B炸药爆轰波拐角传播的三维数值模拟

Three Dimensional Numerical Simulation of Detonation Wave Propagation on Corner-turning of Composition B

为研究B炸药起爆后爆轰波在拐角中的传播特性以及拐角爆轰低压流场现象,运用LS-DYNA3D程序对120°,90°,45°三种特定的拐角装药的爆轰波传播现象进行了数值模拟,观察了爆轰波通过拐角的传播过程,讨论了爆轰波波阵面通过拐角后爆速的变化情况。结果表明,爆轰波通过拐角后由于传播面积的变化而产生衰减-增长过程,装药拐角越大,爆轰波通过时越稳定;随着装药拐角的减小,拐角处的波阵面压力、爆速和传播能力都逐渐降低。

In order to study the propagation characteristics of detonation wave and low pressure flow field in the corner-turning after the detonation of composition B,the numerical simulation program LS-DYNA3D has been used to simulate the detonation wave propagation phenomena of three specific corner-turning （120°, 90° and 45°） charge structures. The spread process of detonation wave through corner-turning is observed, changes of detonation velocity when wave front overpass the corner-turning are discussed. The results show that when the detonation wave spread at the corner-turning, an attenuation-growth process caused by the changes in the diffuse acreage is formed. The greater the corner-turnlng degree of charge, the more stable when detonation wave passed. With the reduction of the corner-turning degree, the wave front pressure, detonation velocity and ability of detonation of corner-turning all gradually decrease.