80°后掠三角翼强迫俯仰、自由滚转双自由度耦合运动特性数值研究

Numerical investigation of the characteristics of double degree-of-freedom motion of an 80° delta wing in force-pitch and free-roll

耦合求解NS方程和刚体动力学方程数值研究了80°后掠三角翼强迫俯仰、自由滚转双自由度运动特性。内容包括:对比双自由度俯仰/滚转运动和单自由度滚转及俯仰运动特性的差异,研究动态俯仰角对三角翼滚转运动振幅和频率的影响以及三角翼双自由度运动条件下的气动力特性。结果表明:在动态俯仰角的影响下,细长三角翼不能形成极限环形式的振荡;俯仰运动的迟滞效应造成滚转振幅的变化落后于俯仰角的变化;俯仰耦合滚转运动将会导致飞行器升力降低,横向稳定性变差。

Numerical investigation of the characteristics of double Degree-Of-Freedom（DOF） motion of an 80° delta wing in force-pitch and free-roll is presented,in which a coupling numerical method is employed for solving Navier-Stokes equations and rigid-body dynamic equations.The investigation includes： compare of the characteristics between double DOF motion and single DOF motion,the amplitude and frequency characteristics of the free-roll motion in dynamic incidence and the characteristics of aerodynamics in coupled double DOF motion.It is shown that no limit-cycle-oscillation can be formed with dynamic incidence,the variation of the amplitude of free-roll lags behind the variation of incidence,noticeable inclination of lift and worse transverse stability are achieved in double DOF motion.