海底地形影响下潮流能水轮机尾流效应与输出功率特性研究

Study on Wake Effect and Power Output Characteristics of Tidal Energy Turbine Under the Influence of Seabed Topography

通过在循环水槽中开展物理模型实验,揭示海底地形影响下潮流能水轮机尾流场速度分布、湍流强度和输出功率特性,为潮流能发电微观选址和叶轮安装位置提供一定参考。研究结果表明:地形对于水轮机的水动力特性存在不同影响,小地形增加了水轮机后方近尾流区平均湍流强度,使其后方流场速度恢复略快于无地形的工况,且地形的增速效应提升了水轮机的输出功率;大地形工况下流场阻塞效应严重,对水轮机尾流恢复存在一定抑制作用,水轮机的输出功率也受到不规则湍流流场的影响而减小。

In this study, physical model experiments were performed in the circulating flume to investigate the turbine wake velocity, turbulence intensity and power output characteristics under the influence of seabed terrain. It could provide scientific guidance for the micro-site selection of tidal energy development and the installation position of turbine rotors. The research results suggest that the seabed terrain has different effects on the hydrodynamic characteristics of the turbine. The small terrain incorporated in the study increases the average turbulence intensity in the near wake area behind the turbine, and makes the flow velocity recovery slightly faster than the case of flat bed. The turbine gets benefit from such terrain, which leads to the increase of the output power of the turbine. In contrast to the small terrain, the flow field blockage effect is serious under the large terrain, which has a certain inhibitory effect on the recovery of the turbine wake velocity, and the output power of the turbine is also reduced due to the irregular turbulent flow generated by the large terrain.