TY - JOUR
T1 - Flow-energy harvesting using a fully passive flapping foil: A guideline on design and operation
AU - Zhao, Fuwang
AU - Mumtaz Qadri, M. N.
AU - Wang, Zhaokun
AU - Tang, Hui
N1 - Funding Information:
FZ and HT would like to acknowledge the financial support by National Natural Science Foundation of China under Training Program of Major Research Plan (Project No. 91952107 ).
Publisher Copyright:
© 2021 Elsevier Ltd
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - Following our previous work [Int. J. Mech. Sci. (2020), vol. 177, 105587], we searched the best power extraction performance of a novel flow-energy harvester, which utilizes a fully passive flapping foil to extract energy from air/water flows. A series of water-tunnel experiments were conducted on the same test model at the Reynolds number around 105. Through investigating the effects of two unexplored key parameters, a higher overall maximum power conversion efficiency of 42.7% was obtained at water speed 0.71 m/s and foil pitching amplitude 60∘, corresponding to a larger mean power output of about 1.51 W. A quasi-steady theoretical model was also developed to fast predict the system performance in a larger parameter space. It was found that, in addition to typical dynamics, i.e., a flapping cycle includes two pure-heaving phases and two stroke-reversal phases, the foil system can also continuously operate in a “no-pure-heaving” zone where a flapping cycle only includes two successive stroke-reversal phases. Through these experimental and theoretical studies, a useful guideline was proposed on the design and operation of the foil system.
AB - Following our previous work [Int. J. Mech. Sci. (2020), vol. 177, 105587], we searched the best power extraction performance of a novel flow-energy harvester, which utilizes a fully passive flapping foil to extract energy from air/water flows. A series of water-tunnel experiments were conducted on the same test model at the Reynolds number around 105. Through investigating the effects of two unexplored key parameters, a higher overall maximum power conversion efficiency of 42.7% was obtained at water speed 0.71 m/s and foil pitching amplitude 60∘, corresponding to a larger mean power output of about 1.51 W. A quasi-steady theoretical model was also developed to fast predict the system performance in a larger parameter space. It was found that, in addition to typical dynamics, i.e., a flapping cycle includes two pure-heaving phases and two stroke-reversal phases, the foil system can also continuously operate in a “no-pure-heaving” zone where a flapping cycle only includes two successive stroke-reversal phases. Through these experimental and theoretical studies, a useful guideline was proposed on the design and operation of the foil system.
KW - Flow-energy harvesting
KW - Fluid-structure interaction
KW - Fully passive flapping foil
UR - http://www.scopus.com/inward/record.url?scp=85100610492&partnerID=8YFLogxK
U2 - 10.1016/j.ijmecsci.2021.106323
DO - 10.1016/j.ijmecsci.2021.106323
M3 - Journal article
AN - SCOPUS:85100610492
SN - 0020-7403
VL - 197
JO - International Journal of Mechanical Sciences
JF - International Journal of Mechanical Sciences
M1 - 106323
ER -