E-Thesis 256 views 97 downloads
Transient BEMT models and validation through a sea trial turbine platform / IESTYN EVANS
Swansea University Author: IESTYN EVANS
DOI (Published version): 10.23889/SUthesis.66734
Abstract
Tidal stream turbines (TSTs) have the potential to contribute significantly to the UK energy needs. Currently, the sector is still in a primitive stage and has a relatively high levelised cost of energy compared to other renewable energy sources. A reduction in their cost can be made by improving th...
| Published: |
Swansea University, Wales, UK
2024
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| Institution: | Swansea University |
| Degree level: | Doctoral |
| Degree name: | Ph.D |
| Supervisor: | Masters, I., and Togneri, M. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa66734 |
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| Abstract: |
Tidal stream turbines (TSTs) have the potential to contribute significantly to the UK energy needs. Currently, the sector is still in a primitive stage and has a relatively high levelised cost of energy compared to other renewable energy sources. A reduction in their cost can be made by improving their design through numerical modelling and physical testing. This thesis will firstly present the classical blade element momentum theory (BEMT) numerical model which is enhanced with additional features (1. foil shape and Reynolds number dependence, and 2. transient turbulence and wave flow fields), which are incorporated to improve the predictions of loads and performance of TSTs. The improvements to the BEMT numerical model are quantified and validated by comparingto empirical data from laboratory testing of five different TSTs (Magallanes ATIR, Sabella D12, IFREMER, Oxford, and Barltrop). This inclusion of the foil shape and Reynolds number dependence in the numerical model has improved the prediction of rotor loads by up to 20%, whilst the inclusion of transient turbulence and wave flow fields has allowed for simulation of TSTs in flow conditions that were not previously possible. Secondly, the thesis presents the design and testing of a 3.0m diameter TST, named remote river energy system (RRES). The BEMT numerical model was used to predict the loads on the turbine which governed its design. A laboratory test rig was built to test the power take-off and pump assemblies prior to deployment at Warrior Way, Pembrokeshire. Valuable knowledge was gained throughout the design and testing stages of the RRES which will improve future developments of TSTs. The improvements made to the BEMT numerical model and testing of the RRES will help lower the levelised cost of energy and increase the attractiveness of TSTs as generators of clean renewable energy. |
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| Item Description: |
A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. |
| Keywords: |
Tidal energy, Tidal stream turbine, BEMT numerical modelling, Field testing |
| College: |
Faculty of Science and Engineering |
| Funders: |
MEECE project funded by the European Regional Development Fund and the Welsh & UK governments through the Swansea Bay City Deal |