Results 21 to 30 of about 8,361,162 (295)
Numerical Investigation of the Semi-Active Flapping Foil of the Wave Glider
Journal of Marine Science and Engineering, 2019 A numerical investigation is conducted to study the propulsive performance of the semi-active flapping foil of the wave glider, where the heaving smotion is fully prescribed, and the pitching motion is determined by the hydrodynamic force and torsion ...
Zhanfeng Qi +6 more
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A Computational Fluid Dynamics Investigation of a Flapping Hydrofoil as a Thruster
Biomimetics, 2023 The paper features a computational fluid dynamics study of a flapping NACA0015 hydrofoil moving with a combination of sinusoidal heaving and pitching. Several kinematic configurations are explored, varying sequentially pitch and heave amplitude, Strouhal
Luca Alberti +3 more
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Performance optimization of the gasdynamic mirror propulsion system [PDF]
34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998 Nuclear fusion appears to be a most promising concept for producing extremely high specific impulse rocket engines. Engines such as these would effectively open up the solar system to human exploration and would virtually eliminate launch window restrictions. A preliminary vehicle sizing and mission study was performed based on the conceptual design of
Emrich, William J., Kammash, Terry B.
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Predicting the NACA0012-IK30 Airfoil Propulsive Capabilities with a Panel Method
Engineering Proceedings, 2023 Unsteady airfoils play a pivotal role in comprehending diverse aerospace applications, being one of those flapping propulsions. The present paper studies this topic by bringing back an old unsteady panel method to juxtapose its results against CFD data ...
Emanuel A. R. Camacho +2 more
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Swimming mechanics and propulsive efficiency in the chambered nautilus [PDF]
Royal Society Open Science, 2018 The chambered nautilus (Nautilus pompilius) encounters severe environmental hypoxia during diurnal vertical movements in the ocean. The metabolic cost of locomotion (Cmet) and swimming performance depend on how efficiently momentum is imparted to the ...
Thomas R. Neil, Graham N. Askew
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Optimal Design and Dynamic Analysis of Hydrofoil Mechanism of Wave Glider
Journal of Marine Science and Engineering, 2022 A wave glider can convert vertical wave motion into its forward propulsion. There are many factors affecting the propulsion performance of a wave glider.
Hongqiang Sang +5 more
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Effects of Regular Waves on Propulsion Performance of Flexible Flapping Foil
Applied Sciences, 2018 The objective of the present study is to analyze the effects of waves on the propulsive performance and flow field evolution of flexible flapping foil, and then offer a way to take advantage of wave energy.
Peng Liu +4 more
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A new type of biomimetic fish with oscillatory propulsion method
MATEC Web of Conferences, 2017 The traditional multi joint mechanical serial parallel structure biomimetic fish has lower propulsive efficiency, more energy transmission loss, more complicated mechanical design and control algorithms because of more mechanical joints.
Lei Zhang +3 more
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A Biomimetic Flexible Fishtail Embedded With Shape Memory Alloy Wires
IEEE Access, 2019 In this paper, a biomimetic flexible fishtail actuated by shape memory alloy (SMA) wires is presented. The detailed structure of the fishtail propeller is designed to mimic the muscle and bone structure of a Carassius auratus.
Jian Li +5 more
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Flow Interactions Between Low Aspect Ratio Hydrofoils in In-line and Staggered Arrangements
Biomimetics, 2020 Many species of fish gather in dense collectives or schools where there are significant flow interactions from their shed wakes. Commonly, these swimmers shed a classic reverse von Kármán wake, however, schooling eels produce a bifurcated wake topology ...
Melike Kurt +2 more
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