Flow dynamics inside the rotor of a three straight bladed cross-flow turbine |
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| Institution: | 1. University of Bamenda, Faculty of Sciences, Department of Physics, P.O. Box 39, Bambili, Cameroon;2. Sfax Faculty of Sciences, Department of Physics, Laboratory of Applied Physics (L.P.A), Sfax, Tunisia;3. Research Unit of Mechanics and Energetic (URME), National Engineering School of Tunis, 1002 Tunis, Tunisia;1. Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia;2. Faculty of Engineering and Technology, Arab Academy for Science and Technology and Maritime Transport, 1029, Alexandria, Egypt;3. Marine Technology Center, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia;4. Dept. of Naval Architecture and Marine Engineering, Faculty of Engineering, Alexandria University, Alexandria, Egypt;1. Division of Ocean Systems Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;2. Department of Systems Innovation, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. KAIST Ocean Technology Center (KOTC), Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea;1. Graduate School, Department of Mechanical Engineering, Mokpo National University, Muan-gun 530-729, Jeollanam-do, Republic of Korea;2. Department of Mechanical Engineering, Institute of New and Renewable Energy Technology Research, Mokpo National University, Muan-gun 530-729, Jeollanam-do, Republic of Korea;1. Department of Industrial Engineering, University of Florence, Via di Santa Marta 3, 50139 Florence, Italy;2. CNR-ICCOM, National Research Council of Italy, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy;1. Lab. of Fluid Dynamics and Technical Flows, University of Magdeburg “Otto von Guericke”, Universitätsplatz 2, Magdeburg D-39106, Germany;2. Windpower4u, Tröbigauer Str. 1a, Schmölln-Putzkau D-01877, Germany;3. VENTEGO AG, Chemnitzer Straße 75, Limbach-Oberfrohna D-09212, Germany |
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| Abstract: | In this work we study experimentally the flow dynamics inside the rotor of a three straight-bladed Cross-Flow Turbine (CFT). The CFT model used in the experiments is based on symmetric NACA-0015 profiles, with a chord to rotor diameter ratio of 0.16. The turbine model was designed in order to quantify the flow inside and around the rotor using planar Digital Particle Image Velocimetry (DPIV). Tests were made by forcing the rotation of the turbine with a DC motor, which provided precise control of the Tip Speed Ratio (TSR), while being towed in a still-water tank at a constant turbine diameter Reynolds number of 6.1 × 104. The range of TSRs covered in the experiments went from 0.7 to 2.3.The focus is given to the analysis of the blade-wake interactions inside the rotor. The investigation has allowed us to relate the interactions with the performance differences in this type of turbines, as a function of the operational tip speed ratio. |
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| Keywords: | Cross-flow turbines Darrieus rotors H-rotors Straight-bladed turbines Vertical axis wind turbines |
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