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Unsteady aerodynamics of a micro flapping rotary wing in forward flight

机译：向前飞行的微拍旋翼的不稳定空气动力学

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Flapping rotary wing (FRW) is a promising wing layout applicable to micro air vehicles design due to its capability in high lift production. Previous aerodynamic investigations of FRW have mainly focused on hovering flight, while forward flight has been relatively ignored. Therefore, this numerical study aims to address the unsteady aerodynamics of FRW in forward flight based on a FRW configuration with a forward-tilted rotational plane. Results show that compared with hovering flight, forward flying FRW shows a rotational-cycle-averaged thrust and lift reduction and an enhanced rotating moment, all of which can be mainly ascribed to the changes in the aerodynamics on the retreating side. For FRW rotating at a specified rotational speed, the larger advance ratio and severe forward tilt of its rotational plane are both disadvantageous to thrust production and can lead to significant lift reduction. However, they are beneficial for rotational moment enhancement and conducive to FRW rotating at higher speeds, thereby further compensating for the losses in thrust and lift. By further taking a real FRW at near-zero rotating moment into consideration, high thrust and lift can be achieved at the same time in cases of high advance ratio and large rotational plane tilt angle due to fast passive rotating, which differs from flapping wing and rotary wing. These findings can expand our understanding of the unsteady aerodynamics of flapping wing with complex kinematics in forward flight and provide guidance to the design of an FRW micro air vehicle that is capable of forward flight. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：拍打旋转翼（FRW）是一种有前途的翼布置，适用于微型空气车辆设计，由于其高升力生产的能力。之前的FRW的空气动力学调查主要集中在悬停飞行中，而前锋飞行相对忽略。因此，该数值研究旨在基于具有前向倾斜的旋转平面的FRW配置来解决前向飞行中FRW的不稳定空气动力学。结果表明，与悬停飞行相比，向前飞行FRW表示旋转循环平均推力和升降升降机，所有这些都可以主要归因于撤回侧的空气动力学的变化。对于以指定的转速旋转的FRW旋转，其旋转平面的更大的预先比率和严重的前向倾斜既不是推力生产的不利因素，并且可能导致显着的提升降低。然而，它们是有益的旋转力矩增强，并且有利于以更高速度旋转的FRW，从而进一步补偿推力和升力的损失。通过进一步在接近零旋转时刻进行真正的FRW考虑，可以在高预先比率和大型旋转平面倾斜角度的情况下同时实现高推力和升力，这是由于快速被动旋转而导致的，这与拍打翼和旋翼。这些发现可以扩大我们对向前飞行中复杂运动学的扑翼的不稳定空气动力学的理解，并为能够前进飞行的FRW微空气车辆的设计提供指导。 （c）2021 Elsevier Masson SAS。版权所有。

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