Volume 33 Issue 11
Nov.  2018
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Numerical investigation of detonator with shock focusing and flame implosion[J]. Journal of Aerospace Power, 2018, 33(11): 2714-2724. doi: 10.13224/j.cnki.jasp.2018.11.018
Citation: Numerical investigation of detonator with shock focusing and flame implosion[J]. Journal of Aerospace Power, 2018, 33(11): 2714-2724. doi: 10.13224/j.cnki.jasp.2018.11.018

Numerical investigation of detonator with shock focusing and flame implosion

doi: 10.13224/j.cnki.jasp.2018.11.018
  • Received Date: 2017-07-19
  • Publish Date: 2018-11-28
  • In order to solve the problem of shock wave initiation within a short range, a flame focusing structure with a shock wave focusing flame was designed, and the flow field inside the structure was studied by numerical simulation. Results showed that the acceleration region was an important region for the acceleration of flame instability, and the local energy explosion caused by the energy convergence in the focusing region was the key factor for the acceleration of deflagration to detonation transition. In this region, the vortex induced by the geometrical structure can enhance the focusing and hinder the shock wave back into the accelerating region. The transition region of the detonation wave from the over driving state to the stable detonation state was mainly realized in the stable region.The temperature and pressure fluctuations on the central axis were caused by the focusing action of the focusing cavity, and the temperature and pressure changes of the detonation front were caused by the three wave point motions.

     

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