Bionic investigation of a dolphin head-based hydrofoil with emphasis on energy performance and flow characteristics

Zhang, J; Zhang, Runqiang; Huang, Zhenwei

doi:10.1016/j.oceaneng.2023.113692

Cited by 17 publications

(2 citation statements)

References 64 publications

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“…This is because the impellers are performing work on the fluid and gradually increasing in strength, and the phenomenon of dynamic-static interference between the impeller and the guide vane intensifies. Vortices are continuously generated inside the flow passage, enhancing the vorticity, and the flow separation on the blade surface is also one of the causes of this phenomenon (Fang et al, 2022b;Fang et al, 2023;Zhang et al, 2023b). Between 0.5 and 0.7s after start-up, the speed reaches a steady state, and the flow state at the impeller outlet also becomes stable, with the quadrupole noise exhibiting periodic variations.…”

Section: Distribution Of Dipole Noise and Quadrupole Noisementioning

confidence: 99%

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

Zhang,

Wang,

Yang

et al. 2024

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PurposeThis study aims to investigate the noise-inducing characteristics during the start-up process of a mixed-flow pump and the impact of different start-up schemes on pump noise.Design/methodology/approachThis study conducted numerical simulations on the mixed-flow pump under different start-up schemes and investigated the flow characteristics and noise distribution under these schemes.FindingsThe results reveal that the dipole noise is mainly caused by pressure fluctuations, while the quadrupole noise is mainly generated by the generation, development and breakdown of vortices. Additionally, the noise evolution characteristics during the start-up process of the mixed-flow pump can be divided into the initial stage, stable growth stage, impulse stage and stable operation stage.Originality/valueThe findings of this study can provide a theoretical basis for the selection of start-up schemes for mixed-flow pumps, reducing flow noise and improving the operational stability of mixed-flow pumps.

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Section: Distribution Of Dipole Noise and Quadrupole Noisementioning

confidence: 99%

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

Zhang,

Wang,

Yang

et al. 2024

Self Cite

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“…They are functional strategies formed in the long-term evolution of high-speed swimming organisms, such as fish. Many fish and sea animals exhibit excellent drag reduction capacity [1][2][3][4]. The scale of the fish Ctenopharyngodon idellus has many micro crescent units distributed on its surface, which can generate a "water-trapping" effect and form fluid lubrication to abate skin friction [5].…”

Section: Introductionmentioning

confidence: 99%

Drag reduction capacity of multi‐scale and multi‐level riblet in turbulent flow

Chen,

Li,

Zhao

et al. 2024

Biosurface and Biotribology

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For high‐speed moving objects, drag reduction has been a prolonged major challenge. To address this problem, passive and negative strategies have been proposed in the preceding decades. The integration of creatures and nature has been continuously perfected during biological evolution. Unique structure characteristics, material properties, and special functions of marine organisms can provide inexhaustible inspirations to solve this intractable problem of drag reduction. Therefore, a simple and low‐cost laser ablation method was proposed. A multi‐scale and multi‐level riblet (MSLR) surface inspired by the denticles of the sharkskin was fabricated by controlling the density of the laser path and ablation times. The morphology and topographic features were characterised using an electron microscope and a scanning white‐light interfering profilometer. Then, the drag reduction capacity of the bionic riblet surface was measured in a circulating water tunnel. Finally, the mechanism of drag reduction was analysed by the computational fluid dynamics (CFD) method. The results show that the MSLR surface has a stable drag reduction capacity with an increase in Reynold (Re) number which was contributed by high‐low velocity stripes formed on the MSLR surface. This study can provide a reference for fabricating spatial riblets with efficient drag reduction at different values of Re and improving marine antifouling.

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Orca hydrofoil shape optimization using Bezier curve and artificial neural network – Multiple objective genetic algorithm for low flow velocity

Masykur,

Harinaldi

2024

Journal of King Saud University - Engineering Sciences

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Bionic investigation of a dolphin head-based hydrofoil with emphasis on energy performance and flow characteristics

Cited by 17 publications

References 64 publications

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

Drag reduction capacity of multi‐scale and multi‐level riblet in turbulent flow

Orca hydrofoil shape optimization using Bezier curve and artificial neural network – Multiple objective genetic algorithm for low flow velocity

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