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Experimental and simulation investigation into the effects of a flat plate deflector on vertical axis wind turbine

机译：平板导流板对垂直轴风力发电机影响的实验和仿真研究

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摘要

Power augmentation features have been proven as one of the wind turbine performance enhancement methods particularly for vertical axis wind turbines (VAWTs). Researches showed that with the aid of a deflector, shroud or a single plate, the power output of a VAWT can be increased remarkably. In this paper, lab tests and simulations were performed to investigate the aerodynamic effects and the flow field around a flat plate deflector as a power augmentation device which is placed at the lower upstream of a micro H-rotor VAWT. From the study, the deflector is able to induce a high velocity wind at the near-wake region which was about 25% higher compared to the oncoming wind velocity. The deflected wind flows improve the performance significantly as well as reduce the self-start velocity of the turbine. Nonetheless, it is highly dependent on the positioning of the flat plate deflector. Both experiment and simulation showed a notable observation on the position effect of the flat plate deflector. From the lab test, with the deflector at the optimal position, the maximum coefficient of power (C-p) achieved was 7.4% increment compared to the bare turbine. Also, from the simulation, the optimal position showed an improvement of averaged C-p up to 33% compared to the bare turbine. The flat plate deflector is simple, low cost, and can be easily retrofitted to existing stand-alone VAWT systems to improve the efficiency making them suitable for on-site power generation in urban and isolated places.
机译：功率增强特征已经被证明是风力涡轮机性能增强方法之一，特别是对于垂直轴风力涡轮机（VAWT）。研究表明，借助导流板，护罩或单个板，VAWT的功率输出可以显着增加。在本文中，进行了实验室测试和模拟，以研究空气动力效应和平板导流板周围的流场，该导流板作为功率增强设备，位于微型H转子VAWT的下部上游。根据研究，导流板能够在近苏醒区域诱发高速风，该风速比即将来临的风速高约25％。偏转的气流显着改善了性能，并降低了涡轮机的自启动速度。但是，它在很大程度上取决于平板偏转器的位置。实验和仿真均显示了平板偏转器的位置效应的显着观察。从实验室测试来看，在导流板处于最佳位置的情况下，与裸机相比，获得的最大功率系数（C-p）增加了7.4％。此外，从仿真中可以看出，与裸机相比，最佳位置的平均C-p值提高了33％。平板导流板简单，成本低廉，并且可以轻松地改造为现有的独立VAWT系统，以提高效率，使其适合在城市和偏远地区进行现场发电。

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