In this numerical study, we have investigated the transient and time-averaged thrust performance of a two-dimensional elliptic airfoil sinusoidally flapping near a flat ground surface. To characterize the ground effects on the aerodynamic performance of the flapping airfoil, we have varied the mean ground clearances of the airfoil, flapping frequency, and pivot location on the airfoil. However, the Reynolds number of the incoming flow and effective angle of attack of the flapping airfoil is fixed as 5000 and 15 degrees, respectively. It is observed that regardless of the mean ground clearance and pivot location, the time-averaged thrust performance of the flapping airfoil increases monotonically with flapping frequency until it reaches a peak value at some critical flapping frequency; beyond which the thrust performance deteriorates considerably. Additionally, we observed when the mean ground clearance is reduced; the time-averaged thrust of the flapping airfoil is augmented at all pivot locations and flapping frequencies. Furthermore, we found that for the considered parameters, the pivot location near the leading-edge side of the airfoil provides a better time-average thrust performance than any other pivot location when the flapping airfoil experiences ground effects. Besides, we noticed that the transient thrust profile in a flapping cycle gets modified with a change in the flapping frequency, pivot location and mean ground clearances. We have thoroughly identified the specific types of transient thrust profiles associated with the increasing and reducing regions of the time-averaged thrust of the flapping airfoil at different pivot locations and mean ground clearances.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Aerodynamic Performance of a Two-Dimensional Flapping Elliptic Airfoil in Ground Proximity


    Contributors:


    Publication date :

    2021-07-16


    Size :

    9744512 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    Effects of airfoil on aerodynamic performance of flapping wing

    Min Zhao / Yao Zou / Qiang Fu et al. | DOAJ | 2021

    Free access

    Aerodynamics of a Flapping Airfoil in Forward Flight in Proximity of Ground

    Li, Hang / Qu, Qiulin / Agarwal, Ramesh K. | AIAA | 2017


    Aerodynamic Analysis of Flapping Airfoil Propulsion at Low Reynolds Numbers

    Windte, Jan / Radespiel, Rolf / Neef, Matthias | Springer Verlag | 2005


    Aerodynamic Analysis of Flapping Airfoil Propulsion at Low Reynolds Numbers

    Windte, J. / Radespiel, R. / Neef, M. | British Library Conference Proceedings | 2005


    Design of flapping airfoil for optimum aerodynamic performance in Low-Reynolds number flows

    Lee, Jung-Sang / Kim, Chongam / Kim, Kyu Hong | Tema Archive | 2006