Effects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body

Wind-tunnel experiments are performed to investigate the effects of trailing-edge reattachment on the flutter behaviors of spring-suspended trailing-edge-changeable section models. Different Trailing edges (TE) were fixed at the back of a body to adjust reattachment of the vortex. A laser-displaceme...

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Autores principales:	Jie Feng, Buchen Wu, Shujin Laima
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	trailing-edge reattachment trailing edge trailing-edge-changeable streamlined section mode limit cycle flutter hard flutter flutter stability Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/5aea1a166fd846ac9e00f142809d2f89
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id	oai:doaj.org-article:5aea1a166fd846ac9e00f142809d2f89
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spelling	oai:doaj.org-article:5aea1a166fd846ac9e00f142809d2f892021-11-25T16:38:39ZEffects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body10.3390/app1122108182076-3417https://doaj.org/article/5aea1a166fd846ac9e00f142809d2f892021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10818https://doaj.org/toc/2076-3417Wind-tunnel experiments are performed to investigate the effects of trailing-edge reattachment on the flutter behaviors of spring-suspended trailing-edge-changeable section models. Different Trailing edges (TE) were fixed at the back of a body to adjust reattachment of the vortex. A laser-displacement system was used to acquire the vibration signals. The relationship between flutter characteristics and TEs that affects the wake mode was analyzed. The results show that the motion of the wake vortex has a certain correlation with the flutter stability of the bridge deck. Limit cycle flutter (LCF) occurs to a section model with a 30° TE, whose amplitude gradually increases as the wind speed increases, and the vibration develops into a hard flutter when the wind speed is 12.43 m/s. A section model with 180 TE reaches a hard flutter when the wind speed is 15.31 m/s, without the stage of LCF. As the TE becomes more and more blunt, the critical wind speed, U<sub>s</sub>, gradually increases, meaning the flutter stability gradually increases. The results reveal that LCF may still occur to the bridge section with a streamlined front edge, and, in some cases, it also may have a range of wind speeds in which LCF occurs.Jie FengBuchen WuShujin LaimaMDPI AGarticletrailing-edge reattachmenttrailing edgetrailing-edge-changeable streamlined section modelimit cycle flutterhard flutterflutter stabilityTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10818, p 10818 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	trailing-edge reattachment trailing edge trailing-edge-changeable streamlined section mode limit cycle flutter hard flutter flutter stability Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	trailing-edge reattachment trailing edge trailing-edge-changeable streamlined section mode limit cycle flutter hard flutter flutter stability Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Jie Feng Buchen Wu Shujin Laima Effects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body
description	Wind-tunnel experiments are performed to investigate the effects of trailing-edge reattachment on the flutter behaviors of spring-suspended trailing-edge-changeable section models. Different Trailing edges (TE) were fixed at the back of a body to adjust reattachment of the vortex. A laser-displacement system was used to acquire the vibration signals. The relationship between flutter characteristics and TEs that affects the wake mode was analyzed. The results show that the motion of the wake vortex has a certain correlation with the flutter stability of the bridge deck. Limit cycle flutter (LCF) occurs to a section model with a 30° TE, whose amplitude gradually increases as the wind speed increases, and the vibration develops into a hard flutter when the wind speed is 12.43 m/s. A section model with 180 TE reaches a hard flutter when the wind speed is 15.31 m/s, without the stage of LCF. As the TE becomes more and more blunt, the critical wind speed, U<sub>s</sub>, gradually increases, meaning the flutter stability gradually increases. The results reveal that LCF may still occur to the bridge section with a streamlined front edge, and, in some cases, it also may have a range of wind speeds in which LCF occurs.
format	article
author	Jie Feng Buchen Wu Shujin Laima
author_facet	Jie Feng Buchen Wu Shujin Laima
author_sort	Jie Feng
title	Effects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body
title_short	Effects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body
title_full	Effects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body
title_fullStr	Effects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body
title_full_unstemmed	Effects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body
title_sort	effects of the configuration of trailing edge on the flutter of an elongated bluff body
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5aea1a166fd846ac9e00f142809d2f89
work_keys_str_mv	AT jiefeng effectsoftheconfigurationoftrailingedgeontheflutterofanelongatedbluffbody AT buchenwu effectsoftheconfigurationoftrailingedgeontheflutterofanelongatedbluffbody AT shujinlaima effectsoftheconfigurationoftrailingedgeontheflutterofanelongatedbluffbody
_version_	1718413077203910656

Effects of the Configuration of Trailing Edge on the Flutter of an Elongated Bluff Body

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