Simulation Study of Screening Efficiency of Explosive Smoke Bomb

doi:10.3969/j.issn.1000-1093.2020.07.006

Abstract

Abstract: Gauss model or Rachtman diffusion theory that assumes uniform and stable wind field is usually involved in traditional methods of smoke simulation. However, these methods neglect the complex characteristics of the actual atmosphere. To solve this problem, a screening efficiency simulation model for smoke bomb is established based on computational fluid dynamics (CFD) in this paper. The model uses Lagrange method to construct the initial smoke cloud by randomly generating particles. The thermal effect of combustion heat release is analyzed, and the dispersion of smoke is simulated to obtain the temporal and spatial distribution of smoke mass concentration based on CFD method and discrete phase model. Furthermore, the effective shading region of smoke to visible light is obtained by means of calculation of smoke surface density. Lastly, compared with the experimental and Rachtman model results, the validity of the model is confirmed. It is shown that the proposed model well reflects the variation of smoke shape, length and height in the early diffusion stage of explosive smoke bomb. Key

Key words: explosivesmokebomb, screeningefficiencysimulation, computationalfluiddynamics, initialsmokecloud, smokesurfacedensity

CLC Number:

TJ413⁺.7

XU Lucheng， HAO Xueying， XIAO Kaitao， SONG Weiwei， CHEN Chunsheng. Simulation Study of Screening Efficiency of Explosive Smoke Bomb[J]. Acta Armamentarii, 2020, 41(7): 1299-1306.

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兵工学报ACTA ARMAMENTARII
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