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Numerical Simulation of Flapping Airfoil with Alula by Han Bao; Wenqing Yang; Dongfu Ma; Wenping Song; Bifeng Song is a Engineering article available to read on EtoBox.

What is Numerical Simulation of Flapping Airfoil with Alula about?

Bionic micro aerial vehicles have become popular because of their high thrust efficiency and deceptive appearances. Leading edge or trailing edge devices (such as slots or flaps) are often used to improve the flight performance. Birds in nature also have leading-edge devices, known as the alula that can improve their flight performance at large angles of attack. In the present study, the aerodynamic performance of a flapping airfoil with alula is numerically simulated to illustrate the effects of different alula geometric parameters. Different alula relative angles of attack b (the angle between the chord line of the alula and that of the main airfoil) and vertical distances h between the alula and the main airfoil are simulated at pre-stall and post-stall conditions. Results show that at pre-stall condition, the lift increases with the relative angle of attack and the vertical distance, but the aerodynamic performance is degraded in the presence of alula compared with no alula, whereas at post-stall condition, the alula greatly enhances the lift. However, there seems to be an optimal relative angle of attack for the maximum lift enhancement at a fixed vertical distance considering

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Author

Han Bao; Wenqing Yang; Dongfu Ma; Wenping Song; Bifeng Song

Publisher

SAGE Publications

Published

2020

Language

EN

Field

Engineering (Physical Sciences)