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Applied Bionics and Biomechanics
Volume 2017, Article ID 6858720, 8 pages
https://doi.org/10.1155/2017/6858720
Review Article

Analysis of Drag Reduction Methods and Mechanisms of Turbulent

1College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
2School of Energy and Power Engineering, Jiangsu University, Jiangsu, Zhenjiang 212013, China

Correspondence should be addressed to Gu Yunqing; nc.ude.tujz@gniqnuyug

Received 30 April 2017; Accepted 20 August 2017; Published 18 September 2017

Academic Editor: Saurabh Das

Copyright © 2017 Gu Yunqing et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Turbulent flow is a difficult issue in fluid dynamics, the rules of which have not been totally revealed up to now. Fluid in turbulent state will result in a greater frictional force, which must consume great energy. Therefore, it is not only an important influence in saving energy and improving energy utilization rate but also an extensive application prospect in many fields, such as ship domain and aerospace. Firstly, bionic drag reduction technology is reviewed and is a hot research issue now, the drag reduction mechanism of body surface structure is analyzed, such as sharks, earthworms, and dolphins. Besides, we make a thorough study of drag reduction characteristics and mechanisms of microgrooved surface and compliant wall. Then, the relevant drag reduction technologies and mechanisms are discussed, focusing on the microbubbles, the vibrant flexible wall, the coating, the polymer drag reduction additives, superhydrophobic surface, jet surface, traveling wave surface drag reduction, and the composite drag reduction methods. Finally, applications and advancements of the drag reduction technology in turbulence are prospected.