Abstract
AbstractNew 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 solidity, 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 demonstrated clearly that high turbine solidity is beneficial for turbine self‐starting and that the selection of a thick, symmetrical aerofoil set at a low, negative pitch angle () 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 starting 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.
Highlights
Small wind turbines are considered to be one of the most promising sources of clean electricity generation, in the built environment
Improvements in the understanding and prediction of vertical axis wind turbines (VAWTs) performance have been achieved through the use of analytical models, CFD simulations, and through a small number of experimental measurements which have recently begun to use time‐accurate techniques such as particle image velocimetry (PIV)
Investigate the influence of design features including turbine solidity, blade profile, blade surface roughness, pitch angle, and aspect ratio on turbine performance especially at low tip speed ratios in order to fill a gap of the understanding of the turbine starting behavior
Summary
Small wind turbines are considered to be one of the most promising sources of clean electricity generation, in the built environment. Investigate the influence of design features including turbine solidity, blade profile, blade surface roughness, pitch angle, and aspect ratio on turbine performance especially at low tip speed ratios in order to fill a gap of the understanding of the turbine starting behavior. It is noted that Rezaeiha et al[18] recently proposed that Cp was proportional to a new parameter “ 3,” which enables the maximum Cp to be almost independent of turbine geometrical and operational characteristics Their conclusions were drawn from a CFD study of just a single blade profile at one pitch angle so further analysis based on a much broader range of test conditions needs to be performed before that parameter can be used with confidence.
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