Understanding the effect of fluctuating wind on the aerodynamic performance of the wing is important for designing practical using flapping-wing micro air vehicles (FMAV). This paper aims at providing a systematic synthesis on the fluctuating wind influence on the performance of the three dimensional lumped flexibility wing based on the numerical analysis approach. The fluctuating wind is simplified as a sine type function, and the flexibility of the wing is modeled as the passive pitching motion by connecting a rigid wing to a torsional spring at the root of the wing. The interaction between the fluctuating wind and the lumped flexibility wing is performed on a high-resolution computational grid. The evaluation is based on validation with published experiment data. The results indicate that the fluctuating wind cannot enhance the flexible wings’ propulsive and lifting performance simultaneously, however, it influences the aerodynamic characteristics of the wing greatly. Comparing to the rigid wing, the suppress leading edge vortex and trailing edge vortex are observed of the flexible wing under appropriate fluctuating wind, which leads the flexible wing to not only have better propulsive and lifting performance, but also flight stability performance.

了解风的波动对机翼空气动力学性能的影响，对于使用襟翼微飞行器（FMAV）设计实用的飞机非常重要。本文旨在基于数值分析方法，对脉动风对三维集总挠性机翼性能的影响进行系统的综合分析。起伏的风简化为正弦函数，机翼的柔韧性通过将刚性机翼连接到机翼根部的扭转弹簧而建模为被动俯仰运动。起伏的风和集总的柔性机翼之间的相互作用是在高分辨率计算网格上执行的。评估基于对已发布实验数据的验证。结果表明，起伏的风不能同时增强柔性机翼的推进和升力性能，但会极大地影响机翼的空气动力特性。与刚性机翼相比，在适当的脉动风作用下，柔性机翼的前缘涡流和后缘涡流均得到抑制，这使得柔性机翼不仅具有更好的推进和提升性能，而且还具有飞行稳定性能。