Volume 26 Issue 7
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QIN Ya-xin, GAO Ge. Numerical simulation and experimental study on flame acceleration and deflagration to detonation transition[J]. Journal of Aerospace Power, 2011, 26(7): 1488-1494.
Citation: QIN Ya-xin, GAO Ge. Numerical simulation and experimental study on flame acceleration and deflagration to detonation transition[J]. Journal of Aerospace Power, 2011, 26(7): 1488-1494.
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Numerical simulation and experimental study on flame acceleration and deflagration to detonation transition

  • National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Jet Propulsion,Beijing University of Aeronautics and Astronautics, Beijing 100191,China

  • Received Date: 2010-06-30
  • Rev Recd Date: 2010-12-08
  • Publish Date: 2011-07-28
    Abstract
  • Numerical simulations and experimental study in a detonation duct with orifice plates were carried out to study the phenomena of flame acceleration and the evolutions of deflagration to detonation transition (DDT) and unstable detonation to stable detonation.The results of numerical simulation show that laminar flame is generated by low energy ignition in detonation duct.The laminar flame becomes turbulent flame in the obstruction of orifice plate and under the acceleration action of shock waves and reflected waves.The turbulent flame is strengthened mutually with its induced shock waves.After a few orifice plates,"hot spots" appear between the flame and the sharp shock wave,and then detonate the unburned mixture.Triple-point is formed in the evolution of weak detonation to stable detonation when detonation wave meets orifice plates.The evolution of Mach-pole to incident wave transition was also analyzed.The detonation initiation distances at different equivalence ratios were studied contrastively.Through calculation and analysis,deep understanding of flame acceleration and DDT were obtained,providing useful information for further experiment.

     

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