Research on Numerical Simulation Method of Near-field Flows in Air Blast

doi:10.3969/j.issn.1000-1093.2012.05.010

Abstract

Abstract: A new method of simulating the explosion flowfield due to the interaction of explosives, detonation products and air was proposed. A mixing model of explosives, detonation products and air was introduced in Eulerian method. In this model, Jones-Wilkins-Lee(JWL) state equation was used for the explosives and products, while a prefect gas state equation was used for air; an equilibrium pressure assumption was made between explosives and products, while an equilibrium temperature assumption was made between products and air; no iteration is required in this model, so a high efficiency is achieved. An ignition and growth model was used to calculate the chemical reactivity, and AUSM₊-up scheme was used to calculate the convection flux. The explosion of spherical TNT explosives in air was calculated, and a series of complex interactions, such as transmission and reflection, between detonation wave and fluid interface were observed. The calculated peak over-pressure accords well with experimental results even at 5 cm from the explosive surface. The arriving time of blast wave and the specific impulse of overpressure also accord well with the existing experimental results, which validates the availability and accuracy of the method.

Key words: mechanics of explosion, condensed explosive, Eulerian method, near-field, air blast

CLC Number:

O381

XU Chun-guang， BAI Xiao-zheng ， LIU Yu ， LIU Jun. Research on Numerical Simulation Method of Near-field Flows in Air Blast[J]. Acta Armamentarii, 2012, 33(5): 566-573.

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