采用水轮机旋转运动与强迫纵荡运动的组合模拟水轮机的波浪运动响应，并应用ANSYS CFX 软件对均匀来流中水轮机强迫纵荡时的流场和水动力特性进行分析，研究不同纵荡频率和纵荡幅值对水轮机水动力的影响规律.研究表明：与水轮机在均匀来流环境中仅做旋转运动相比，纵荡使水轮机尾涡间距发生疏密变化；水轮机水动力载荷瞬时值的峰值包络线均值产生较大波动，波动频率为水轮机纵荡频率，波动幅值随纵荡频率和纵荡幅值的增加而增加；载荷波动范围的最大值随纵荡频率和纵荡幅值的增加逐渐增加，而最小值却逐渐减小.研究结果可为潮流电站电能输出控制系统及水轮机结构强度校核提供参考.
Under the condition of actual sea state, hydrodynamic characteristic of variable-pitch vertical axis tidal turbine is related to wave characteristics and floating carrier wave motion response. This paper simulates the wave response motion of the variable-pitch vertical axis tidal turbine by combining the turbine rotation and the axial forced surge. Using ANSYS CFX software, we analyze the flow field and hydrodynamic performance of the turbine with forced surge in the uniform flow, and study the influences rule of different surge frequencies and surge amplitudes on turbine hydrodynamic performance. The research results showed that compared with the turbine which only has rotation motion in the uniform flow, the surge motion leads to the change in the interval of wake vortex. The peak envelope mean value of turbine hydrodynamic loads makes an obvious fluctuation in surging. The fluctuation frequency is equal to the turbine’s surge frequency, and the fluctuation amplitudes have a positive correlation with the frequency and amplitude of the surge. The maximum fluctuation range of hydrodynamic loads gradually increases with the increasing frequency and increasing amplitude of the surge, while the minimum gradually reduces. The results of this study can provide a reference for turbine structural strength check.
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