Numerical investigation of detonator with shock focusing and flame implosion

作者：Chen, Xiang; Zhao, Ningbo^*; Zheng, Hongtao; Liu, Shizheng; Li, Zhiming

来源：Journal of Aerospace Power, 2018, 33(11): 2714-2724.

DOI：10.13224/j.cnki.jasp.2018.11.018

• Acceleration regions
• Deflagration to detonation transition
• Detonation initiation
• Flame implosion
• Geometrical structure
• Hot spot
• Numerical investigations
• Temperature and pressures

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.

• 出版日期2018
• 单位哈尔滨工程大学