Researchon Aerodynamic Drag Reduction Method of Fin-Stabilized Projectile
In order to increase the range and striking range of fin-stabilized projectiles,the effects of sweepback angle and oblique angle on aerodynamic and trajectory characteristics were studied by aero-dynamic simulation and trajectory simulation calculation.For a fin-stabilized projectile with six tail fins,the effects of the sweepback angle and oblique angle on drag,lift,static stability and trajectory characteristics were analyzed by aerodynamic simulation.The results show that the drag is greatly af-fected by the configuration of tail fins,and the drag can be reduced effectively by increasing the sweep-back angle to a certain extent.When the oblique angle is small,the lift and static stability can be im-proved by increasing the sweepback angle.However,when the oblique angle is large,the lift and static stability may not necessarily be improved by increasing the sweepback angle.The area of the leading edge of tail fins and angle between the windward side and incoming flow should be considered when re-fining the sweepback angle and oblique angle to reduce the drag.The simulations show that the drag is reduced to 60%,the maximum firing height is increased by 30%and the range is increased by 40%under the 40° sweepback angle and 10° oblique angle.
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