Aerodynamic Characteristics Analysis And Drag Reduction Design Of High-Speed Projectile Groups

With the development of modern anti-aircraft naval gun technology,the velocity of the multi-tube rapid projectile increases greatly,which results in a large pressure drag in the flight process,and reduces the flying speed and effective range of the projectile.And how to reduce the resistance of the high-speed rapid-fire projectile to increase the range of the projectile has an important reference value for engineering design.The research focused on the drag reduction of the aerospike installed on the head of the projectile,numerous numerical simulations have been carried out for different situations based on solving the RANS equations.For single projectile,we discuss the flow fluid structure and effect on the drag reduction by four different length,three different head shape of the aerospike and four different flow angel of attack.For the projectile group,the parameters we studied included five paralleling spacing and six series spacing of the projectile group under the given areospike,we carried out lots of numerical simulation,figured out the characteristics of the flow field structure and the drag distribution of the projectile group.And then we put forward a reasonable aerodynamic drag reduction proposal and verify the effect of the drag reduction effect based on the simulations.At last,we discuss the influence by the chemical non-equilibrium effect on single and paralleling projectile.The research shows that the effect of drag reduction differ from different head aerospike type,and the effect of the drag reduction is more and more obvious with the increasing of the length of the areospike for the single projectile.For the projectile group,the drag reduction effect is related to the spacing of the projectiles.For the specific configuration of the aerospike,there is a reasonable series and parallel spacing so that the overall value of drag is the minimum.The conclusion of this research will provide the reference value for the design of the rapid-fire multi-tube weapon system.