气缸式尾翼弹发射过程气缸压力变化规律数值仿真

Cylinder Pressure Analysis of Cylinder-open Fin on Launch Process

通过研究气缸张开式尾翼弹的膛内及后效期时期气缸充放气过程,建立火药气体经过气缸气孔流动的理论模型,并结合尾翼弹的内弹道计算模型,得到了气缸压力随时间变化的数学模型。以某滑膛反坦克炮榴弹为例,仿真得到了气缸压力随时间变化曲线,分析气缸容积、气孔横截面积对气缸压力的影响规律。结果表明:在流量系数为0.9、小孔个数为2个、火药力为950000Nm/kg条件下,气缸容积取0.150dm3、小孔直径取1.6mm时尾翼稳定装置工作良好。

By studying process of cylinder-open fin sinflation and deflation in gun bore and after-effect period,a theoretical model of gunpowder gas through cylinder＇s air hole is set up. Using a calculation model of interior ballistics,a mathematical model of cylinder pressure with time change is proposed. Taking a smoothbore anti-tank grenade for example, the cylinder pressure-time curve is obtained and the law of cylinder pressure affected by cylinder volume and air hole cross-sectional area is analyzed. The results provide some theoretical basis for optimization of the structure of the open-style cylinder fin-stabilized.