论文部分内容阅读
漂浮式潮流能装置载体的艏摇波浪运动响应会使变偏角垂直轴水轮机的水动力特性发生变化。采用动网格技术,应用ANSYS CFX软件对均匀来流中水轮机发生旋转和艏摇耦合运动时的水动力特性进行分析,研究不同艏摇频率和艏摇幅值对水轮机水动力载荷的影响规律。研究结果表明:与水轮机仅做旋转运动相比,艏摇使水轮机出现类似卡门涡街的尾迹,且涡间距随艏摇频率的增加而减小;水轮机水动力载荷的峰值包络线均值产生较大波动,波动频率为水轮机艏摇频率,波动幅值随艏摇频率和艏摇幅值的增加而减小;载荷波动范围的最大值随艏摇频率和艏摇幅值的增加逐渐增加,而最小值却逐渐减小。研究结果可为水轮机结构强度校核提供参考。
The fluctuating wave motion response of the floating tidal current energy device carrier will change the hydrodynamic characteristics of the turbine with variable angle vertical axis. Using dynamic grid technology, the hydrodynamic characteristics of the turbines in a uniform flow were analyzed by using ANSYS CFX software. The influence of different swaying frequencies and swaying amplitude on the hydrodynamic load of the turbine was studied. The results show that, compared with the turbine only turning motion, the rocking makes the turbine wake similar to Karman vortex shedding, and the vortex spacing decreases with the increase of the rocking frequency. The average value of the peak envelope of turbine hydrodynamic load is The fluctuating frequency is the turbulence frequency of turbine, and the amplitude of turbulence decreases with the increasing of the turbulence frequency and the amplitude of turbulence. The maximum value of the range of turbulence of the load increases with the increasing of the turbulence frequency and 艏The minimum value is gradually reduced. The results can provide a reference for the structural strength check of hydraulic turbine.