Influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet

The “Flutter-mill” is a power generation device that can be parallelized and downsized more easily than conventional wind-power generators with the added advantage of lower manufacturing costs. Flutter-mills comprise a flexible sheet with an electric power generator at its leading edge. Flutter-mill...

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Autores principales:	Akio YAMANO, Hiroshi IJIMA, Atsuhiko SHINTANI, Chihiro NAKAGAWA, Tomohiro ITO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	vortex lattice method large deformation flutter-mill finite element method computational fluid dynamics(cfd) analysis Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/53c6b6d2e0ac4cc484416547c4b35ef6
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spelling	oai:doaj.org-article:53c6b6d2e0ac4cc484416547c4b35ef62021-11-29T06:04:29ZInfluence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet2187-974510.1299/mej.20-00459https://doaj.org/article/53c6b6d2e0ac4cc484416547c4b35ef62021-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/1/8_20-00459/_pdf/-char/enhttps://doaj.org/toc/2187-9745The “Flutter-mill” is a power generation device that can be parallelized and downsized more easily than conventional wind-power generators with the added advantage of lower manufacturing costs. Flutter-mills comprise a flexible sheet with an electric power generator at its leading edge. Flutter-mills exhibit complex power generation performance characteristics that are highly dependent on the specifications of the flexible sheet and the inlet flow velocity. In particular, the span width of the sheet affects the stability and flapping behavior significantly. Using the numerical analysis model, these complex flutter-mill characteristics can be estimated without experiments, and thereby numerical model inform the choice of the sheet dimensions, which are critical for designing an effective flutter-mill. Here, we present a numerical model that can provide a preliminary survey of the power generation performance and attempt to clarify the relationship between the aspect ratio of the sheet and the harvested power. The equation of motion for a flexible sheet includes rotational damping at the leading edge of the sheet to emulate the coupling effect between the sheet and the energy harvesting circuit. We verified the validity of our numerical model by evaluating its performance against previously published experimental results, and thus established the relationship between the aspect ratio of the sheet and the harvested power. We found that the local minimum value of the harvested power of the flutter-mill may be caused by the vibration amplitude at the leading edge of the sheet decreasing in the transition domain of the flapping vibration mode if the aspect ratio is large.Akio YAMANOHiroshi IJIMAAtsuhiko SHINTANIChihiro NAKAGAWATomohiro ITOThe Japan Society of Mechanical Engineersarticlevortex lattice methodlarge deformationflutter-millfinite element methodcomputational fluid dynamics(cfd) analysisMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 1, Pp 20-00459-20-00459 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	vortex lattice method large deformation flutter-mill finite element method computational fluid dynamics(cfd) analysis Mechanical engineering and machinery TJ1-1570
spellingShingle	vortex lattice method large deformation flutter-mill finite element method computational fluid dynamics(cfd) analysis Mechanical engineering and machinery TJ1-1570 Akio YAMANO Hiroshi IJIMA Atsuhiko SHINTANI Chihiro NAKAGAWA Tomohiro ITO Influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet
description	The “Flutter-mill” is a power generation device that can be parallelized and downsized more easily than conventional wind-power generators with the added advantage of lower manufacturing costs. Flutter-mills comprise a flexible sheet with an electric power generator at its leading edge. Flutter-mills exhibit complex power generation performance characteristics that are highly dependent on the specifications of the flexible sheet and the inlet flow velocity. In particular, the span width of the sheet affects the stability and flapping behavior significantly. Using the numerical analysis model, these complex flutter-mill characteristics can be estimated without experiments, and thereby numerical model inform the choice of the sheet dimensions, which are critical for designing an effective flutter-mill. Here, we present a numerical model that can provide a preliminary survey of the power generation performance and attempt to clarify the relationship between the aspect ratio of the sheet and the harvested power. The equation of motion for a flexible sheet includes rotational damping at the leading edge of the sheet to emulate the coupling effect between the sheet and the energy harvesting circuit. We verified the validity of our numerical model by evaluating its performance against previously published experimental results, and thus established the relationship between the aspect ratio of the sheet and the harvested power. We found that the local minimum value of the harvested power of the flutter-mill may be caused by the vibration amplitude at the leading edge of the sheet decreasing in the transition domain of the flapping vibration mode if the aspect ratio is large.
format	article
author	Akio YAMANO Hiroshi IJIMA Atsuhiko SHINTANI Chihiro NAKAGAWA Tomohiro ITO
author_facet	Akio YAMANO Hiroshi IJIMA Atsuhiko SHINTANI Chihiro NAKAGAWA Tomohiro ITO
author_sort	Akio YAMANO
title	Influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet
title_short	Influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet
title_full	Influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet
title_fullStr	Influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet
title_full_unstemmed	Influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet
title_sort	influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/53c6b6d2e0ac4cc484416547c4b35ef6
work_keys_str_mv	AT akioyamano influenceoftheaspectratioofthesheetforanelectricgeneratorutilizingtherotationofaflappingsheet AT hiroshiijima influenceoftheaspectratioofthesheetforanelectricgeneratorutilizingtherotationofaflappingsheet AT atsuhikoshintani influenceoftheaspectratioofthesheetforanelectricgeneratorutilizingtherotationofaflappingsheet AT chihironakagawa influenceoftheaspectratioofthesheetforanelectricgeneratorutilizingtherotationofaflappingsheet AT tomohiroito influenceoftheaspectratioofthesheetforanelectricgeneratorutilizingtherotationofaflappingsheet
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Influence of the aspect ratio of the sheet for an electric generator utilizing the rotation of a flapping sheet

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