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E-Thesis 16754 views 255 downloads

Combined current, wave and turbulent flows and their effects on tidal energy devices. / Hannah Buckland

Swansea University Author: Hannah Buckland

Abstract

This thesis considers the effect of disruptive waves and turbulence on a horizontal axis tidal stream turbine (TST), in terms of performance and survivability. The TST reaction to transient fluid flow is modelled analytically using Blade Element Momentum Theory (BEMT). Standard BEMT corrections are...

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Published: 2014
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42509
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first_indexed 2018-08-02T18:54:52Z
last_indexed 2018-08-03T10:10:20Z
id cronfa42509
recordtype RisThesis
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spelling 2018-08-02T16:24:29.4937951 v2 42509 2018-08-02 Combined current, wave and turbulent flows and their effects on tidal energy devices. 837db9d4bd0c8a17cda4cc065003f61e NULL Hannah Buckland Hannah Buckland true true 2018-08-02 This thesis considers the effect of disruptive waves and turbulence on a horizontal axis tidal stream turbine (TST), in terms of performance and survivability. The TST reaction to transient fluid flow is modelled analytically using Blade Element Momentum Theory (BEMT). Standard BEMT corrections are evaluated for the TST application and an alternative optimisation method is proposed for the steady state BEMT, improving compatibility with transient and depth dependent inflow, as well as the non-dimensionalisation constant needed to calculate the performance coefficients. Also, an alternative BEMT tip and hub loss implementation has led to a significant improvement of the turbine axial force prediction and in the high induction region. Validation studies are presented for BEMT coupled with regular, nonlinear wave theory and good agreement is found with published experimental data. A novel method to simulate irregular sea states is developed to couple with BEMT and a combined reactive coupling of waves and current is implemented. The TST performance in an irregular sea state is considered against turbine performance with real ADCP data and a good agreement is found. This work evaluates the BEMT implementation for the specific application of modelling TST's and significantly improves the fundamental theory, applicability and quality of results in this case. E-Thesis Ocean engineering. 31 12 2014 2014-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.4937951 2018-08-02T16:24:29.4937951 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Hannah Buckland NULL 1 0042509-02082018162500.pdf 10801739.pdf 2018-08-02T16:25:00.1000000 Output 18702756 application/pdf E-Thesis true 2018-08-02T16:25:00.1000000 false
title Combined current, wave and turbulent flows and their effects on tidal energy devices.
spellingShingle Combined current, wave and turbulent flows and their effects on tidal energy devices.
Hannah Buckland
title_short Combined current, wave and turbulent flows and their effects on tidal energy devices.
title_full Combined current, wave and turbulent flows and their effects on tidal energy devices.
title_fullStr Combined current, wave and turbulent flows and their effects on tidal energy devices.
title_full_unstemmed Combined current, wave and turbulent flows and their effects on tidal energy devices.
title_sort Combined current, wave and turbulent flows and their effects on tidal energy devices.
author_id_str_mv 837db9d4bd0c8a17cda4cc065003f61e
author_id_fullname_str_mv 837db9d4bd0c8a17cda4cc065003f61e_***_Hannah Buckland
author Hannah Buckland
author2 Hannah Buckland
format E-Thesis
publishDate 2014
institution Swansea University
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 Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description This thesis considers the effect of disruptive waves and turbulence on a horizontal axis tidal stream turbine (TST), in terms of performance and survivability. The TST reaction to transient fluid flow is modelled analytically using Blade Element Momentum Theory (BEMT). Standard BEMT corrections are evaluated for the TST application and an alternative optimisation method is proposed for the steady state BEMT, improving compatibility with transient and depth dependent inflow, as well as the non-dimensionalisation constant needed to calculate the performance coefficients. Also, an alternative BEMT tip and hub loss implementation has led to a significant improvement of the turbine axial force prediction and in the high induction region. Validation studies are presented for BEMT coupled with regular, nonlinear wave theory and good agreement is found with published experimental data. A novel method to simulate irregular sea states is developed to couple with BEMT and a combined reactive coupling of waves and current is implemented. The TST performance in an irregular sea state is considered against turbine performance with real ADCP data and a good agreement is found. This work evaluates the BEMT implementation for the specific application of modelling TST's and significantly improves the fundamental theory, applicability and quality of results in this case.
published_date 2014-12-31T03:53:06Z
_version_ 1763752633017827328
score 11.037319

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