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漂浮式潮流能装置载体的波浪运动响应使水平轴叶轮的水动力特性发生变化。采用滑移网格及动网格技术对无界均匀来流中旋转叶轮强迫纵摇时的三维水动力特性进行分析,研究不同纵摇频率、纵摇幅值、速比等参数对叶轮水动力的影响规律,以及根据叶轮纵摇运动时的水动力时历曲线,拟合得到叶轮的纵摇阻尼系数。研究表明:叶轮轴向载荷和能量利用率瞬时值产生波动,波动幅值随纵摇频率、纵摇幅值及速比的增大而增大;叶片表面压力分布时刻发生变化,纵摇频率、纵摇幅值及速比越大,变化越明显;纵摇阻尼系数与纵荡频率、振幅无关,而与叶轮旋转速度相关,旋转速度越大,阻尼系数越大。
The wave motion response of the floating tidal current energy device carrier changes the hydrodynamic characteristics of the horizontal axis impeller. The three-dimensional hydrodynamic characteristics of the rotating impeller in forced flow with unbounded uniform flow were analyzed by means of sliding grid and moving grid technique. The effects of different pitch frequency, pitch amplitude and speed ratio on the hydrodynamic The law of influence, and according to the hydrodynamic calendar of the impeller during the pitch motion, fitting the impeller’s longitudinal damping coefficient. The results show that the instantaneous value of impeller axial load and energy utilization fluctuate, and the amplitude of fluctuation increases with the increase of pitch frequency, pitch amplitude and speed ratio. The pressure distribution on blade surface changes with time, pitch frequency, The larger the amplitude and speed ratio, the more obvious the change is. The damping coefficient is independent of the longitudinal frequency and amplitude, but is related to the rotational speed of the impeller. The larger the rotational speed is, the larger the damping coefficient is.