Characteristics of Muzzle Flow Field of Large Caliber Gun Considering Chemical Reaction

doi:10.3969/j.issn.1000-1093.2021.08.006

Abstract

Abstract: The strong blast wave and muzzle flash generated during launching may damage the perssonnel or equipment and expose the launching position since large-caliber gun has complicated charging elements and a large amount of charge. The launch process of a 155 mm gun is simulated to study the characteristics of conditions of muzzle flow field, such as the formation of muzzle flash. A chemical reaction model is proposed, in which the characteristics of high speed, high pressure, high temperature and complex chemical reactions with environment during launching are considered. And also the Reynolds averaged Navier-Stokes equation and k-ε turbulence model are established by taking into account the small disturbance of projectile and barrel wall. The formation and evolution process of muzzle field after a projectile is discharged from the muzzle without considering the initial flow field are simulated and analyzed based on the established muzzle flow field model. The results of numerical analysis clearly show the complex wave system structures such as Mach disk, blast wave, and the generation of muzzle flash, especially the secondary flash. The results show that the calculated shape and size of fireball are in good agreement with the experimental results, and the error between the calculated and experimental results is no more than 8%.

Key words: muzzleflowfield, chemicalreactionmodel, turbulentmodel, overlappinggrid, numericalsimulation

CLC Number:

TJ012.2

WANG Danyu, NAN Fengqiang, LIAO Xin, XIAO Zhongliang, DU Ping, WANG Binbin. Characteristics of Muzzle Flow Field of Large Caliber Gun Considering Chemical Reaction[J]. Acta Armamentarii, 2021, 42(8): 1624-1630.

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