Temporal and spatial distribution models of explosive cloud diffusionand their characteristics

In order to solve the problem of temporal and spatial distribution of explosive clouds, three groups of TNT explosion cloud field experiments were designed and carried out under the premise of strictly restricting the explosion conditions. The experiments obtained the spatiotemporal distribution of cloud under different experimental conditions. The diffusion process of the explosive cloud was simulated by computational fluid dynamics (CFD). By analyzing the space-time distribution data from the cloud experiments and simulations, the evolution process of the cloud and the information of the buoyancy flow field were obtained, and the diffusion height distribution models of different clouds were determined under the conditions of thick cement floor and hard ground. The results show that the combination of experiment and simulation can be used to characterize the spatial and temporal distribution model of the cloud. The cloud height of the explosion increases by 1/2 power function with time. The cloud width increases linearly with time in a short time. The temperature of the cloud attenuates in inverse proportion to time. The ground conditions for the detonation, and the shell thickness of the explosive device can affect the diffusion height of the explosive cloud in different degrees. © 2019, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.