NDLI: Mechanism of deflagration-to-detonation transitions above repeated obstacles

Content Provider	Springer Nature Link
Author	Obara, T. Kobayashi, T. Ohyagi, S.
Copyright Year	2012
Abstract	Experiments are carried out to investigate the mechanism of the deflagration-to-detonation transition (DDT). Because, this mechanism has relevance to safety issues in industries, where combustible premixed gases are in general use. A stoichiometric gas of oxygen and hydrogen (oxy-hydrogen) is ignited in a tube, repeated obstacles are installed, and the DDT behaviours are visualized using a high-speed video camera. The pitch and height of the repeated obstacles and the initial pressure of the oxy-hydrogen premixed gas are varied in an attempt to obtain the optimum conditions that cause DDT a short distance from the ignition source. The experiments identified DDT as being essentially caused by one of the following mechanisms: (1) A deflagration wave is accelerated in terms of a vortex, which is generated behind the obstacle, and the flame acceleration induces a secondary shock wave. Eventually, the shock–flame interaction ahead of the obstacle causes DDT via a very strong local explosion. (2) Each shock wave generated by relatively weak local explosions between the obstacles is not sufficient to cause DDT directly, but DDT results from an accumulation of shock waves. The detonation induction distance is also examined, taking into account the physical and chemical parameters of the obstacles and the oxy-hydrogen premixed gas.
Starting Page	627
Ending Page	639
Page Count	13
File Format	PDF
ISSN	09381287
Journal	Shock Waves
Volume Number	22
Issue Number	6
e-ISSN	14322153
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-09-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Deflagration-to-detonation transition Detonation induction distance Shock wave Local explosion Obstacle Condensed Matter Physics Thermodynamics Fluid- and Aerodynamics Acoustics Engineering Fluid Dynamics Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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