Abstract Two vertical-axis wind turbines (VAWTs) benefit from a power increase when placed side by side in close proximity. To study the potential of paired VAWTs for integration in wind farms, wind tunnel wake measurements of lift-driven VAWTs are compared for isolated and three counter-rotating configurations. Because the wake of an isolated VAWT is deflected, the direction of rotation significantly influences the wake of paired VAWTs. The wake of counter-rotating VAWTs where the adjacent blades move downwind, exhibits a similar length, width and replenishment as the wake of an isolated VAWT. The wake of counter-rotating VAWTs with adjacent upwind moving blades, however, significantly differs from an isolated VAWT wake. While its wake length is similar to an isolated VAWT wake, its width and replenishment are not. Because of appealing wake characteristics, paired VAWTs exhibit unique advantages for wind farm applications, and especially for offshore floating wind farms.

中文翻译：

---

成对垂直轴风力涡轮机后尾流的实验表征

摘要 当两个垂直轴风力涡轮机 (VAWTs) 并排放置时，会从功率增加中受益。为了研究成对 VAWT 在风电场中集成的潜力，比较了隔离和三个反向旋转配置的升力驱动 VAWT 的风洞尾流测量。由于孤立的 VAWT 的尾流被偏转，旋转方向显着影响成对 VAWT 的尾流。相邻叶片顺风移动的反向旋转 VAWT 的尾流显示出与孤立的 VAWT 尾流相似的长度、宽度和补给。然而，具有相邻逆风动叶片的反向旋转 VAWT 的尾流与孤立的 VAWT 尾流有显着不同。虽然它的尾流长度类似于孤立的 VAWT 尾流，但它的宽度和补给不是。