ブンゼン火災の燃焼・排出特性に及ぼす一様磁場の影響 : 熱工学,内燃機関,動力など

概要

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A Bunsen type propane-air premixed laminar flame was formed within a vertical tube, of 51 mm inner diameter and 500 mm length, placed at the center of a super-conductive magnet generating a nearly uniform upward magnetic field of 5 T. It was observed how the magnetic field affected the flame contour and burning velocity as well as the distribution patterns of gas temperature and nitrogen oxides (NO and NO_2) concentrations in and around the flame. The influences of secondary factors, such as flame fluctuation, natural convection and the slight nonuniformity in the magnetic field, originating from the structure of the super conductive magnet, are overlaid on the direct effects of the magnetic field. Moreover, the former are more prominent than the latter. Careful investigation was, therefore, necessary to extract or separate the direct effects of the magnetic field from the indirect ones caused by the secondary factors. It appeared that the phenomena such as flame propagation, which were dominated by high-speed chemical reactions, were hardly affected by a magnetic field as intense as 5 T. It is probable that phenomena such as nitrogen oxide formation, which are dominated by low-speed chemical reactions, are slightly affected by the field.
一般社団法人日本機械学会の論文
2001-05-25