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Effect of biomimetic fish scale structure on the drag reduction performance of Clark-Y hydrofoil.

Authors :
Yan, Hao
Xie, Tengzhou
Wang, Fei
Zeng, Yishan
Ai, Jiaqiu
Source :
Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment (Sage Publications, Ltd.); Nov2024, Vol. 238 Issue 4, p763-777, 15p
Publication Year :
2024

Abstract

A hydrofoil is a basic shape of fluid machinery blades, and its drag reduction performance is an important reference index in the field of fluid transportation. When fluid flows around a hydrofoil, it generates friction drag and pressure drag, greatly reducing the hydrofoil's hydraulic performance. This study designs a bionic drag reduction structure by arranging fish scales on a Clark-Y hydrofoil. The overlapping size, thickness, and coverage area of fish scales are taken as design parameters, and the optimal design scheme is attained by using the Taguchi method. Large eddy simulation is used to numerically simulate various schemes. Results show that when the overlapping size O is 2.00 mm, the thickness h is 0.36 mm, the initial position x/C of the fish scale covering is 0 (where C is the chord length of the hydrofoil), and the hydrofoil exhibits excellent drag reduction performance. The total drag reduction rate of the hydrofoil is up to 35.15%, and the drag reduction rate of friction drag and pressure drag is up to 39.56% and 25.64%, respectively. The lift–drag ratio of the hydrofoil increases by 18.04%. The bionic fish scale structure effectively inhibits turbulence, thereby reducing the drag caused by the transformation of laminar flow to turbulence. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14750902
Volume :
238
Issue :
4
Database :
Complementary Index
Journal :
Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment (Sage Publications, Ltd.)
Publication Type :
Academic Journal
Accession number :
180405851
Full Text :
https://doi.org/10.1177/14750902241228153