[2018-Vol.15-Issue 4]Morphology Effects of Leading-edge Serrations on Aerodynamic Force Pro-duction: An Integrated Study Using PIV and Force Measurements
Time: 2018-09-03 11:12  Click:341
Journal of Bionic Engineering
Volume 15, Issue 3, May 2018, Pages 661-672.
Teruaki Ikeda1,2, Tetsuya Ueda1, Toshiyuki Nakata1, Ryusuke Noda1, Hiroto Tanaka3, Takeo Fujii2, Hao Liu1,4*
1. Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba-shi, Chiba 263-8522, Japan
2. TERAL Inc., 230 Moriwake, Miyuki-cho, Fukuyama-shi, Hiroshima 720-0003, Japan
3. School of Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 Japan
4. Shanghai Jiao Tong University and Chiba University International Cooperative Research Centre (SJTU-CU ICRC), 
Shanghai 200240, China
Abstract  While the leading-edge serration in owls’ wing is known to be responsible for low noise gliding and flapping flights, the findings on its aero-acoustic role have been diverse or even controversial. Here we present an experimental study of the morphological effects of leading-edge serrations on aerodynamic force production by utilizing owl-inspired, single-feather, clean and serrated wing models with different serration lengths and spacing, and by combining Particle Image Velocimetry (PIV) and force measurements. Force measurements show that an increase in the length and density of the leading-edge serrations leads to a reduction in the lift coefficient and lift-to-drag ratio at Angles of Attack (AoAs) < 15? whereas the clean and serrated wings achieve comparable aerodynamic performance at higher AoAs > 15?, which owl wings often reach in flight. Furthermore PIV visualization of the flow fluctuations demonstrates that the leading-edge serration-based mechanism is consistent in all serrated wing models in terms of passive control of the laminar-turbulent transition while at AoAs > 15? similar suction flow is present at leading edge resulting in a comparable aerodynamic performance to that of the clean wing. Our results indicate the robustness and usefulness of leading-edge serration-inspired devices for aero-acoustic control in biomimetic rotor designs. 
Key words: biomimetic      leading-edge serrations      low-speed wind tunnel      particle image velocimetry     aerodynamic force      lami-nar-turbulent transition

Full text is available at :https://link.springer.com/article/10.1007/s42235-018-0054-4

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