Forces on a pitching plate: An experimental and numerical study |
| |
| Institution: | 1. French Naval Academy Research Institute – IRENav EA3634, Brest, France;2. Aix Marseille University, CNRS, Centrale Marseille, IRPHE, Marseille, France;1. Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming 650500, China;2. School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2600, Australia;1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi''an, 710072, People''s Republic of China;2. Key Laboratory of Unmanned Underwater Vehicle, Northwestern Polytechnical University, Xi''an, 710072, PR China;1. Swinburne University of Technology, Hawthorn, Victoria 3122, Australia;2. Université de Toulouse; INP; IMFT (Institut de Mécanique des Fluides de Toulouse), Allée Camille Soula, F-31400 Toulouse, France;3. CNRS; IMFT, F-31400 Toulouse, France;4. Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, Victoria 3800, Australia;1. Department of Aerodynamics, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing, Jiangsu 210016, China;2. Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design, Yudao Street 29, Nanjing, Jiangsu 210016, China |
| |
| Abstract: | A flat plate in pitching motion is considered as a fundamental source of locomotion in the general context of marine propulsion. The experimental as well as numerical investigation is carried out at a relatively small Reynold number of 2000 based on the plate length c and the inflow velocity U∞. The plate oscillates sinusoidally in pitch about its 1/3 ? c axis and the peak to peak amplitude of motion is 20°. The reduced frequency of oscillation k = πfc/U∞ is considered as a key parameter and it may vary between 1 and 5. The underlying fluid-structure problem is numerically solved using a compact finite-differences Navier–Stokes solution procedure and the numerical solution is compared with Particle Image Velocimetry (PIV) measurements of the flow field around the pitching foil experimental device mounted in a water-channel. A good agreement is found between the numerical and experimental results and the threshold oscillation frequency beyond which the wake exhibits a reverse von Kármán street pattern is determined. Above threshold, the mean velocity in the wake exhibits jet-like profiles with velocity excess, which is generally considered as the footprint of thrust production. The forces exerted on the plate are extracted from the numerical simulation results and it is shown, that reliable predictions for possible thrust production can be inferred from a conventional experimental control volume analysis, only when besides the wake's mean flow the contributions from the velocity fluctuation and the pressure term are taken into account. |
| |
| Keywords: | Pitching plate Thrust Experiment Numerical simulation |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
