Application of 2D Numerical Model to Unsteady Performance Evaluation of Vertical-Axis Tidal Current Turbine  

作　　者：LIU Zhen QU Hengliang SHI Hongda HU Gexing HYUN Beom-Soo LIU Zhen;QU Hengliang;SHI Hongda;HU Gexing;HYUN Beom-Soo(Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China;Qingdao Municipal Key Laboratory of Ocean Renewable Energy, Ocean University of China;College of Engineering, Ocean University of China;College of Ocean Science and Technology, Korea Maritime and Ocean University)

机构地区：[1]Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China [2]Qingdao Municipal Key Laboratory of Ocean Renewable Energy, Ocean University of China [3]College of Engineering, Ocean University of China [4]College of Ocean Science and Technology, Korea Maritime and Ocean University

出　　处：《Journal of Ocean University of China》2016年第6期977-986,共10页中国海洋大学学报（英文版）

基　　金：the financial support provided by the National Natural Science Foundation of China (51279190 and 51311140259);National High Technology Research and Development Program of China (863 Project,2012AA052601);Shandong Natural Science Funds for Distinguished Young Scholar (JQ201314);Qingdao Municipal Science & Technology Program (13-4-1-38hy and 14-9-1-5-hy);the Program of Introducing Talents of Discipline to Universities (111 Project,B14028)

摘　　要：Abstract Tidal current energy is renewable and sustainable, which is a promising altemative energy resource for the future elec- tricity supply. The straight-bladed vertical-axis turbine is regarded as a useful tool to capture the tidal current energy especially under low-speed conditions. A 2D unsteady numerical model based on Ansys-Fluent 12.0 is established to conduct the numerical simulation, which is validated by the corresponding experimental data. For the unsteady calculations, the SST model, 2x 105 and 0.01 s are se- lected as the proper turbulence model, mesh number, and time step, respectively. Detailed contours of the velocity distributions around the rotor blade foils have been provided for a flow field analysis. The tip speed ratio （TSR） determines the azimuth angle of the appearance of the torque peak, which occurs once for a blade in a single revolution. It is also found that simply increasing the incident flow velocity could not improve the turbine performance accordingly. The peaks of the averaged power and torque coeffi- cients appear at TSRs of 2.1 and 1.8, respectively. Furthermore, several shapes of the duct augmentation are proposed to improve the turbine performance by contracting the flow path gradually from the open mouth of the duct to the rotor. The duct augmentation can significantly enhance the power and torque output. Furthermore, the elliptic shape enables the best performance of the turbine. The numerical results prove the capability of the present 2D model for the unsteady hydrodynamics and an operating performance analy- sis of the vertical tidal stream turbine.Tidal current energy is renewable and sustainable, which is a promising alternative energy resource for the future electricity supply. The straight-bladed vertical-axis turbine is regarded as a useful tool to capture the tidal current energy especially under low-speed conditions. A 2D unsteady numerical model based on Ansys-Fluent 12.0 is established to conduct the numerical simulation, which is validated by the corresponding experimental data. For the unsteady calculations, the SST model, 2×10~5 and 0.01 s are selected as the proper turbulence model, mesh number, and time step, respectively. Detailed contours of the velocity distributions around the rotor blade foils have been provided for a flow field analysis. The tip speed ratio(TSR) determines the azimuth angle of the appearance of the torque peak, which occurs once for a blade in a single revolution. It is also found that simply increasing the incident flow velocity could not improve the turbine performance accordingly. The peaks of the averaged power and torque coefficients appear at TSRs of 2.1 and 1.8, respectively. Furthermore, several shapes of the duct augmentation are proposed to improve the turbine performance by contracting the flow path gradually from the open mouth of the duct to the rotor. The duct augmentation can significantly enhance the power and torque output. Furthermore, the elliptic shape enables the best performance of the turbine. The numerical results prove the capability of the present 2D model for the unsteady hydrodynamics and an operating performance analysis of the vertical tidal stream turbine.

关 键 词：tidal current energy vertical-axis turbine unsteady numerical model duct augmentation average power coefficient tip speed ratio 

分 类 号：P743[天文地球—海洋科学]