Updated:
15.11.2010
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Combustion Diagnostics
Using model as well as full scale industrial burners in our lab we develop laser and other optical measurement techniques for the investigation of combustion processes and flows. In collaborations with industrial and academic research partners we apply the various techniques, such as laser-induced fluorescence (LIF), spontaneous Raman scattering, coherent anti-Stokes Raman spectroscopy (CARS), chemiluminescence (CL), particle imaging velocimetry (PIV), laser-induced grating spectroscopy. The parameters addressed include flame fronts, temperature, flow velocity, local fuel/air ratios, soot formation, among others. The application range spans from gas turbine and high-pressure high-temperature combustion to catalytically-stabilized combustor models. To work on the various projects, seven laser systems are available in the laboratory.
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This superposition of different LIF signals from a methane-air flame in a Wolfhard-Parker burner (width: 7.5 mm, air-fuel equivalence ratio λ = 0.56) indicates the existence of various species: (green) OH; (red) CN; (yellow) CH; (magenta) excitation of a “hot” line of CH2O; (blue) excitation of a “cold” line of CH2O.
See Appl. Phys. B64, 579 (1997) for details on the detection, in part simultaneously, of the various species. |
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