Experimental study on influence of turbine setting elevation on wake characteristics of tidal turbine

In order to research the different wake characteristics of tidal turbine at different setting elevations, the velocity was measured by Acoustic Doppler Velocimeter (ADV) and the different wake characteristics were compared, the general wake distribution regulation were revealed at different working conditions. The results indicate that the recovery rate of velocity deficit is gradually increase, however the recovery rate of turbulence intensity and Reynolds shear stress gradually decrease as the growth of the turbine setting elevation. The different wake characteristics are nearly symmetrical along the center line of the runner at the transverse flow field, the wake velocity drift to the free surface at the longitudinal profile, while the turbulence intensity and Reynolds shear stress do not perform distinct same behavior. The different turbine setting elevations mainly affect the wake recovery rate at the downstream, however perform little influence on the wake characteristics along the depth and horizon. The support structure only perform a postive effect on the wake characteristics within[1.5D] at the near wake, while perform a negative effect at the far wake. © 2022, Solar Energy Periodical Office Co., Ltd. All right reserved.