Two-dimensional concentration and temperature measurements in extended flames of industrial  burners using PLIF

Dirk Mueller; Wolfgang Triebel; Arne Bochmann; Gabriele Schmidl; Daniel Eckardt; Alfons Burkert; Juergen Roeper; Malte Schwerin

doi:10.1117/12.507066

10 November 2003 Two-dimensional concentration and temperature measurements in extended flames of industrial burners using PLIF

Dirk Mueller, Wolfgang Triebel, Arne Bochmann, Gabriele Schmidl, Daniel Eckardt, Alfons Burkert, Juergen Roeper, Malte Schwerin

Author Affiliations +

Proceedings Volume 5191, Optical Diagnostics for Fluids, Solids, and Combustion II; (2003) https://doi.org/10.1117/12.507066
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Concentration profiles of OH, O₂ and NO as well as temperature fields in diffusion flames of a length of approx. 300 mm and 40 mm in diameter used for gas-phase synthesis of fused silica have been determined by Planar Laser Induced Fluorescence (PLIF). The measurements have been carried out using a tunable spectrally narrowed KrF laser, whose wavelengths could be switched pulse-to-pulse. The laser beam was shaped as a light sheet into the flame at a fixed position. The flame area under investigation was monitored by moving the burner mounted on a stepper motor. By adapted synchronization the laser induced fluorescence was continuously recorded over the height of the flame perpendicular to the laser light sheet with an intensified CCD camera (10 fps, 8 bit dynamic range, 768 x 576 pixels). By image processing the spatial offset between images was corrected and superposed images were averaged and analyzed. This method allows to investigate the flame by recording 2D-fluorescence images including an automatic correction of intensity inhomogeneities of the laser light sheet. Based on the excited radical or molecule the fluorescence images were used to determine concentration and temperature distributions to build up a 2D-map of the flame. The PLIF experiment was calibrated with precise determination of the temperature at one coordinate of the flame by Spontaneous Vibrational Raman Scattering (VRS) of N₂. As a result temperatures up to 3200 K could be determined with an accuracy better than 3% and a spatial resolution better than 1 mm. Temperature variations in the flame at different gas flows of fuel and oxidizer could be monitored sensitively. Also, the influence of different carrier gases like N₂, Ar and He on the temperature distribution was investigated. Fluctuations in gas flow caused by turbulence could be monitored as well.

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Dirk Mueller, Wolfgang Triebel, Arne Bochmann, Gabriele Schmidl, Daniel Eckardt, Alfons Burkert, Juergen Roeper, and Malte Schwerin "Two-dimensional concentration and temperature measurements in extended flames of industrial burners using PLIF", Proc. SPIE 5191, Optical Diagnostics for Fluids, Solids, and Combustion II, (10 November 2003); https://doi.org/10.1117/12.507066

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