Combustion tube studies of dust flame acceleration |
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Authors: | Yi-kang Pu Shan Hu Józef Jarosiński |
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Institution: | (1) Institute of Mechanics, Chinese Academy of Scieces, 100080 Beijing, P.R. China;(2) Institute of Aviation, Al. Krakowska 110/114, 02-256 Warsaw, Poland |
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Abstract: | A new pneumatic dispersion system for obtaining a good quality uniform dust suspension in a horizontal dust combustion tube
was developed. The effect of three different dispersion techniques on self-sustained dust flame acceleration in such a combustion
tube was examined. The importance of the dispersion quality in the test tube for maintaining a self-sustained dust flame acceleration
was demonstrated. A combustion tube for studies of flame acceleration in fine aluminum dust-air mixture and its transition
to detonation under industrial ignition conditions was constructed in the course of the present study. It consists mainly
of an initiation section and a test section. The initiation section must be equipped in a well-developed dispersion system
for creating a good dispersion condition in the test tube. The length of this section is 3 meters. The test tube requires
only to distribute uniformly the dust over the bottom of the tube prior to the experiment. The aluminum dust spherical in
shape with 6 μm in diameter was used for tests. Experimental results demonstrated that the increase in flame velocity is roughly
linear through the entire length of the test tube. The highest flame propagation velocity in fine aluminum dust-air mixture
approaches some 1200m/s at a distance of 4.8m from the ignition plane. |
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Keywords: | dust flame acceleration transition to detonation dust explosion |
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