Passive hovering of a flexible Lambda-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 Publication | Journal of Fluid Mechanics |
2019-11-10 | |
Volume | 878Pages:113-146 |
ISSN | 0022-1120 |
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. |
Keyword | Flow–structure Interactions Swimming/flying Vortex Shedding |
Subject Area | 流体力学 |
DOI | 10.1017/jfm.2019.633 |
URL | 查看原文 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000484506400001 |
Department | LNM湍流 |
Classification | 一类/力学重要期刊 |
Ranking | 1 |
Contributor | Zhang, Xing |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/79256 |
Collection | 非线性力学国家重点实验室 |
Affiliation | 1.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 Lambda-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 Lambda-flyer in a vertically oscillating airflow.Journal of Fluid Mechanics,878,113-146. |
MLA | Zhang X,et al."Passive hovering of a flexible Lambda-flyer in a vertically oscillating airflow".Journal of Fluid Mechanics 878(2019):113-146. |
Files in This Item: | Download All | |||||
File Name/Size | DocType | Version | Access | License | ||
Jp2019352.pdf(1273KB) | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment