The Design Of Long-distance Fin-stability Projectile Based On Flow Field Numerical Simulation

This thesis analyze the current status and tendency of the muzzle of gun flow-field theory both here and abroad.the numerical simulation method and fundamental characteristics of muzzle of gun flow field the fundamental characteristics are introduced.by modelling muzzle of gun flow field of 7.62mm rifle,use non-structure moving mesh technique,and put the turbulence in the model.the result which are approximately consistent with the experiment photos,show clearly establishment of muzzle of gun flow field.besides,the muzzle of gun flow field which contains moving boundary on certain medium caliber artillery is calculated,and the foundation for the unfold motion analysis of the fin is gotten.By analyzing the features and characters of various kinds of super-caliber stabilized assembly of fin-stabilized projectile domestic and abroad, On the basis of the structural analysis make use of the gas ejection period two-dimension muzzle of gun muzzle of gun flow-field theory to produce the new way of gas ejection period unfolding fin.A kind of new type fin stabilization structure which fits the long-distance projectiles are designed. The structure of the stabilizer is analysed ,and the strength,aerodynamic force and stability of the stabilizer are calculated. By using two dimensional flow field theory to analyze unfold movement of the fin,the results prove the fin construction design scheme is feasible.In conclusion,the numerical simulation of exterior trajectory flow field on long-distance fin-stability projectile is taken. the results proved that the influence of the angle of attack and Mach number on flow field when the projectile is flying,is consistent with the theory.The exploring work for exterior trajectory numerical implementation of projectile, especially for fin-stability projectile are done,offerring the reference to projectile as well as fin-stability device's design.