滚转运动对乘波飞行器气动特性的影响

 乘波飞行器运动过程中的非定常气动特性是高超声速飞行中的重要物理问题之一。采用数值模拟方法模拟了乘波飞行器在固定迎角下绕其对称轴强迫滚转运动这一过程。比较了在不同频率和滚转角下乘波飞行器的气动特性。计算格式采用AUSM类格式中最新的AUSM+up格式。计算结果表明：AUSM+up能很好地模拟飞行器滚转运动这一非定常过程；滚转运动时，所设计的乘波飞行器能使高压气体很好地附着在乘波飞行器下表面从而使其具有较好的气动特性；当频率较大时，乘波飞行器由于角速度的诱导作用会导致升力出现迟滞现象；做滚转运动时，滚转力矩小于零，产生正阻尼，乘波飞行器不会产生“摇滚”运动。

Effects of Rolling Movement on the Aerodynamic Characteristics of Waverider Aircraft

The unsteady aerodynamic characteristics of waverider aircraft is one of the most important physical problems in hypersonic flight.In this paper,the forced rolling movement about the symmetry axis at a fixed angle of attack is numerically simulated.The effects of different frequencies and rolling angles on the aerodynamic characteristics are also compared.The latest AUSM -up scheme of AUSM kind is also used in the simulation.The results indicate that the high-pressure air can well be attached to the undersurface of the waverider aircraft when the waverider aircraft is rolling.So the waverider aircraft designed by the authors has good aerodynamic characteristics.When the rolling frequency is high,the hysteresis of lift force appears because of the angular velocity inducement.When the waverider aircraft is rolling,the rolling moment is negative,which provides positive damping.The "wing rock" of waverider aircraft does not appear.