2026-06-03T20:36:36Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/280232026-02-03T11:28:09Zcom_10630_2254col_10630_37953
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Sánchez-Laulhe Cazorla, Ernesto
author
Fernández-Feria, Ramón
author
Ollero, Anibal
2023-11-14T11:56:06Z
2023-11-14T11:56:06Z
2023-06-26
Unsteady Propulsion of a Two-Dimensional Flapping Thin Airfoil in a Pulsating Stream Ernesto Sanchez-Laulhe, Ramon Fernandez-Feria, and Anibal Ollero AIAA Journal 2023 61:10, 4391-4400 https://doi.org/10.2514/1.J062925
https://hdl.handle.net/10630/28023
10.2514/1.J062925
The cruising velocity of animals, or robotic vehicles, that use flapping wings or fins to propel themselves is not
constant but oscillates around a mean value with an amplitude usually much smaller than the mean, and a frequency
that typically doubles the flapping frequency. Quantifying the effect that these velocity fluctuations may have on
the propulsion of a flapping and oscillating airfoil is of great relevance to properly modeling the self-propelled
performance of these animals or robotic vehicles. This is the objective of the present work, where the force and
moment that an oscillating stream exerts on a two-dimensional pitching and heaving airfoil are obtained analytically
using the vortical impulse theory in the linear potential flow limit. The thrust force of the flapping airfoil in a pulsating
stream in this limit is obtained here for the first time. The lift force and moment derived here contain new terms in
relation to the pioneering work by Greenberg (1947), which are shown quantitatively unimportant. The theoretical
results obtained here are compared with existing computational data for flapping foils immersed in a stream with
velocity oscillating sinusoidally about a mean value.
eng
Aerodinámica
Vuelo
Unsteady Propulsion of a Two-Dimensional Flapping Thin Airfoil in a Pulsating Stream.
journal article
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