安装高程对潮流能水轮机尾迹特性影响试验研究

为探究安装高程对潮流能水轮机尾迹特性的影响,以模型潮流能水轮机为研究对象,采用ADV采集尾流场速度数据,对比分析不同高程下的尾流场特性,揭示安装高程对潮流能水轮机尾迹特性的影响规律.结果表明:随着安装高程的增加,转轮后方尾流速恢复速度逐渐加快,而湍流强度和雷诺切应力恢复速度有逐渐减小的趋势;横向尾流场水动力特性沿转轮中...

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.