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Open AccessArticle
Analysis of Surface Drag Reduction Characteristics of Non-Smooth Jet Coupled Structures
by
Jinming Kou
Jinming Kou 1,2,
Qiannan Lou
Qiannan Lou 1,
Yunqing Gu
Yunqing Gu 1,*,
Junjun Zhang
Junjun Zhang 1,
Chengqi Mou
Chengqi Mou 3,
Jiayun Yu
Jiayun Yu 1,
Youting Ding
Youting Ding 1 and
Chengbo Xu
Chengbo Xu 1
1
College of Metrology Measurement and Instrument, China Jiliang University, Hangzhou 310018, China
2
College of Energy Environment and Safety Engineering, China Jiliang University, Hangzhou 310018, China
3
College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
*
Author to whom correspondence should be addressed.
Lubricants 2024, 12(10), 334; https://doi.org/10.3390/lubricants12100334 (registering DOI)
Submission received: 29 August 2024
/
Revised: 22 September 2024
/
Accepted: 28 September 2024
/
Published: 29 September 2024
Abstract
To enhance the service life of shipping equipment and minimize surface wear, this study employs biomimetic principles, integrating fitted structures with jet dynamics to model three configurations: non-smooth structures, single jet structures, and non-smooth jet-coupled structures. We utilized the SST k-ω turbulence model for numerical simulations to investigate the drag reduction characteristics of these structural models. By varying the jet angle and speed, we analyzed the changes in viscous resistance, pressure differential resistance, and drag reduction rates at the wall surface. Furthermore, the mechanisms of compressive stress, velocity fields, vortex structures, and shear stress on drag-reducing surfaces were elucidated, revealing how these factors contribute to drag reduction in non-smooth jet-coupled structures. The results indicate that the non-smooth jet-coupled structure exhibits superior drag reduction performance at a main flow field velocity of 20 m/s. As the jet velocity increases, the viscous drag on the surface of the non-smooth jet-coupled structure decreases, while the pressure differential drag increases. Conversely, variations in the jet angle have a minimal effect on viscous drag but lead to a reduction in pressure differential drag. Specifically, when the jet velocity is set at 1 m/s, and the jet angle is 60°, the drag reduction achieved by the non-smooth jet-coupled structure peaks at 7.48%. Additionally, the non-smooth jet-coupled structure features a larger area characterized by low shear stress, along with an increased boundary layer thickness at the bottom; this configuration effectively reduces surface velocity and consequent viscous drag.
Share and Cite
MDPI and ACS Style
Kou, J.; Lou, Q.; Gu, Y.; Zhang, J.; Mou, C.; Yu, J.; Ding, Y.; Xu, C.
Analysis of Surface Drag Reduction Characteristics of Non-Smooth Jet Coupled Structures. Lubricants 2024, 12, 334.
https://doi.org/10.3390/lubricants12100334
AMA Style
Kou J, Lou Q, Gu Y, Zhang J, Mou C, Yu J, Ding Y, Xu C.
Analysis of Surface Drag Reduction Characteristics of Non-Smooth Jet Coupled Structures. Lubricants. 2024; 12(10):334.
https://doi.org/10.3390/lubricants12100334
Chicago/Turabian Style
Kou, Jinming, Qiannan Lou, Yunqing Gu, Junjun Zhang, Chengqi Mou, Jiayun Yu, Youting Ding, and Chengbo Xu.
2024. "Analysis of Surface Drag Reduction Characteristics of Non-Smooth Jet Coupled Structures" Lubricants 12, no. 10: 334.
https://doi.org/10.3390/lubricants12100334
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