Abstract
The in-situ and localized observation of heat release in turbulent flames is important for the validation of computational modeling of turbulent flows with combustion. In the present work we obtain localized information on heat release rate (HRR) by the commonly accepted technique of the simultaneous and single-shot planar imaging of OH and CH2O concentrations by laser-induced fluorescence (LIF). Additionally, we combine this with the simultaneous line-of-sight and temporally resolved chemiluminescence detection of OH∗, spatially integrated within the flame volume, interrogated by the laser sheets used for the HRR imaging technique. The combined diagnostic methods are demonstrated for a swirl-stabilized, premixed turbulent methane/air flame of 30-kW thermal power, and they show the existence of correlations between both HRR-sensitive diagnostic techniques.
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The authors acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) within the collaborative program ‘Chemiluminescence and heat release’.
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Röder, M., Dreier, T. & Schulz, C. Simultaneous measurement of localized heat release with OH/CH2O-LIF imaging and spatially integrated OH∗ chemiluminescence in turbulent swirl flames. Appl. Phys. B 107, 611–617 (2012). https://doi.org/10.1007/s00340-012-4990-0
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DOI: https://doi.org/10.1007/s00340-012-4990-0