Detonation diffraction in combustible high-speed flows

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• 作者：Mingyue Gui ; Baochun Fan ; Baoming Li
• 关键词：Detonation diffraction ; High ; speed flows ; Re ; initiation ; WENO scheme
• 刊名：Shock Waves
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：26
• 期：2
• 页码：169-180
• 全文大小：3,069 KB
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• 作者单位：Mingyue Gui (1) (2)
  Baochun Fan (1)
  Baoming Li (1)
  
  1. Key Laboratory of Transient Physics, Nanjing University of Science and Technology, No. 200, Xiaolingwei, Nanjing, 210094, Jiangsu, China
  2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics, Fluids and Thermodynamics
  Fluids
  Thermodynamics
  Acoustics
  Condensed Matter
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2153

文摘

Detonation propagating in a T-shaped tube with quiescent and moving hydrogen/oxygen/argon mixtures is numerically examined based on the Euler equations with detailed finite-rate chemistry using the fifth-order weighted essentially non-oscillatory scheme. When diffracted in a quiescent combustible mixture, the detonation wave propagating from the bottom of the T-shaped tube is influenced by the corner rarefaction waves and decays into a non-reacting shock. Subsequently, the decoupled shock reflects irregularly from the top wall. Through several reflections back and forth between the top and bottom walls, a planar detonation is finally re-established. When the combustible mixture in the horizontal part flows from the left to the right, the detonation products ejected from the vertical tube will retard the flow, generating a compression flow upstream and a rarefaction flow downstream. The disturbed detonation on the left side is stronger than that on the right side. The final planar detonation in the upstream direction propagates faster than the Chapman–Jouguet (CJ) detonation with compressed, fine cellular structures, whereas the detonation in the downstream direction propagates more slowly than the CJ detonation with elongated, coarse cellular structures. The details of the transient behavior of diffracting detonation in high-speed flows are discussed.