旋转弹锥形运动气动特性研究

Research on Aerodynamic Characteristic of Spinning Projectile in Coning Motion

为了探索旋转弹箭发生旋进、章动等运动现象时流场的变化,根据无控旋转弹所具有的二圆运动特性,建立了适用于CFD的描述刚体多轴角运动的表达式,结合非定常N-S方法,对Basic Finner作锥形运动的绕流场进行了数值模拟。结果表明在锥形运动中,随相位变化,弹体周期性的气动力出现改变,且角运动所引起的物面附近流动变化集中在尾部流动分离区域。当合攻角增大时,物面气动载荷随弹体相位变化出现的波动现象更具复杂性。

In order to explore the flow field variation of movements like precession and nutation of a rotating projectile,a mathematic description for CFD methods of multi-axes angular motion has been proposed according to its two-circle motion characteristics,the flow-field distribution around Basic Finner in conical motion is obtained by solving unsteady Navier-Stokes equations with the given expressions.The result shows that the regulation of periodic variation of aerodynamic force in different phases changes during conical motion.The flow separation at tail is more obvious.As the angular velocity and total angle of attack increases,the surface pressure distribution at different phases becomes more complicated.