Energy harnessing of multiple semi-active flapping ellipses in V-shape formation

Two-dimensional numerical simulations based on an immersed boundary method are performed for the two-foil system with varying spacings, and a staggered arrangement with a spacing normalized by chord length (X d / D, Y d / D) = (2.0, 2.5) is found to be the most favorable for energy harnessing with t...

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Main Authors: Gong, Lingyun, Zhu, Hongbo, Huan, Caiyun, Bao, Yan, Zhou, Dai, Han, Zhaolong, Ng, Bing Feng
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/169425
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1694252023-07-22T16:48:11Z Energy harnessing of multiple semi-active flapping ellipses in V-shape formation Gong, Lingyun Zhu, Hongbo Huan, Caiyun Bao, Yan Zhou, Dai Han, Zhaolong Ng, Bing Feng School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Chord Lengths Efficiency Enhancement Two-dimensional numerical simulations based on an immersed boundary method are performed for the two-foil system with varying spacings, and a staggered arrangement with a spacing normalized by chord length (X d / D, Y d / D) = (2.0, 2.5) is found to be the most favorable for energy harnessing with the efficiency enhancement of nearly 40% for the downstream foil. By scrutinizing the mean flow characteristics and the instantaneous wake dynamics, it is revealed that convective flow acceleration and vortex impingement in synchronized timing with foil motion are the two primary mechanisms that contribute to significant efficiency improvement. Based on the staggered arrangement for the two-foil system, a V-shape formation is further proposed for the multiple-foil system and verified with the highest efficiency of energy harnessing up to nearly twice that of a single foil. Published version The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Grant Nos. 42076210, 52122110, 52101322, and 11772193). 2023-07-18T05:23:22Z 2023-07-18T05:23:22Z 2022 Journal Article Gong, L., Zhu, H., Huan, C., Bao, Y., Zhou, D., Han, Z. & Ng, B. F. (2022). Energy harnessing of multiple semi-active flapping ellipses in V-shape formation. Physics of Fluids, 34(12), 123608-. https://dx.doi.org/10.1063/5.0127682 1070-6631 https://hdl.handle.net/10356/169425 10.1063/5.0127682 2-s2.0-85144631537 12 34 123608 en Physics of Fluids © 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Chord Lengths
Efficiency Enhancement
spellingShingle Engineering::Mechanical engineering
Chord Lengths
Efficiency Enhancement
Gong, Lingyun
Zhu, Hongbo
Huan, Caiyun
Bao, Yan
Zhou, Dai
Han, Zhaolong
Ng, Bing Feng
Energy harnessing of multiple semi-active flapping ellipses in V-shape formation
description Two-dimensional numerical simulations based on an immersed boundary method are performed for the two-foil system with varying spacings, and a staggered arrangement with a spacing normalized by chord length (X d / D, Y d / D) = (2.0, 2.5) is found to be the most favorable for energy harnessing with the efficiency enhancement of nearly 40% for the downstream foil. By scrutinizing the mean flow characteristics and the instantaneous wake dynamics, it is revealed that convective flow acceleration and vortex impingement in synchronized timing with foil motion are the two primary mechanisms that contribute to significant efficiency improvement. Based on the staggered arrangement for the two-foil system, a V-shape formation is further proposed for the multiple-foil system and verified with the highest efficiency of energy harnessing up to nearly twice that of a single foil.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Gong, Lingyun
Zhu, Hongbo
Huan, Caiyun
Bao, Yan
Zhou, Dai
Han, Zhaolong
Ng, Bing Feng
format Article
author Gong, Lingyun
Zhu, Hongbo
Huan, Caiyun
Bao, Yan
Zhou, Dai
Han, Zhaolong
Ng, Bing Feng
author_sort Gong, Lingyun
title Energy harnessing of multiple semi-active flapping ellipses in V-shape formation
title_short Energy harnessing of multiple semi-active flapping ellipses in V-shape formation
title_full Energy harnessing of multiple semi-active flapping ellipses in V-shape formation
title_fullStr Energy harnessing of multiple semi-active flapping ellipses in V-shape formation
title_full_unstemmed Energy harnessing of multiple semi-active flapping ellipses in V-shape formation
title_sort energy harnessing of multiple semi-active flapping ellipses in v-shape formation
publishDate 2023
url https://hdl.handle.net/10356/169425
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