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中文摘要：
利用计算流体动力学（CFD）和动网格知识,针对某集束武器的三管并联发射建立三维模型,通过求解N-S方程,对三种不同情况下运动弹丸影响下的膛口流场结构进行数值计算。结果表明：流场发展与弹丸运动是一个相互影响的过程;叠加流场使弹丸产生的侧向合力是使弹丸射击精度下降的主要原因;当管间距相同时,加装制退器时两侧弹丸最大侧向速度仅为无制退器时的三分之二。
英文摘要：
The knowledge of CFD and dynamic mesh were applied to establish three-dimensional model for a parallel-firing cluster weapon and the N-S equation was calculated to simulate the structure of muzzle flow field influenced by high-speed projectile.In the simulation,the development of flow field and the projectile movement are mutual;The projectile side force produced by the complicated flow field is the main reason of the drop of firing precision.In the case of the same pitch,the largest side velocity of side projectiles（including muzzle brake） is the two-thirds of the one without it.
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