变偏角垂直轴水轮机艏摇运动水动力分析

摘要

In order to study the influence of the yawing motion response of the floating tidal power carrier in waves on the hydrodynamic characteristics of the variable-pitch vertical axis tidal turbine,This paper applies the ANSYS CFX software to analyze the hydrodynamic characteristic in uniform stream when the turbine experiences rotation and yawing coupling motion by dynamic mesh,and studies the influences of different yaw frequency and amplitude on turbine hydrodynamic performance. The research results show that compared with the case when the turbine only has rotation motion in the uniform flow,the yaw motion leads to the wake which is similar to Karman Vortex Street, and the interval of wake vortex decreases with increasing of yaw frequency;the peak envelope's mean value of tur-bine hydrodynamic loads makes an obvious fluctuation in yawing,the fluctuation frequency is equal to the turbine' s yaw frequency,and the fluctuation amplitude decreases with the increase of frequency and amplitude of the yaw;the maximum fluctuation range of hydrodynamic loads increases gradually with the increasing yaw frequency and yaw amplitude,while the minimum is gradually reduced. The results of this study can provide a reference for tur-bine structural strength check.%为了研究漂浮式潮流能装置载体的艏摇波浪运动响应对变偏角垂直轴水轮机水动力特性的影响规律,本文采用动网格技术,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艉迹,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.