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| Analysis of hydrodynamic performance and energy loss characteristics on tidal current turbine |
| SONG Ke1,2*, YANG Bangcheng3 |
| 1. School of Mechanical and Electrical Engineering, Kunming University, Kunming, Yunnan 650214, China;2. Shen Weiming Academician Workstation of Intelligent Manufacturing Technology in Yunnan(Kunming), Kunming University, Kunming, Yunnan 650214, China; 3. Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650500, China |
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Abstract In order to analyze the hydrodynamic performance of tidal turbine, and evaluate the location and mechanism of energy loss. A horizontal axis turbine was taken as the research object, a three-dimensional numerical simulation was carried out by introducing entropy generation theory model and using SST k-ω turbulence model. The results show that: the values of power coefficient(CP)and thrust coefficient(CT)of turbine first increase and then decrease with the increase of the tip speed ratio(TSR)under turbine operation conditions. The fluctuating instantaneous values of CP and CT of turbine at high TSR is larger than that at low TSR, and the value of viscous dissipation and turbulent dissipation entropy production increases versus TSRs at same inflow velocity. The turbulent dissipation entropy production is much larger than that of viscous dissipation entropy production, which reaches 99.56% to 99.65% among the total entropy production. Furthermore, the wake energy loss zone is located behind the blade tip and hub at low TSR, while the energy loss zone is mainly located behind the blade tip at high TSR. The energy loss intensity at high TSR is significantly greater than that at low TSR. Besides, the closer the different sections of turbine blades are to the blade tip, the more obvious the energy loss is. The above research results reveal the hydrodynamic flow characteristics and energy loss mechanism of ti-dal turbine, which offers a reference for the optimal design and energy loss identification.
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Received: 09 May 2021
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