Parametric Analysis for Underwater Flapping Foil Propulsor
| Autor: | Weichao Shi, Dong Yu, Junwei Zhou, Lei Mei, Pan Xiaoyun, Mingyang Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Airfoil
020209 energy Acoustics VM Geography Planning and Development 02 engineering and technology active flapping foil computational fluid dynamics Aquatic Science Computational fluid dynamics Propulsion 01 natural sciences Biochemistry 010305 fluids & plasmas Range (aeronautics) 0103 physical sciences 0202 electrical engineering electronic engineering information engineering TD201-500 Water Science and Technology Physics Water supply for domestic and industrial purposes Angle of attack business.industry propulsive efficiency Hydraulic engineering Amplitude Propulsor parametric analysis open water performance analysis business TC1-978 Propulsive efficiency |
| Zdroj: | Water, Vol 13, Iss 2103, p 2103 (2021) Water Volume 13 Issue 15 |
| ISSN: | 2073-4441 |
| Popis: | This paper researched into the harmonic and anharmonic underwater flapping foil propulsion systems to improve the efficiency of these bioinspired propulsors. The angle of attack, the pitching angle, the heaving amplitude, and the phase difference are parametrically investigated in this paper. A rigid two-dimensional NACA (National Advisory Committee for Aeronautics) 0012 airfoil is modeled with the aid of a commercial computational fluid dynamics software, FINE™/Marine. Unsteady Reynolds Average Navier-Stokes (URANS) equation is solved together with dynamic mesh to simulate the foil motion. The investigation first verifies the reliability of the developed modeling method against the benchmark data. Then, the systematic investigation is conducted and identifies that the heaving amplitude is most influential factor for the propulsion efficiency. Secondly, phase difference also has a significant influence on efficiency, but this effect is related to the reference working condition, which needs further study. Then, the pitching amplitude has little effect on the maximum efficiency value of flapping foil, while it will affect its optimal speed range. When the heaving amplitude ratio reaches 3 and the corresponding maximum angle of attack is about 9°, the maximum efficiency can reach 87%. The effect of anharmonic motion on the efficiency is very small and varies with the St number, but in summary, it can maintain the peak efficiency over a wider range of operations. In addition, the force and flow field characteristics of different efficiency points are compared and analyzed to distinguish their corresponding relationship with the propulsion efficiency. |
| Databáze: | OpenAIRE |
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