【摘要】 针对叶尖小翼在偏航工况下对水平轴潮流能水轮机性能影响不明确的问题，本研究基于计算流体力学(Computational fluid mechanics, CFD)方法建立了水平轴潮流能水轮机数值模型，并通过水槽实验进行了模型验证。此后，在0°～30°的来流偏角范围内，对比分析了有、无叶尖小翼的潮流能水轮机的水动力学性能和尾流特性。研究结果显示，偏航角较小时(不超过12°),带叶尖小翼的水轮机获能系数(C_P)反而呈上升的趋势；但随着偏航角的持续增大，C_P也会出现明显的下降。在此过程中，机组受到推力系数(C_T)的变化趋势与C_P一致。综合来看，叶尖小翼的设计有助于水轮机在偏航工况下保持其性能，避免了扫略面积的快速下降。更多还原

【Abstract】 A winglet at the blade tip can significantly improve the power efficiency of a horizontal-axis tidal turbine. However, in real sea conditions, tidal turbine often need to operate under certain yaw angles. It is not yet known how a winglet may affect the performance of tidal turbines under yaw conditions. In this study, a numerical model of a horizontal axis tidal turbine is established using computational fluid dynamics(CFD) method and validated through experimental tests in a wave tank. Subsequently, the hydrodynamic performance and wake characteristics of a tidal turbine with and without a winglet is compared and analyzed under incoming flow yaw angles ranging from 0° to 30°. The research results showed that when the yaw angle was small(No more than 12°), a tidal turbine with winglets tends to have an increase in power coefficient C_P; however, as the yaw angle continued to increase, C_P shows a significant decrease. During this process, the change trend of axial load coefficient C_T of the turbine is consistent with that of C_P. Overall, a winglet at the blade tips can prevent rapid decline of swept area for tidal turbines under yaw conditions, thereby keeping the performance of the tidal turbine.更多还原