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利用有限体积法离散求解雷诺平均Navier-Stokes方程以及气动和结构耦合计算了带2种不同类型翼梢小翼(融合式和鲨鳍式小翼)的翼身组合体构型.重点研究了小翼不同高度对飞机升阻比、机翼压力中心移动量、重量以及颤振特性的影响规律.研究结果表明,因小翼高度增加而带来的结构重量远远低于其有效载重的增量;因小翼高度增加而带来的颤振临界速度的降低在安全余量的范围内是可以调整的.因此,在设计小翼时与结构、重量和颤振的权衡中,建议高度的选择尽量优先满足纵向的升阻特性,以发挥其减阻潜力.
The finite element method is used to calculate the Reynolds-averaged Navier-Stokes equations discretely and the aerodynamic and structural coupling is used to calculate the configuration of the wing body with two different types of winglet (fusion and shark fin) .Focusing on the small The influence of different heights of wings on the lift-drag ratio, the movement of the pressure center of the wing, the weight and the flutter characteristics were studied.The results show that the structural weight due to the increased winglet height is much lower than the increase of its payload ; The reduction in the critical speed of flutter due to the increased winglet height is adjustable within the margin of safety. Therefore, in designing the winglets with trade-offs between structure, weight and flutter, it is recommended that a high degree of selection As far as possible to give priority to meet the vertical resistance properties, in order to play its drag reduction potential.