A Study of the Near Wake Deformation of the X‐Rotor Vertical‐Axis Wind Turbine With Pitched Blades

Wind Energy Pub Date : 2024-08-08 DOI:10.1002/we.2944

D. Bensason, A. Sciacchitano, Adhyanth Giri Ajay, Carlos Simao Ferreira

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Abstract

Recent studies have revealed the large potential of vertical‐axis wind turbines (VAWTs) for high‐energy‐density wind farms due to their favorable wake recovery characteristics. The present study provides an experimental demonstration and proof‐of‐concept for the wake recovery mechanism of the novel X‐Rotor VAWT. The phase‐locked flowfield is measured at several streamwise locations along the X‐Rotor's wake using stereoscopic particle image velocimetry (PIV) with fixed‐pitch offsets applied to the blades. The streamwise vortex system of the upper half of the X‐Rotor is first hypothesized and then experimentally verified. The induced wake deformations of the vortex systems are discussed in comparison with previous studies concerning traditional H‐type VAWTs. The results suggest that positive blade pitch is more favorable for accelerated wake recovery due to the dominant tip‐vortex generated on the upwind windward quadrant of the cycle. Utilizing theoretical blade load variations along the span explains distinct unsteady flow features in the near wake generated at select quadrants of the rotor rotation, shedding light on the potential of the two pitch schemes.

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带倾斜叶片的 X-Rotor 垂直轴风力涡轮机近风口变形研究

最近的研究表明，由于垂直轴风力涡轮机（VAWT）具有良好的尾流恢复特性，因此在高能量密度风电场中具有巨大潜力。本研究对新型 X-Rotor VAWT 的尾流恢复机制进行了实验演示和概念验证。使用立体粒子图像测速仪 (PIV)，在叶片固定间距偏移的情况下，沿 X-Rotor 的尾流在多个流向位置测量锁相流场。首先对 X-Rotor 上半部的流向涡流系统进行了假设，然后进行了实验验证。通过与之前有关传统 H 型 VAWT 的研究进行比较，讨论了涡流系统的诱导尾流变形。结果表明，正叶片间距更有利于加速尾流恢复，这是因为在循环的上风风向象限产生了主要的叶尖涡流。利用沿跨度的理论叶片载荷变化，可以解释在转子旋转的选定象限产生的近尾流中的独特不稳定流特征，从而阐明两种变桨方案的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Wind Energy

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