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6 - Biological Techniques

Published online by Cambridge University Press:  14 December 2018

Jinjun Wang  and
Lihao Feng
Jinjun Wang
Affiliation:
Beijing University of Aeronautics and Astronautics
Lihao Feng
Affiliation:
Beijing University of Aeronautics and Astronautics
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Summary

Biological flow control techniques are derived from nature. It is expected that we can learn from animals and plants to copy or mimic these features to improve the performance of man-made systems. The techniques that are specifically introduced here include hairy coating, leading-edge tubercles, riblet, and cactus-shape modification. Hairy coating can adapt to flow, and thus reduce the drag coefficient of bluff bodies while increasing the lift coefficient of airfoils. Leading-edge tubercles can induce a streamwise vortex from each protuberance to enhance momentum mixing for the separated flow. Surface riblets can reduce the momentum exchange properties of the streamwise vortices, leading to a friction drag reduction of up to 10%. The cactus-shape modification may decrease the size of the wake vortices and the strength of their interaction, thus reducing the lift fluctuation and vortex-induced vibration. It is indicated that biomimetic techniques are easy to mplement with high control effectiveness, and thus show great potential in engineering applications.
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Flow Control Techniques and Applications , pp. 108 - 140
Publisher: Cambridge University Press
Print publication year: 2018

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