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dc.contributor.authorBalusamy, Saravanan
dc.contributor.authorKamal, M. Mustafa
dc.contributor.authorLowe, Steven M.
dc.contributor.authorTian, Bo
dc.contributor.authorGao, Yi
dc.contributor.authorHochgreb, Simone
dc.identifier.citationBalusamy, S., Kamal, M.M., Lowe, S.M., Tian, B., Gao, Y. and Hochgreb, S., (2015). 'Laser diagnostics of pulverized coal combustion in O 2/N 2 and O 2/CO 2 conditions: velocity and scalar field measurements'. Experiments in Fluids, 56(5), pp. 1-16.en_US
dc.description.abstractOptical diagnostic techniques are applied to a 21 kW 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.en_US
dc.description.sponsorshipEngineering and Physical Sciences Research Councilen_US
dc.publisherSpringer Science and Business Media LLCen_US
dc.subjectCoal Particle, Bluff Body, Laser Doppler Velocimetry, Soot Formation, Laser Doppler Velocimetry Measurementen_US
dc.titleLaser diagnostics of pulverized coal combustion in O2/N2 and O2/CO2 conditions: velocity and scalar field measurementsen_US
dc.contributor.departmentUniversity of Cambridgeen_US
dc.identifier.journalExperiments in Fluidsen_US
dc.source.journaltitleExperiments in Fluids

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