A robust biomimetic blade design for micro wind turbines

Teruaki Ikeda, Hiroto Tanaka, Ryosuke Yoshimura, Ryusuke Noda, Takeo Fujii and Hao Liu

Renewable Energy, 2018, vol. 125, issue C, 155-165

Abstract: Inspired by bird wings that enable robust aerodynamic force production and stable flight, we propose a biomimetic blade design for small wind turbines that is capable of achieving a high integral power coefficient, Cp, over a broad range of tip-speed ratios, λ, and hence enhances robustness in aerodynamic performance. We first developed a basic blade design with bird-inspired flexed wing morphology and investigated its aerodynamic characteristics with computational fluid dynamics. Our results demonstrated that the swept-forward shaped portion proximal to wing root augmented Cp at smaller λ, whereas the distal swept-backward shaped portion improved Cp at larger λ. We further conducted a morphology optimization and developed an optimized flexion blade that is capable of achieving a remarkably improved Cp over a broad range of λ. To evaluate the aerodynamic robustness under variable tip-speed ratios in an integral way, we here propose a new Robustness Index (Ri) and find that the optimized-flexion blade outperforms a conventional blade based on Blade Element Momentum Theory by 8.1%, indicating marked robustness in power output. Our results indicate that of great potential for wind turbines robustness-oriented biomimetic blade design can be a practical and effective methodology in wind-based sustainable energy harvesting.

Keywords: Small wind turbine; Biomimetic blade design; Aerodynamic robustness; Computational fluid dynamics; Blade shape optimization (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:125:y:2018:i:c:p:155-165

DOI: 10.1016/j.renene.2018.02.093

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