PDF(Pubmed)
Abstract：
The present investigations on tandem wing configurations primarily revolve around the effects of the spacing L and the phase difference φ between the forewing and the hindwing on aerodynamic performance. However, in nature, organisms employing biplane flight, such as dragonflies, demonstrate the ability to achieve superior aerodynamic performance by flexibly adjusting their flapping trajectories. Therefore, this study focuses on the effects of φ, as well as the trajectory of the hindwing, on aerodynamic performance. By summarizing four patterns of wake-wing interaction processes, it is indicated that φ=-90∘ and 0∘ enhances the thrust of the hindwing, while φ=90∘ and 180∘ result in reductions. Furthermore, the wake-wing interactions and shedding modes are summarized corresponding to three kinds of trajectories, including elliptical trajectories, figure-eight trajectories, and double figure-eight trajectories. The results show that the aerodynamic performance of the elliptical trajectory is similar to that of the straight trajectory, while the figure-eight trajectory with positive surging motion significantly enhances the aerodynamic performance of the hindwing. Conversely, the double-figure-eight trajectory degrades the aerodynamic performance of the hindwing.
摘要：
目前对串联机翼配置的研究主要围绕间距L和前翼与后翼之间的相位差φ对空气动力学性能的影响。然而,在自然界中,使用生物双翼飞机飞行，比如蜻蜓，通过灵活调整其拍打轨迹，展示了实现卓越的空气动力学性能的能力。因此,这项研究的重点是φ的影响，以及后翼的轨迹，空气动力学性能。通过总结尾翼相互作用过程的四种模式，表明φ=-90○和0○增强了后翼的推力，而φ=90○和180○导致减少。此外，总结了对应于三种轨迹的尾翼相互作用和脱落模式，包括椭圆轨迹，图8轨迹，和双八字轨迹。结果表明，椭圆轨迹的气动性能与直线轨迹的气动性能相似，而具有正波动运动的8字形轨迹显着增强了后翼的空气动力学性能。相反，双八字轨迹降低了后翼的空气动力学性能。
