caa a22 4500 606198644 CHVBK 20210128100935.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00348-015-1965-z doi (NATIONALLICENCE)springer-10.1007/s00348-015-1965-z Laser diagnostics of pulverized coal combustion in O2/N2 and O2/CO2 conditions: velocity and scalar field measurements [Elektronische Daten] [Saravanan Balusamy, M. Kamal, Steven Lowe, Bo Tian, Yi Gao, Simone Hochgreb] Optical diagnostic techniques are applied to a 21kW laboratory-scale pulverized coal-methane burner to map the reaction zone during combustion, in mixtures with varying fractions of O2, N2 and CO2. Simultaneous Mie scatter and OH planar laser-induced fluorescence (PLIF) measurements have been carried out to study the effect of the oxidizer/diluent concentrations as well as the coal-loading rate. The spatial distribution of soot is captured using laser-induced incandescence (LII). Additionally, velocity profiles at selected axial locations are measured using the pairwise two-dimensional laser Doppler velocimetry technique. The OH PLIF images capture the reaction zones of pilot methane-air flames and the variation of the coal flame structure under various O2/CO2 compositions. Coal particles devolatilize immediately upon crossing the flame interface, so that the Mie scatter signal almost vanishes. Increasing coal-loading rates leads to higher reaction rates and shorter flames. LII measurements show that soot is formed primarily in the wake of remaining coal particles in the product regions. Finally, differences in the mean and RMS velocity field are explained by the combined action of thermal expansion and the changes in particle diameter between reacting and non-reacting flows. The Author(s), 2015 Balusamy Saravanan Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut Kamal M. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut Lowe Steven Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut Tian Bo Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut Gao Yi Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut Hochgreb Simone Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut Experiments in Fluids Springer Berlin Heidelberg 56/5(2015-05-01), 1-16 0723-4864 56:5<1 2015 56 348 https://doi.org/10.1007/s00348-015-1965-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1965-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Balusamy Saravanan Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut NATIONALLICENCE 700 1- Kamal M. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut NATIONALLICENCE 700 1- Lowe Steven Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut NATIONALLICENCE 700 1- Tian Bo Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut NATIONALLICENCE 700 1- Gao Yi Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut NATIONALLICENCE 700 1- Hochgreb Simone Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, UK aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/5(2015-05-01), 1-16 0723-4864 56:5<1 2015 56 348