不同引信头部外形参数对弹丸气动力的影响

Influence of Fusehead Profile Parameters on Aerodynamic Characters of Projectiles

为提高弹丸射击质量，采用LU隐式差分格式求解三维Navier—Stokes方程，对后体形状完全相同，具有不同引信头部外形参数的两种弹丸进行了数值模拟，得到了两者在马赫数0．7—3．0下的诸气动力参数和气动力特性的差异，并分析了产生的原因。计算结果表明：在弹丸设计过程中，应充分考虑引信结构、外形对弹丸气动力特性的影响，避免采用具有拐点的母线形状。

In order to improve the projectile shooting quality, two kinds of projectiles with the same body and different fusehead configurations are simulated numerically by applying the LU implicit difference scheme in solving the generalized three-dimensional Navier-Stokes equations. The aerodynamic coefficients and the aerodynamic character differences of projectiles are obtained while Mach number varies from 0.7 to 3.0, and the cause is analyzed. The calculation results indicate that the influence of fusehead configuration and profile on its projectile aerodynamic characters should be adequately considered in the design process. The generatrix with inflexion should be avoided.