Simultaneous planar measurements of soot structure and velocity fields in a turbulent lifted jet flame at 3 kHz |
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Authors: | M K?hler I Boxx K P Geigle and W Meier |
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Institution: | (1) Institut f?r Verbrennungstechnik, Deutsches Zentrum f?r Luft-und Raumfahrt (DLR), Pfaffenwaldring 38-40, 70569 Stuttgart, Germany;(2) Air Force Research Laboratory (AFRL)/RZAS, 1950 Fifth St, Wright-Patterson AFB, OH, USA |
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Abstract: | We describe a newly developed combustion diagnostic for the simultaneous planar imaging of soot structure and velocity fields
in a highly sooting, lifted turbulent jet flame at 3000 frames per second, or two orders of magnitude faster than “conventional”
laser imaging systems. This diagnostic uses short pulse duration (8 ns), frequency-doubled, diode-pumped solid state (DPSS)
lasers to excite laser-induced incandescence (LII) at 3 kHz, which is then imaged onto a high framerate CMOS camera. A second
(dual-cavity) DPSS laser and CMOS camera form the basis of a particle image velocity (PIV) system used to acquire 2-component
velocity field in the flame. The LII response curve (measured in a laminar propane diffusion flame) is presented and the combined
diagnostics then applied in a heavily sooting lifted turbulent jet flame. The potential challenges and rewards of application
of this combined imaging technique at high speeds are discussed. |
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Keywords: | |
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