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Acta Armamentarii ›› 2021, Vol. 42 ›› Issue (12): 2575-2585.doi: 10.3969/j.issn.1000-1093.2021.12.005

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Multi-objective Optimization of Aerodynamic Shape of Microspoiler for Spin-stabilized Projectile

QIAN Long1, CHANG Sijiang1, NI Yi2   

  1. (1.School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;2.Shanghai Institute of Mechanical and Electrical Engineering,Shanghai 201109,China)
  • Online:2022-01-15

Abstract: In order to improve the shooting accuracy of a spin-stabilized projectile,a microspoiler is used for the spin-stabilized projectile to provide lateral lift for the projectile,thus changing the projectile body attitude and achieving the purpose of changing the flight trajectory. Through the numerical simulation method,the axial force coefficient,normal force coefficient and static moment coefficient of microspoiler are calculated,the change of the aerodynamic coefficient of microspoiler with the shape parameters and Mach number is analyzed,and the influences of shape parameters and Mach number on the equilibrium angle of attack are analyzed. A multi-objective optimization design model is established. In the proposed model, the main shape parameters of microspoiler are used as design variables,the trajectory correction and the terminal remaining speed are taken as the optimiztion targets,and the angle of attack,correction ability,spoiler size and other constraints are considered. The genetic algorithm is used to obtain global optimal solution. The results show that the method of using the microspoiler to adjust the projectile's attitude and trajectory is feasible and effective;there is an optimal solution for the lift-to-drag ratio in the shape parameters of microspoiler in the sub-transonic range,and the lift-to-drag ratio decreases with the increase in Mach number at supersonic speed.

Key words: spin-stabilizedprojectile, microspoiler, aerodynamiccharacteristics, multi-objectiveoptimization

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