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Effects of boundary layer on flame propagation generated by forced ignition behind an incident shock wave

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Abstract

To study the effects of the boundary layer on the deflagration to detonation transition (DDT) process, the mixture behind an incident shock wave was ignited using laser breakdown. Ignition timing was controlled so that the interaction of the resulting flame with a laminar or turbulent boundary layer could be examined. In the case of the interaction with a laminar boundary layer, wrinkling of the flame was observed after the flame reached the corner of the channel. On the other hand, interaction with the turbulent boundary layer distorted the flame front and increased the spreading rate of the flame followed by prompt DDT. The inner structure of the turbulent boundary layer plays an important role in the DDT process. The region that distorted the flame within the turbulent boundary layer was found to be the intermediate region \(0.01< y/\delta < 0.4\), where y is the distance from the wall and \(\delta \) is the boundary layer thickness. The flame disturbance by the turbulent motions is followed by the flame interaction with the inner layer near the wall, which in turn generates a secondary-ignition kernel that produced a spherical accelerating flame, which ultimately led to the onset of detonation. After the flame reached the intermediate region, the time required for DDT was independent of the ignition position. The effect of the boundary layer on the propagating flame, thus, became relatively small after the accelerating flame was generated.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    S. Ishihara, S. Tamura & K. Ishii

  2. Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan

    H. Kataoka

Authors
  1. S. Ishihara
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  2. S. Tamura
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  3. K. Ishii
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  4. H. Kataoka
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Correspondence to S. Ishihara.

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Communicated by G. Ciccarelli.

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Ishihara, S., Tamura, S., Ishii, K. et al. Effects of boundary layer on flame propagation generated by forced ignition behind an incident shock wave. Shock Waves 26, 599–609 (2016). https://doi.org/10.1007/s00193-016-0684-6

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  • DOI: https://doi.org/10.1007/s00193-016-0684-6

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