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Passive hovering of a flexible Lamda-flyer in a vertically oscillating airflow
Zhang X(张翔)1,2; He GW(何国威)1,2; Wang SZ(王士召)1,2; Zhang X(张星)1,2
Source PublicationJournal of Fluid Mechanics
2019-09-10
Volume878Pages:113-146
Abstract

We numerically investigate the passive flight of a flexible Lamda-flyer in a vertically oscillating airflow with zero mean stream. The flexibility of the  flyer is introduced by a torsion spring installed at the hinged joint. We study the effects of spring stiffness, density, resting angle and actuation efforts on the hovering performance. The results suggest that the occurrence of resonance in flexible flyers can result in significantly different performances in flexible and rigid flyers. It is found that flexibility can have two opposing effects, reducing or increasing the actuation efforts for hovering, depending on the range of driving frequency. This result is explained by the modulation of relative motion between the flyer and the imposed background flow due to the involvement of passive angular oscillation. The angular oscillation patterns, the wake symmetry properties and the postural stability behaviours under different driving conditions are also explored. Based on the findings of the present study, the ideal parameter values for stable hovering are suggested. The results of this study offer novel insight into the mechanism by which the flexibility of the flyer affects the passive hovering performance. 

KeywordFlow–structure Interactions Swimming/flying Vortex Shedding
Subject Area流体力学
DOI10.1017/jfm.2019.633
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Indexed BySCI
Language英语
DepartmentLNM湍流
Classification一类/力学重要期刊
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/79256
Collection非线性力学国家重点实验室
Corresponding AuthorZhang X(张星)
Affiliation1.中国科学院力学研究所非线性力学国家重点实验室
2.中国科学院大学工程科学学院
Recommended Citation
GB/T 7714
Zhang X,He GW,Wang SZ,et al. Passive hovering of a flexible Lamda-flyer in a vertically oscillating airflow[J]. Journal of Fluid Mechanics,2019,878:113-146.
APA Zhang X,He GW,Wang SZ,&Zhang X.(2019).Passive hovering of a flexible Lamda-flyer in a vertically oscillating airflow.Journal of Fluid Mechanics,878,113-146.
MLA Zhang X,et al."Passive hovering of a flexible Lamda-flyer in a vertically oscillating airflow".Journal of Fluid Mechanics 878(2019):113-146.
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