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Flame Interaction with Obstacles

  • Nickolai M. RubtsovEmail author
Chapter
Part of the Heat and Mass Transfer book series (HMT)

Abstract

It was shown that spark-initiated flames of hydrogen air mixtures (8–15 % Н2) pass through the close-meshed aluminum spherical obstacles with cell size 0.04-0.1 mm2; the flame of 15 % Н2 in the air after obstacle is accelerated; acoustic gas fluctuations occur in the reactor. The flame of 8 % natural gas–air mixture is not accelerated after obstacle; acoustic fluctuations are missing. It was shown that active centers of methane and hydrogen combustion, determining flame propagation, have different chemical nature. It was shown that spark-initiated flames of diluted stoichiometric natural gas–oxygen mixtures in close-meshed aluminum spheres with mesh size 0.1–0.2 mm2 do not propagate through the spheres, but always propagate through planar meshed obstacles of the same mesh size. It was found that the features of flame propagation at simultaneous initiation at opposite butt-ends of the cylindrical reactor differ markedly from those at initiation from a single discharge. It is shown that the increase in warming up in hydrocarbons сombustion at simultaneous initiation at opposite butt-ends of a cylindrical reactor by a factor of ~ 2 as compared to flame propagation from a single initiation source is due to two-stage nature of the combustion process. It was shown that ignition of diluted methane–oxygen mix (total pressure up to 200 Torr) after a single obstacle can be observed markedly far from an obstacle surface. The use of the meshed sphere as an obstacle leads to increase in the distance of flame emergence behind an obstacle in comparison with a round opening; two or more close-meshed obstacles strongly suppress flame propagation. It is experimentally shown that under the same conditions the limit of penetration of diluted methane oxygen flame through a confuser is markedly less than in the case of a plain orifice and is even less than in the case of a diffuser. Therefore, the diffuser is the most effective flame arrester.

Keywords

Flame Hydrogen Methane Oxidation Close meshed obstacles Plain orifice Diffuser Confuser Acceleration Compression 

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.Russian Academy of SciencesInstitute of Structural Macrokinetics and Materials ScienceMoscowRussia

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