论文标题
部分可观测时空混沌系统的无模型预测
High-Order Large-Eddy Simulations of a Wind Turbine in Ducted and Open-Rotor Configurations
论文作者
论文摘要
进行高阶大型模拟，以研究以不同的尖端速度比率运行的风力涡轮机的性能和流场。为了评估管道的效果，还对相应的开放式涡轮机进行了相同尖端速度比的模拟。发现管道的涡轮始终获得的功率输出量比开放式旋转器的功率更高，并且管道本身增强了流动湍流和叶片尾随边缘涡流，但削弱了尖端和轮毂涡流。以最大的尖端速度比观察到流动分叉，并被确定是由叶片阻塞效应引起的。在不同的偏航角下，在两个涡轮机上也进行了比较模拟。注意到，与开放式偏航角相比，管道配置对小偏航角不敏感，并且保持更高的功率输出。此外，观察到，随着偏航角的增加，两种配置的唤醒恢复更快。
High-order large-eddy simulations are performed to study the performance and flow field of a ducted wind turbine operating at different tip speed ratios. To evaluate the effects of the duct, simulations with the same tip speed ratios are also performed on the corresponding open-rotor turbine. It is found that the ducted turbine consistently obtains higher power outputs than the open-rotor counterpart, and the duct itself enhances flow turbulence and blade trailing-edge vortices but weakens tip and hub vortices. Flow bifurcation is observed at the largest tip speed ratio and is identified to be caused by blade blockage effects. Comparative simulations are also performed on both turbines under different yaw angles. It is noticed that the ducted configuration is insensitive to small yaw angles and maintains higher power outputs than the open-rotor configuration at all yaw angles. Moreover, it is observed that the wakes of both configurations recover more quickly as the yaw angle increases.
