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| Content Provider | IET Digital Library |
|---|---|
| Author | Zhu, Bing Zhang, Wei Huang, Yun |
| Abstract | Flapping wing devices have attracted considerable attention as a new means of power extraction. The present study applies transient numerical calculations based on the dynamic mesh technique to investigate the influences of leading edge, trailing edge, or overall circular arc airfoil deformations on the power extraction efficiencies of a flapping wing device under the condition of maintaining a constant arc length along the mean camber line of the foil. The results indicate that airfoil deformations can improve the power extraction efficiency of the flapping wing device. The primary reason is that the active synchronised deformation of the foil increases the effective curvature and the velocity circulation around the foil. In addition, the performance curve of the flapping wing device exhibits two frequency ranges with relative high efficiency. In the low frequency region, if the leading edge vortex (LEV) detaches from the trailing edge just as the foil reverses its heaving direction, the foil will gain much more energy due to the positive power extraction of the pitching moment. In the high frequency region, a small steady body-attached vortex (BAV) maintains a high lift, and, thus, the device extracts more power due to the enhanced heaving force. |
| Starting Page | 1823 |
| Ending Page | 1832 |
| Page Count | 10 |
| ISSN | 17521416 |
| Volume Number | 13 |
| e-ISSN | 17521424 |
| Issue Number | Issue 11, Aug (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-rpg/13/11 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2018.6193 |
| Journal | IET Renewable Power Generation |
| Publisher Date | 2019-04-26 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Active Deformation Active Synchronised Deformation Aerodynamics Aerospace Component Aerospace Industry Applied Fluid Mechanics Buoyancy And Other Flows Involving Body Forces Circular Arc Deformation Considerable Attention Deformable Airfoil Deformation Design Engineering Dynamic Mesh Technique Energy Extraction Property Environmental Adaptability Environmental FriendLine Flapping Wing Fluid Mechanics Frequency Range High-frequency Region Leading Edge Deformation Leading Edge Vortex Detaches Low-frequency Region Mechanical Component Mechanical Engineering Nondeformable Flapping Foil Design Numerical Approximation And Analysis Positive Power Extraction Power Extraction Efficiency Power Extraction Performance Relative High Efficiency Relatively Easy Fabrication Rotational Flow Trailing Edge Transient Numerical Calculations Vortices Wing Device |
| Content Type | Text |
| Resource Type | Article |
| Subject | Renewable Energy, Sustainability and the Environment |
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