NUMERICAL AND EXPERIMENTAL STUDY OF FLOW FIELD CHARACTERISTICS OF TIDAL ENERGY TURBINES

Jing Fengmei; Wang Yi; Guo Bin; Liu Yang; Li Sirui

doi:10.19912/j.0254-0096.tynxb.2023-0558

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (8) : 660-667. DOI: 10.19912/j.0254-0096.tynxb.2023-0558

NUMERICAL AND EXPERIMENTAL STUDY OF FLOW FIELD CHARACTERISTICS OF TIDAL ENERGY TURBINES

Jing Fengmei¹, Wang Yi¹, Guo Bin², Liu Yang³, Li Sirui¹

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Abstract

This article combines numerical simulations and model experiments to study the influence of flow field characteristics on the hydrodynamic performance of turbines in the near-field. The effect of different factors such as inflow velocity and tip-speed ratio on the wake field characteristics in the far-field is analyzed. The research results show that the relative error of power coefficient between the numerical simulation result （0.37） and the experimental result （0.36） is 0.3% at the designed tip speed ratio, and the relative error of drag coefficient between the numerical simulation result （0.73） and the experimental result （0.76） is -4%. There are significant three-dimensional flow phenomena at the blade tip of the tidal turbine, there is a radial velocity （0.24 m/s） at the front of the turbine disk which flows from the blade root to the tip, and there is a radial velocity （0.14 m/s） at the rear of the turbine disk which flows from the blade tip to the root. The downwash flow velocity near the wake zone of the blade tip causes a decrease in the energy conversion efficiency of the turbine. The inflow velocity has no a significant impact on the recovery of axial velocity in the wake region; In the near wake region （within 5D distance from the disk）, with the increase of tip-speed ratio, the recovery of axial velocity in the wake shows a gradually decreasing trend. When the distance from the water turbine disk exceeds 10D, the tip-speed ratio does not have a significant effect on the recovery of axial velocity in the wake. However, the increase of tip-speed ratio will shorten the existence time of the blade vortex and make the location where the blade vortex is broken closer to the water turbine disk.

Key words

tidal energy / numerical simulation / model test / water turbine / flow field characteristics / praticle image velocimetry（PIV） / hydrodynamic characteristic

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Jing Fengmei, Wang Yi, Guo Bin, Liu Yang, Li Sirui. NUMERICAL AND EXPERIMENTAL STUDY OF FLOW FIELD CHARACTERISTICS OF TIDAL ENERGY TURBINES[J]. Acta Energiae Solaris Sinica. 2024, 45(8): 660-667 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0558

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