Scale effect of porous mesh on the inhibition mechanism of wheat dust flame |
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Authors: | Nan Xue Dai Huaming Chen Xianfeng Zhao Qi Wang Xiaotong |
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Institution: | 1.School of Safety Science and Emergency Management, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China ;2.Department of Engineering Physics, Institute of Public Safety Research, Tsinghua University, Beijing, 100084, China ; |
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Abstract: | The combustible features of wheat dust easily induce a potential hazard in its processing and application. To clearly reveal the effects of porous mesh parameters on the flame propagation of wheat dust, a vertical combustion pipeline together with the data collecting by the high-speed photography and fine thermocouple was built. Results indicate that with the increase in the mesh scale, the dust combustion and peak temperature are intensified first and then decreased with a darker luminescence. The increasing mesh number shows an inhibition effect on both peak temperature and combustion pressure, but an accelerating first and then weakening effect on flame velocity. A smaller particle size contributes to a more complete combustion, causing a higher peak temperature and flame velocity. At the particle mass of 2.5 g, the maximum value of peak temperature, flame velocity and combustion pressure were obtained during the flame propagation. |
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