二维弹道修正榴弹动力平衡角与偏流特性分析

Analysis of Dynamic Equilibrium Angle and Ballistic Drift of Two-dimensional Trajectory Correction Projectiles with Fixed-canards

针对双旋结构旋转稳定榴弹的弹道特性进行研究。在固定舵和弹体无气动耦合的假设下,基于弹丸的运动方程和攻角方程,建立动力平衡角和偏流的解析表达式,并分析了各因素对动力平衡角和偏流的影响。仿真结果表明,舵片静力矩系数导数对动力平衡角影响较大,且随系数导数的增大动力平衡角减小;固定舵转速在一定范围内对偏流很大,并随转速增大而减小,转速大于该范围后,偏流受固定舵转速影响很小。该研究可用于弹丸的散布分析,为同类型弹丸的研究提供依据。

The reverse roll of fixed-canards of two-dimensional trajectory correction projectiles will inevitably affect ballistic characteristics, including dynamic equilibrium angle and ballistic drift values. Characteristics analysis was presented in this paper. Assuming that fixed- canard has no pneumatic coupling with the shell, equation of the attack angle was proposed, which was suitable for all projectiles with dual spin configuration. Then analytic formulas of the dynamic equilibrium angle and ballistic drift were deduced. By studying the formula, the influence factors for the characteristics were analyzed. The conclusion shows that the overturn moment aerodynamic deviation coefficient most greatly affects the angle, and the roll velocity of the canard affects the characteristic slightly.