Calculation And Optimization Of Aerodynamic And Exterior Ballistics Characteristics Of Spinning Projectile

In the initial stage and final range test of the design of Projectiles, it had to calculate the aerodynamics and ballistic performance of the projectiles rapidly to get the better shape or the droppoint of projectile. To achieve both of the purposes, we studied on research and calculation of algorithm and made a optimal design for certain type of grenade.Axisymmetric projectiles flying in the while trajectory moves in respective elevations meteorological conditions, with different speeds (for instance, subsonic, transonic or supersonic) and different angles. Thus we should consider the influence of weather conditions. We split the projectile into fore part (the head and Cylinder part) and after part (tail and base part) in component combination method, then we studied the Engineering Methods in different speeds of every part of the projectile, at last we picked out a selective series of methods to calculate the aerodynamics of projectiles. We built 5D ballistic model, and tried to solve that differential equations with runge-kutta method. After that theory analysis works, we developed that two parts into genneral progress in Fortran95 which could be applied to projectiles to predict lift, drag, pitching moment, and center of pressure over the Mach number range,0.0<Ma<3.5. Then we calculated the aerodynamics of a certain type of grenade and contrasted the result with the experimental data in different speeds and different Angles of attack. It's proved that program was accurate enough to replace that of wind tunnel test. At last, we designed a optimal type of grenade in aerodynamics and ballistic performance with that program, optimization goal parameters included the shape of head, slenderness ratio and initial weight of the projectile.In the optimal design, the range of a certain type of grenade increased to a significant 17.53%. This program was verified to be appliable to projectiles to accurately predict aerodynamics and ballistic performance over the Mach number range,0.0<Ma<3.5. It could be used to select a better shape or get the droppoint of projectile rapidly.