非圆截面结构抛撒稳定性数值模拟

为分析初始速度、初始偏转角与质心位置对非圆截面结构抛撒稳定性的影响,利用Fluent程序,对结构在抛撒过程中的质心轨迹与旋转角进行了数值研究. 结果表明:质心径向的最终旋转角随初始抛撒速度的增加呈负指数衰减;在不同结构攻角条件下,质心径向和轴向旋转角均随着初始轴向偏转角的增加而减小,且质心径向偏转角降低速率相对较慢;结构攻角的增加在加剧径向偏转量的同时,削减了轴向偏转量;结构初始攻角与径向的偏转对质心轴向旋转影响不明显.

Simulation on Dispersal Stability for Non-Circular Cross-Section Structure

To analyze the effect on dispersion stability of non-circular cross-section projectile, using Fluent program, the centroid trajectory and rotation angle during projectile dispersion were studied numerically. The results show that the final rotation angel of centroid radial direction decreases as negative exponential function, when initial dispersion velocity increases. With different attack angle of projectile, centroid radial and axial rotation angle decreases when the initial axial deflection angle increases. And the reduce rate of centroid radial deflection angle is slower relatively. An addition of angle attack increases radial deflection but reduces of axial deflection. The effect of trajectory attack angel and radial rotation is not obvious on centroid axial rotation.