平头射弹前体参数对弹道稳定性及射程的影响

The influences of forebody parameters on the trajectory stability and range of supercavitating projectile are studied in the paper. A high efficiency coupling method of flow field and trajectory is established based on modal dynamics, a quantitative evaluation method for the trajectory stability and efficient range of supercavitating projectile during tail-slapping is proposed, and the simulated cavity shape and tail-slapping trajectory are validated. On this basis, the change law of trajectory stability and range of the projectiles with different lengths and diameters of forebody are analyzed. Results show that the trajectory stability increases with the increase in the diameter and length of forebody, and the trajectory instability mode can be divided into direct instability and oscillate instability. With the increase in diameter, the maximum range increases at first and then decreases, the maximum range is 3.8 times of the minimum range in the design domain, which means the forebody parameters have a relatively large influence on the range of projectile.