Design of a horizontal axis tidal turbine for less energetic current velocity profiles
Encarnacion, Job Immanuel and Johnstone, Cameron and Ordonez-Sanchez, Stephanie (2019) Design of a horizontal axis tidal turbine for less energetic current velocity profiles. Journal of Marine Science and Engineering, 7 (7). 197. ISSN 2077-1312 (https://doi.org/10.3390/jmse7070197)
Preview |
Text.
Filename: Encarnacion_etal_JMSE_2019_Design_of_a_horizontal_axis_tidal_turbine_for_less_energetic_current_velocity_profiles.pdf
Final Published Version License: Download (1MB)| Preview |
Abstract
Existing installations of tidal-stream turbines are undertaken in energetic sites with flow speeds greater than 2 m/s. Sites with lower velocities will produce far less power and may not be as economically viable when using “conventional” tidal turbine designs. However, designing turbines for these less energetic conditions may improve the global viability of tidal technology. Lower hydrodynamic loads are expected, allowing for cost reduction through downsizing and using cheaper materials. This work presents a design methodology for low-solidity high tip-speed ratio turbines aimed to operate at less energetic flows with velocities less than 1.5 m/s. Turbines operating under representative real-site conditions in Mexico and the Philippines are evaluated using a quasi-unsteady blade element momentum method. Blade geometry alterations are undertaken using a scaling factor applied to chord and twist distributions. A parametric filtering and multi-objective decision model is used to select the optimum design among the generated blade variations. It was found that the low-solidity high tip-speed ratio blades lead to a slight power drop of less than 8.5% when compared to the “conventional” blade geometries. Nonetheless, an increase in rotational speed, reaching a tip-speed ratio (TSR) of 7.75, combined with huge reduction in the torque requirement of as much as 30% paves the way for reduced costs from generator downsizing and simplified power take-off mechanisms
-
-
Item type: Article ID code: 68780 Dates: DateEvent27 June 2019Published20 June 2019AcceptedSubjects: Technology > Mechanical engineering and machinery
Technology > Hydraulic engineering. Ocean engineeringDepartment: Faculty of Engineering > Mechanical and Aerospace Engineering Depositing user: Pure Administrator Date deposited: 09 Jul 2019 11:14 Last modified: 06 Aug 2024 01:25 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/68780