Abstract
To explore the postposition of the maximum pressure at the pole of the ellipsoidal end cover of cylindrical explosion containment vessels and to reveal the mechanism of the load evolution, the experimental method was used to measure the pressure curve at the pole under different charges, and the numerical simulation method was used to analyze the evolution law of the explosion flow field within the end cover. The results show that the end cover pole was subjected to three types of pressure: the primary explosion wave, the secondary shock wave and the convergence wave. In addition, the pressure peaks increased in sequence. The evolution of the flow field in the end cover was affected by the amount of charge and the aspect ratio of the vessel. When the scaled distance due to a small charge increased, or when the aspect ratio of the vessel was reduced, the time interval between the convergence wave and the secondary shock wave at the end cover pole decreased gradually. When the scaled distance increased to 4.05 m·kg−1/3, the convergence wave at the pole superimposed on the secondary shock wave. As the aspect ratio of the vessel ranged from 1.75 to 2.50, the time interval between the two peaks was about 150 μs. However, if the aspect ratio was less than 1.40, the convergence wave and the secondary shock wave were fused through complex interaction.
Highlights
As a limiting device for blast wave and explosion products, the explosion containment vessel has wide applications in both military and civil fields
To explore the postposition phenomenon of the maximum pressure at the end cover pole, and the internal load, vibration response, failure analysis and the design criteria of the explosion to reveal its load evolution mechanism, this paper introduced an experimental result on the pressure containment vessel
Based on previous numerical simulation studies [5,7], it was generally believed that the initial pressure stage at the end cover pole was divided into two parts: first, the explosion shock wave inside pressure stage at the end cover pole was divided into two parts: first, the explosion shock wave inside the charge was encountered at the pole and the reflected pressure was generated
Summary
As a limiting device for blast wave and explosion products, the explosion containment vessel has wide applications in both military and civil fields. The convergence effect shock waves, the maximum explosion in an and irregular confined blast They found thatofthe second pressure peak had a load high in intensity andarea even theand firstallpeak at gauges near the chamber wall or the corner. V. Pickerd et al [6], through experiments and numerical simulation, found that the second peak was impact steel was container, foundat that to the effect of shock muchexplosion higher than theload firstinside peak,the which on theand gauges thedue edge andconvergence corner of the cubic explosive waves, the maximum load occurred in the pole area of the dome and all occurred in the second or vessel. Experiment container, and the design of the anti-detonation strength of the explosion containment vessel
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