热科学学报（英文版）2006，Vol.15Issue(2)：186-192,7.
Effect of Turbulence on Flame Propagation in Cornstarch Dust-Air Mixtures
Effect of Turbulence on Flame Propagation in Cornstarch Dust-Air Mixtures
摘要
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. Themeasured 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.关键词
dust flame/flame propagation/dust dispersion process/turbulence/cornstarchKey words
dust flame/flame propagation/dust dispersion process/turbulence/cornstarch分类
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Shuangfeng WANG,Yikang PU,Fu JIA,Artur GUTKOWSKI..Effect of Turbulence on Flame Propagation in Cornstarch Dust-Air Mixtures[J].热科学学报（英文版）,2006,15(2):186-192,7.基金项目
The work reported here was sponsored by the Knowledge Innovation Major Project of Chinese Academy of Sciences (CAS) under grant number KJCX2-SW-L05. The authors wish to thank Prof. J. Jarosinski, Technical University of Lodz,Poland, for helpful discussions and criticism. One of the authors, A. Gutkowski, was financially supported by the Marie Curie Transfer of Knowledge Project (grant No. ECHIRA NR 509849) during his stay at the National Microgravity Laboratory, CAS. （CAS）
