Aerodynamic performance and starting torque enhancement of small-scale Darrieus type straight-bladed vertical axis wind turbines with J-shaped airfoil

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-05-01 DOI:10.1063/5.0203557

Kabita Naik, Niranjan Sahoo

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Abstract

Wind energy is one of the most eminent renewable sources for the generation of power. The increasing enthusiasm toward the advancement of small-scale Darrieus type straight-bladed vertical axis wind turbines (SB-VAWTs) can offer a potential remedy for addressing power shortage and the unpredictability of climate conditions. These particular wind turbines provide distinct advantages over their counterparts due to their linear blade design and uncomplicated structure. However, enhancements are required in their aerodynamic efficiency and self-initiation capabilities. These challenges stem from using traditional straight blade configurations and symmetrical airfoils. By substituting these conventional elements with J-shaped straight blades and along with cambered airfoils, these issues can be effectively overcome. The current study aims to investigate the effect of J-shaped straight blades with a series of cambered airfoils to improve the aerodynamic performance and starting torque of small-scale Darrieus type SB-VAWTs. Therefore, experimental and numerical studies are conducted to analyze the J-shaped airfoil impact with various opening ratios systematically. The J-shaped blade profile is designed by eliminating some portion toward the trailing edge of a conventional airfoil. This analysis demonstrated that the J-shaped blade incorporating a cambered NACA 4418 airfoil outperforms its alternative cambered airfoil designs. The performance of SB-VAWT improves by about 25% by the J-shape of the cambered NACA 4418 airfoil with a 70% opening ratio. Moreover, the use of J-shaped airfoils enhances the self-starting torque of SB-VAWT compared to conventional airfoils.

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采用 J 型翼面的小型达里厄斯直叶垂直轴风力发电机的空气动力性能和启动扭矩改进

风能是最重要的可再生能源之一。人们对小型达里厄斯型直叶垂直轴风力涡轮机（SB-VAWT）的热情日益高涨，这为解决电力短缺和气候条件的不可预测性提供了一种潜在的补救措施。这些特殊的风力涡轮机因其线性叶片设计和简单的结构，与同类产品相比具有明显的优势。然而，它们的空气动力效率和自启动能力仍有待提高。这些挑战源于使用传统的直叶片配置和对称翼面。用 J 形直叶片和外凸机翼取代这些传统元件，可以有效地克服这些问题。本研究旨在探讨 J 形直叶片与一系列外倾机翼对改善小型达里厄斯型 SB-VAWT 的气动性能和启动扭矩的影响。因此，我们进行了实验和数值研究，系统分析了不同开口率的 J 形翼面冲击。J 形叶片轮廓是通过去掉传统机翼后缘的部分而设计的。分析表明，结合了外凸 NACA 4418 翼面的 J 形叶片优于其他外凸翼面设计。由于采用了开口率为 70% 的 J 型凸面 NACA 4418 机翼，SB-VAWT 的性能提高了约 25%。此外，与传统机翼相比，使用 J 形机翼可提高 SB-VAWT 的自启动扭矩。

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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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.