Abstract In this paper we report on the design and testing of a novel vertical axis wind turbine (VAWT) system. The system consists of two counter-rotating VAWT rotors and a deflector that is placed between the two rotors. The system’s performance is first quantified in wind tunnel experiments and subsequently, three-dimensional computational fluid dynamics (CFD) simulations are performed to complement the experiments and to provide the fluid mechanical details. It is found that the deflector has a significant effect (power-increasing) on the power output of the two rotors, which is related to the rotational direction of the two rotors. With the addition of the deflector, the twin VAWT is able to harness up to 38.6% more wind energy compared with the system without deflector. The analysis of the CFD-produced flow field showed that the increased power output is the result of local acceleration of the fluid and local blockage effect of the deflector. The use of a deflector is found to be a simple and practical approach to improve the performance of twin VAWT system.

中文翻译：

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带导流板的双垂直轴风力涡轮机的实验和数值研究

摘要 在本文中，我们报告了一种新型垂直轴风力涡轮机 (VAWT) 系统的设计和测试。该系统由两个反向旋转的 VAWT 转子和放置在两个转子之间的偏转器组成。该系统的性能首先在风洞实验中量化，随后进行三维计算流体动力学 (CFD) 模拟以补充实验并提供流体力学细节。发现导流板对两个旋翼的功率输出有显着影响（增力），这与两个旋翼的旋转方向有关。通过添加导流板，与没有导流板的系统相比，双 VAWT 能够多利用多达 38.6% 的风能。对 CFD 产生的流场的分析表明，增加的功率输出是流体局部加速和偏转器局部堵塞作用的结果。发现使用偏转器是提高双 VAWT 系统性能的一种简单实用的方法。