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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...

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Published: Swansea University, Wales, UK 2024
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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first_indexed 2024-06-14T15:19:03Z
last_indexed 2024-06-14T15:19:03Z
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spelling v2 66734 2024-06-14 Transient BEMT models and validation through a sea trial turbine platform e8f8456d00aa16a4c19bfcdb01573290 IESTYN EVANS IESTYN EVANS true false 2024-06-14 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. E-Thesis Swansea University, Wales, UK Tidal energy, Tidal stream turbine, BEMT numerical modelling, Field testing 9 5 2024 2024-05-09 10.23889/SUthesis.66734 A selection of content is redacted or is partially redacted from this thesis to protect sensitive and personal information. COLLEGE NANME COLLEGE CODE Swansea University Masters, I., and Togneri, M. Doctoral Ph.D MEECE project funded by the European Regional Development Fund and the Welsh & UK governments through the Swansea Bay City Deal MEECE project funded by the European Regional Development Fund and the Welsh & UK governments through the Swansea Bay City Deal 2024-06-14T16:32:20.8867932 2024-06-14T15:38:02.9731676 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering IESTYN EVANS 1 66734__30654__428364295b034718ba88731a81c45f2b.pdf 2024_Evans_I.final.66734.pdf 2024-06-14T16:10:16.4745363 Output 22832673 application/pdf E-Thesis – open access true Copyright: The Author, Iestyn Evans, 2024 true eng
title Transient BEMT models and validation through a sea trial turbine platform
spellingShingle Transient BEMT models and validation through a sea trial turbine platform
IESTYN EVANS
title_short Transient BEMT models and validation through a sea trial turbine platform
title_full Transient BEMT models and validation through a sea trial turbine platform
title_fullStr Transient BEMT models and validation through a sea trial turbine platform
title_full_unstemmed Transient BEMT models and validation through a sea trial turbine platform
title_sort Transient BEMT models and validation through a sea trial turbine platform
author_id_str_mv e8f8456d00aa16a4c19bfcdb01573290
author_id_fullname_str_mv e8f8456d00aa16a4c19bfcdb01573290_***_IESTYN EVANS
author IESTYN EVANS
author2 IESTYN EVANS
format E-Thesis
publishDate 2024
institution Swansea University
doi_str_mv 10.23889/SUthesis.66734
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Mechanical Engineering
document_store_str 1
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description 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.
published_date 2024-05-09T16:32:19Z
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score 11.035874

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