论文标题
展览猎鹰的潜水:在拉动操纵和通过机翼旋转的飞行控制
The Peregrine Falcon's Dive: On the Pull-Out Maneuver and Flight Control Through Wing-Morphing
论文作者
论文摘要
在拉出操作期间,观察到展览猎鹰采用特定的飞行配置,这些飞行构型被认为具有与空中猎物相比的空气动力学优势。对受控环境中猎鹰的飞行轨迹的分析表明,它经历了最高3的负载因子,进一步的预测表明,在高速拉出过程中,这可能会增加到几乎10克。这可以归因于通过在机翼上产生涡流结构来提倡的高机动性。在真人大小的模型上进行了风能隧道实验,以及理想化模型上的高保真模拟,这些模型基于不同配置中的动物标本式猎鹰,表明将手翼部署在拉出中会产生额外的涡流升级,类似于带有Delta机翼的战斗机。从模型周围的流量大型涡流模拟计算出空气动力和空气动力中心的位置。这可以分析纵向静态稳定性,以确认猎鹰在投球时刻的斜坡上不稳定地飞行,并且在大约5 $^\ circ $中的攻击角度可能会最大程度地提高响应能力。人们认为,手翼/初选有助于增强的稳定性,就像尾式混合翼飞机上一样。
During the pull-out maneuver, Peregrine falcons were observed to adopt specific flight configurations which are thought to offer an aerodynamic advantage over aerial prey. Analysis of the flight trajectory of a falcon in a controlled environment shows it experiencing load factors up to 3 and further predictions suggest this could be increased up to almost 10g during high-speed pull-out. This can be attributed to the high maneuverability promoted by lift-generating vortical structures over the wing. Wind-tunnel experiments on life-sized models together with high fidelity simulations on idealized models, which are based on taxidermy falcons in different configurations, show that deploying the hand-wing in a pull-out creates extra vortex-lift, similar to that of combat aircraft with delta wings. The aerodynamic forces and the position of aerodynamic center were calculated from Large Eddy Simulations of the flow around the model. This allowed for an analysis of the longitudinal static stability in a pull-out, confirming that the falcon is flying unstably in pitch with a positive slope in the pitching moment and a trim angle of attack of about 5$^\circ$, possibly to maximize responsiveness. The hand-wings/primaries were seen to contribute to the augmented stability acting as `elevons' would on a tailless blended-wing-body aircraft.