Numerical investigation of auto-pitch wing-in-ground effect oscillating foil propulsor |
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| Institution: | 1. Australian Maritime College, University of Tasmania, Launceston, Tasmania, 7250, Australia;2. School of Marine Science and Ocean Engineering, Harbin Institute of Technology, Weihai, Shandong, 264209, China;1. Key Laboratory of Research on Marine Hazards Forecasting, National Marine Environmental Forecasting Center, No 8 Dahuisi Road, Haidian District, Beijing, China;2. Second Institute of Oceanography, MNR, No 36 Baochubei Road, Hangzhou, 310012, China;3. Key Laboratory of Habor, Coastal and Offshore Engineering, Beibu Gulf University, No 12 Binhai Avenue, Binhai New Town, Qinzhou, 535011, China;1. Department of Marine Environment and Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan;2. Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, Taiwan;1. Oceans Graduate School, Faculty of Engineering and Mathematical Sciences, University of Western Australia, M053, Perth WA, 6009, Australia;2. Woodside Energy Ltd., Perth, WA 6000, Australia;1. Department of Naval Architecture, Dalian University of Technology, Dalian 116023, PR China;2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, PR China;1. Jiangsu University of Science and Technology, Zhenjiang, China;2. Norwegian University of science and technology, Norway;3. EPAM Systems Inc., Ukraine;4. Florida Institute of Technology, Melbourne, USA |
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| Abstract: | The propulsive characteristics of auto-pitch wing-in-ground effect oscillating foil propulsors (APWIGs) were numerically investigated through an unsteady Reynolds Averaged Navier-Stokes solver. The kinematics of such a biplane configuration is characterized by the prescribed heave motion and flow-induced pitch motion restrained by a torsional spring for each foil. Based on the validated numerical model, the comparison of propulsive performance between APWIGs and single auto-pitch oscillating foil, as well as dual-foil heave-only configuration, was conducted at different advance speeds. Results show that APWIGs is advantageous in both thrust production and efficiency enhancement over other two configurations due to the resulting wing-in-ground effect and substantial reduction of flow separation by the flow-regulated pitch motion. Furthermore, the effect of torsional spring stiffness on the propulsion of APWIGs was studied under different loaded conditions. It was found that both the maximum pitching angle and phase difference of pitch with heave are dramatically affected by the spring stiffness, which has major contribution to the hydrodynamic behaviours of the foils. Under a certain operating speed, an optimal torsional spring stiffness that produces the best propulsive performance can be found. With respect to the parametric space in the current study, the APWIGs can achieve a constant high efficiency over 70% by employing an appropriate spring stiffness. |
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| Keywords: | Biomimetic propulsion Oscillating foil Wing-in-ground effect Auto-pitch Computational fluid dynamics |
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