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Title: A numerical investigation into torque ripple and power in vertical axis tidal turbines
Author: Winchester, Jonathan Douglas Logie
Awarding Body: Lancaster University
Current Institution: Lancaster University
Date of Award: 2011
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This study uses a blade element momentum model, the double multiple stream-tube method, to investigate vertical axis turbines for tidal stream applications. Numerous combinations of input parameters are investigated, for both fixed pitch and variable pitch turbines, and the results are analysed both with respect to the coefficient of performance and with respect to the torque ripple suffered by the turbine. Optimal operating conditions are determined for fixed pitch turbines, and potential benefits of varying the pitch are discovered. The results are calculated using lift and drag data generated by a choice of potential flow solver, which are also analysed to determine their accuracy with respect to a static blade and their influence upon the double multiple stream-tube outputs. The code is verified to ensure that it is internally consistent.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available