Aerodynamic and Stability Optimization of Portable Trajectory-Correction Extension for Dual-Spin Supersonic projectile

In this paper, a new portable plugin extension has been designed and optimized, which can be installed on dual-spin projectiles. The aerodynamic and dynamic stability effects of this plugin extension have been investigated in such a way that byincreasing its performance, it is possible to modify the projectile path by the optimal extension. This portable device with four canards mounted on the projectile's non-rotating part can increase the torque coefficient and correct the projectile path. Initially, to achieve the design parameters, various simulations were performed, and the effects of several parameters on the aerodynamics and stability of the projectile were studied. Adjusting to real conditions of Mach 2 to 3 and at the attack angles of 0 and 2 degrees, the projectile was simulated with the new add-on, and the results were compared with that of the projectile without any extensions. By defining the design variables and objective functions in terms of aerodynamics and stability, the optimization of this plugin extension with canard was investigated by the response surface method (RSM). In the first phase of optimization, dynamic and gyroscopic stabilities were mentioned as response functions, and rotational power was chosen in the next phase of the study. As a result, the projectile's stability was investigated with a new optimized extension, and the optimum add-on system displayed excellent aerodynamic capabilities. Although the new plugin device leads to a slight increase in the projectile instability, the stability conditions are still fully met, and the optimized plugin extension can be used in dual-spin projectiles.