A review of underwater bio-mimetic propulsion: cruise and fast-start

Chao, Li-Ming; Cao, Yonghui; Pan, Guang

doi:10.1088/1873-7005/aa6a66

Cited by 18 publications

(5 citation statements)

References 63 publications

(36 reference statements)

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“…With the development of science and technology, researchers have conscientiously considered swimming performance to be scientific, as explained in the light of fluid dynamics (Lighthill 1969; Triantafyllou, Triantafyllou & Yue 2000; Dabiri 2009; Lauder 2009; 2015; Shelley & Zhang 2011; Wu 2011; Chao, Cao & Pan 2017; Smits 2019; Alam & Muhammad 2020). Generally, natural swimmers share two similar propulsive strategies, including body-caudal-fin (BCF) and media-paired-fin propulsion (Breder 1926).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic performance of slender swimmer: effect of travelling wavelength

2022

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The impact of Strouhal number St (= 0.1–1.0), Reynolds number Re (= 50–2000) and dimensionless wavelength λ (= 0.5–2.0) on the hydrodynamic performance of a travelling wavy foil of a constant length is extensively investigated. The relationship of time-mean thrust with St, Re and λ is presented, suggesting that the propulsive force increases with increasing St, Re and λ. As such, the drag–thrust boundary advances as these parameters increase. A shorter λ makes the thrust steadier while a longer λ enhances the maximum instantaneous thrust. The latter is beneficial for prey to escape from a predator. The fluid added mass caused by the foil oscillation increases with St and λ but declines with Re (<500). Seven types of wake structures produced by the foil are identified, discussed and connected to thrust generation, showing how St, Re and λ affect the fluid dynamics, wake transition, vortex strength, wake jet, velocity, added mass, added damping, power input, efficiency and pressure profiles. The outcome of this work renders a physical basis for understanding the swimming of aquatic animals.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic performance of slender swimmer: effect of travelling wavelength

2022

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“…This finding may be used to understand that the living beings change their propulsive organism to an asymmetrical geometry to actively control the flow field. [32,33] Moreover, we theoretically consider the effect of asymmetrical geometry on the wake's instability. For the arbitrary asymmetrical foil, a predicted work is performed to access the deviation of the rBvK wake in the incompressible Newtonian fluid with a uniform laminar flow.…”

Section: Resultsmentioning

confidence: 99%

Effect of the asymmetric geometry on the wake structures of a pitching foil

2018

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The two-dimensional wake produced by a time-periodic pitching foil with the asymmetric geometry is investigated in the present work. Through numerically solving nonlinear Navier-Stokes equations, we discuss the relationship among the kinematics of the prescribed motion, the asymmetric parameter K ranged as −1 ≤ K ≤ 1, and the types of the wakes including the mP+nS wake, the Bénard-von Kármán wake, the reverse Bénard-von Kármán wake, and the deviated wake. Compared with previous studies, we reveal that the asymmetric geometry of a pitching foil directly affects the foil's wake structures. The numerical results show that the reverse Bénard-von Kármán wake is easily deviated at K < 0, while the symmetry-breaking of the reverse Bénard-von Kármán wake is delayed at K > 0. Through the vortex dynamic method, we understand that the initial velocity of the vortex affected by the foil's asymmetry plays a key role in the deviation of the reverse Bénard-von Kármán wake. Moreover, we provide a theoretical model to predict the wake deviation of the asymmetric foil.

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“…The unmanned underwater vehicle (UUV), as an underwater unmanned intelligent mobile platform, has broad application prospects and huge potential value in the exploration of marine resources, marine scientific investigations, and in the military and other fields [ 1 ]. The technology of UUVs involves many disciplines and fields; one of the key technologies is the underwater propulsion [ 2 , 3 , 4 ]. Traditional propeller propulsion technology has irreplaceable advantages in practical applications, and the theoretical research and practical applications have been mature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Frequency–Amplitude Parameter and Aspect Ratio on Propulsion Performance of Underwater Flapping-Foil

Ding,

Chen,

Zhu

et al. 2024

Biomimetics

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The propulsion system is the core component of unmanned underwater vehicles. The flapping propulsion method of marine animals’ flippers, which allows for flexibility, low noise, and high energy utilization at low speeds, can provide a new perspective for the development of new propulsion technology. In this study, a new experimental flapping propulsion apparatus that can be installed in both directions has been constructed. The guide rail slider mechanism can achieve the retention of force in the direction of movement, thereby decoupling thrust, lift, and torque. Subsequently, the motion parameters of frequency–amplitude related to the thrust and lift of a bionic flapping-foil are scrutinized. A response surface connecting propulsion efficiency and these motion parameters is formulated. The highest efficiency of the flapping-foil propulsion is achieved at a frequency of 2 Hz and an amplitude of 40°. Furthermore, the impact of the installation mode and the aspect ratio of the flapping-foil is examined. The reverse installation of the swing yields a higher thrust than the forward swing. As the chord length remains constant and the span length increases, the propulsive efficiency gradually improves. When the chord length is extended to a certain degree, the propulsion efficiency exhibits a parabolic pattern, increasing initially and then diminishing. This investigation offers a novel perspective for the bionic design within the domain of underwater propulsion. This research provides valuable theoretical guidance for bionic design in the underwater propulsion field.

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A review of underwater bio-mimetic propulsion: cruise and fast-start

Cited by 18 publications

References 63 publications

Hydrodynamic performance of slender swimmer: effect of travelling wavelength

Hydrodynamic performance of slender swimmer: effect of travelling wavelength

Effect of the asymmetric geometry on the wake structures of a pitching foil

Effect of Frequency–Amplitude Parameter and Aspect Ratio on Propulsion Performance of Underwater Flapping-Foil

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