Effect of turbulence on flame propagation in cornstarch dust-air mixtures |
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Authors: | Shuangfeng Wang Yikang Pu Jia Fu Artur Gutkowski |
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Affiliation: | (1) National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080, China;(2) Department of Heat Technology and Refrigeration, Technical University of Lodz, Stefanowskiego 1/15, 90-924 Lodz, Poland |
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Abstract: | Following the quantitative determination of dust cloud parameters, this study investigated the flame propagation through cornstarch
dust clouds in a vertical duct of 780 mm height and 160×160 mm square cross section, and gave particular attention to the
effect of turbulence on flame characteristics. The turbulence induced by dust dispersion process was measured using a particle
image velocimetry (PIV) system. Upward propagating dust flames were visualized with direct light and shadow photography. The
results show that a critical value of the turbulence intensity can be specified below which laminar flame propagation would
be established. This transition condition is about 10 cm/s. The measured propagation speed of laminar flames appears to be
in the range of 0.45–0.56 m/s, consistent with the measurements reported in the literature. For the present experimental conditions,
the flame speed is little sensitive to the variations in dust concentration. Some information on the flame structure was revealed
from the shadow records, showing the typical heterogeneous feature of dust combustion process.
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Keywords: | dust flame flame propagation dust dispersion process turbulence cornstarch |
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