Experimental study of the effects of turbine solidity, blade profile, pitch angle, surface roughness and aspect ratio on the H-Darrieus wind turbine self-starting and overall performance

Du, Longhuan; Ingram, Grant; Dominy, Robert

Abstract

New and comprehensive time‐accurate, experimental data from an H‐Darrieus wind turbine are presented to further develop our understanding of the performance of these turbines with a particular focus on self‐starting. The impact of turbine solid-ity, blade profile, surface roughness, pitch angle, and aspect ratio on the turbine's performance is investigated, parameters that are thought to be critical for small‐scale VAWT operation, particularly when operating in the built environment. It is demon-strated clearly that high turbine solidity (???? ≥ 0.81) is beneficial for turbine self‐start-ing and that the selection of a thick, symmetrical aerofoil set at a low, negative pitch angle (???? ≥−2◦) is better than a cambered foil. Increased blade surface roughness is also shown to improve a turbine's self‐starting capability at low tip speed ratios and with high turbine solidity and the associated flow physics are discussed. Finally, it was confirmed that blade span has a significant impact on turbine starting. This paper contributes to the understanding of the turbine characteristics during the start-ing period and provides clear guidance and validation cases for future design and research in order to promote and justify the wider application of this wind turbine configuration.

Citation

Du, L., Ingram, G., & Dominy, R. (2019). Experimental study of the effects of turbine solidity, blade profile, pitch angle, surface roughness and aspect ratio on the H-Darrieus wind turbine self-starting and overall performance. Energy Science and Engineering, 7(6), 2421-2436. https://doi.org/10.1002/ese3.430

• Journal Article Type: Article
• Acceptance Date: Jul 26, 2019
• Online Publication Date: Aug 14, 2019
• Publication Date: Dec 31, 2019
• Deposit Date: Aug 7, 2019
• Publicly Available Date: Aug 14, 2019
• Journal: Energy Science and Engineering
• Publisher: Wiley Open Access
• Peer Reviewed: Peer Reviewed
• Volume: 7
• Issue: 6
• Pages: 2421-2436
• DOI: https://doi.org/10.1002/ese3.430