Delhay P Desgroux E Therssen H Bladh P-E Bengtsson H H?nen J D Black and I Vallet |
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Institution: | (1) School of Engineering and Electronics, The University of Edinburgh, Edinburgh, EH9 3JL, Scotland, UK;(2) Laboratoire de Combustion et de D?tonique, 1 av. Cl?ment Ader, BP 40109, 86961 Futuroscope Cedex, Poitiers, France;(3) CNRS UMR 7190-Institut Jean le Rond d’Alembert, Universit? Pierre et Marie Curie-Paris6, Paris, France; |
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Abstract: | Control and reduction of soot particle emissions from aeronautic turbines requires a monitoring system suitable for quantification
of these emissions. Currently, such emissions are estimated using the technique of smoke number. This is an extractive method,
which is not sensitive enough for the low emission levels of modern gas turbines. Within a recent European project, AEROTEST,
part of the project aimed at investigating an alternative soot monitoring technique, laser-induced incandescence (LII) as
an in-situ optical diagnostic for quantification of soot emissions. For aero-engine applications, especially those involving
large-scale turbines, it is necessary to perform the measurements at long distance from the turbine. The LII technique is
favourable in this respect as it provides for non-intrusive measurements and, by detecting the isotropic LII signal along
the same axis as the incoming laser beam (so called backward LII), both the laser and the detector can be built inside one
system located several meters from the turbine. The concept was initiated in the previous European projects, AEROJET I and
II. This paper describes the modified version of the system and the procedure developed to achieve reliable and quantitative
soot volume fraction measurements in the exhausts of aero-engines. Application of the backward LII technique is demonstrated
in the exhaust of a military turbojet engine for different engine speeds. |
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Keywords: | PACS" target="_blank">PACS 42 62 -b 42 62 cf 42 62 Eh |
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