摘要
本文使用严格二维的FCT算法数值模拟美国M—16 5.36毫米自动步枪的非定常的轴对称膛口流场。用此方法不仅可得到膛口冲击波的发展过程,而且可得到不少数值方法不易得到的马赫盘的发展过程。本文计算结果与Schmidt的实验结果作了比较,二者吻合较好。这一结果为进一步开展更复杂(考虑弹丸、膛口制退器等)的膛口流场的数值模拟奠定了基础。
The numerical simulation of muzzle flowfield including Mach disc and muzzle blast wave is the object of this investigation. The existence of Mach disc was often not easy to be detected by the numerical methods used in the past. FCT (Flux-Corrected Transport) method was provided by Boris and Bood, its basic idea is to add sufficently strong diffusion to any convective scheme to ensure positivity, its an-tidiffusion step removes the excess diffusion for stability requirement. Such method of positivity preservation is superior to traditioal methods, especially when strong shock exists. This paper adopts a fully two-dimensional FCT method improved by Zalesak to numerically simulate the unsteady axisymmetrical muzzle flowfield without muzzle devices, and presents the computational results of the development process of Mach disc and blast wave in muzzle flow at the early stage of exhausting process for a USA M-16 5.56mm rifle. The location and shape of the Mach disc and the bottle shock could be clearly recognized from the diagrams of isobar and velocity vector. The numerical results are in good agreement with those of the Schmidt's experiment Such results are encouraging, and have made helpful preparation for developing more complex numerical simulation of muzzle flowfield ( considering projectile, muzzle devices and so on).
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
1989年第3期254-260,共7页
Explosion and Shock Waves
关键词
膛口
流场
模拟
冲击波
numerical simulation, blast wave, muzzle flowfield.