摘要
为提高武器精度,模拟弹丸射入膛内后的膛口流场,耦合内弹道过程分析弹丸射出炮口前的初始流场和射出后的流场变化。采用内弹道经典模型计算膛内弹后气体流场,建立二维轴对称气体动力学模型计算弹前气体及膛口流场,通过弹前阻力将二者同步耦合计算。计算过程采用非结构网格方法,同时考虑运动弹丸的影响,计算结果与实验流场相吻合。计算结果捕捉到弹丸出炮口后在膛口形成清晰的瓶状波系。分析得到弹丸出炮口后1.5 ms时刻炮膛内外的马赫数轴向分布;此时火药气体在膛外膨胀的最大马赫数可以达到6.32;火药经过激波后气体速度迅速下降到声速以下。由于激波的作用,在激波前后压强会产生阶跃。
The muzzle flow fields after projectiles are driven inside guns are simulated to enhance firing precision. Coupled with interior ballistics process, the initial flow field and the flow field change before and after the projectile shoots out are analyzed. The classical model of interior ballistics is established to simulate the gas in bore, and an aerodynamic model of two dimension and axially symmetry is established to simulate the muzzle flow field. The two models are coupled by the resistance of the pressure in front of the projectile. The influence of the moving projectiles is also considered in simulating process by use of the method of unstructured grids. The numerical results are in good agreement with the experimental ones. Shockwaves of muzzle flow fields are obtained cleanly. Conclusions are drawn through simulations as follows：axial mach number distribution at the time 1.5 ms after the projectile fly out of muzzle is obtained ; the maximum roach number is 6.32 at that time ; the velocity of powder gas decreases to the subsonic after shockwaves. The pressure simuhane-ously has step offsets when shockwaves operate.
出处
《南京理工大学学报》
EI
CAS
CSCD
北大核心
2009年第3期335-338,343,共5页
Journal of Nanjing University of Science and Technology
基金
教育部优秀人才支持计划(NCET040509)
高校博士学科点基金(20060288019)
江苏省自然科学基金(BK2007531)
关键词
膛口
流场
内弹道
非结构网格
耦合
弹丸
gun muzzles
flow fields
interior ballistics
unstructured grids
coupling
projectiles
