鸭舵转速对双旋弹追随稳定性影响研究OA北大核心CSTPCD

A high-fidelity computational fluid dynamics and rigid-body dynamics coupling platform suitable for virtual flight simulation of dual-spin projectile is developed.Based on this platform,the influence of rotating canards on the trajectory following stability of the dual-spin projectile is studied.To accurately characterize the differential rotation effect of the dual-spin projectile's fore and aft bodies,a slidingmesh algorithm is introduced into the in-house unstructured mixed grid flow field numerical simulation program HUND3D.By conducting axi-symmetric rotational unsteady simulations of the dual-spin projectile and investigating the flow characteristics and aerodynamic properties under different canard rotation speeds,the dynamics mechanism of the trajectory follow-ing process is analyzed.Through the coupled solution of unsteady Reynolds-averaged Navier-Stokes equations and seven-degree-of-freedom rigid-body dynamics equations,virtual flight simulations of the dual-spin projectile with different curvature trajectories are realized.The dynamic mechanism of the trajectory tracking process is an-alyzed,and strategies for improving trajectory following stability by controlling the canard rotation speed based on the analysis of aerodynamic characteristics are studied.The research results indicate that the aerodynamic disturbances generated by canard rotation can significantly affect the lateral force and yawing moment of the pro-jectile.By controlling the rotation speed of the fore canards to produce a yawing moment favorable for trajectory tracking,the trajectory following stability can be improved to a certain extent.