Drag Reduction Effect of Gradually-Varying Riblet Structures on Conical Rotating Disks

WU Sen; ZOU Jiaqi; FAN Yicheng; ZHAO Dan

doi:10.11993/j.issn.2096-3920.2026-0005

Volume 34 Issue 2

Apr 2026

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Article Navigation > Journal of Unmanned Undersea Systems > 2026 > 34(2): 316-325

WU Sen, ZOU Jiaqi, FAN Yicheng, ZHAO Dan. Drag Reduction Effect of Gradually-Varying Riblet Structures on Conical Rotating Disks[J]. Journal of Unmanned Undersea Systems, 2026, 34(2): 316-325. doi: 10.11993/j.issn.2096-3920.2026-0005

Citation:

WU Sen, ZOU Jiaqi, FAN Yicheng, ZHAO Dan. Drag Reduction Effect of Gradually-Varying Riblet Structures on Conical Rotating Disks[J]. Journal of Unmanned Undersea Systems, 2026, 34(2): 316-325. doi: 10.11993/j.issn.2096-3920.2026-0005

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Drag Reduction Effect of Gradually-Varying Riblet Structures on Conical Rotating Disks

doi: 10.11993/j.issn.2096-3920.2026-0005

WU Sen^1
,,
ZOU Jiaqi^1
,,
FAN Yicheng^1
,,
ZHAO Dan^{2
,
,}

1.
Military Representative Office of Naval in Wuxi, Wuxi 214000, China
2.
College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150000, China

Received Date: 2026-01-07
Accepted Date: 2026-03-09
Rev Recd Date: 2026-03-06

Available Online: 2026-03-19

Abstract

Abstract

Based on the enclosed flow field conditions and optimized dynamic-static clearances, a gradually-varying riblet drag reduction structure was proposed by combining the drag reduction principle of uniform-sized riblets to address the problem of increased flow resistance and higher power consumption of the conical front shroud region of the impeller in permanent magnet integrated centrifugal pumps. The drag reduction effect of the gradually-varying riblet structure was investigated and compared with that of a smooth flat disk, a smooth conical disk, and a conical disk with uniform-sized riblets. The results indicate that by adjusting its geometric dimensions along the radial direction, the gradually-varying riblets can more effectively reorganize the near-wall flow structure and alter streamline patterns and velocity distributions, thereby optimizing the wall shear stress field and achieving effective control over flow separation and turbulent dissipation. For the conical rotating disk, arranging gradually-varying riblets on the conical surface can reduce the drag torque below that of both the smooth flat disk and the disk with uniform-sized riblets. Specifically, at the rated rotational speed, the torque coefficient decreases by 9.9% compared to the smooth flat disk and by 2.31% compared to the conical disk with uniform-sized riblets. This study can provide a theoretical reference for the low-resistance design and performance improvement of centrifugal pump impellers.
- permanent magnet integrated centrifugal pumps,
- drag reduction,
- conical rotating disk,
- gradually-varying riblet

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References(21)

References

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