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Dynamic performance modelling of tidal stream turbines in ocean waves. / James A. C Orme

Swansea University Author: James A. C Orme

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The primary aim of this work is to develop a tool to predict the lifetime performance of a tidal stream turbine. This involves the experimental validation of Blade Element Momentum Theory (BEMT) and implementation of an extended model to optimise blade design and predict performance over the operati...

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Published: 2006
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42663
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last_indexed 2018-08-03T10:10:44Z
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spelling 2018-08-02T16:24:30.0397959 v2 42663 2018-08-02 Dynamic performance modelling of tidal stream turbines in ocean waves. 0979158ab4ec2ca46be470ba89f90ac0 NULL James A. C Orme James A. C Orme true true 2018-08-02 The primary aim of this work is to develop a tool to predict the lifetime performance of a tidal stream turbine. This involves the experimental validation of Blade Element Momentum Theory (BEMT) and implementation of an extended model to optimise blade design and predict performance over the operating range. Time varying non-linear upstream flows, such as wave action and velocity gradients are considered and the model is extended into the time domain to obtain the dynamic response of the rotor. In addition, to rationalise the environmental conditions that a device will encounter in its lifetime, representative sea-states and occurrences must be defined. A 1m diameter turbine is tow tested in the River Tawe. It is monitored and controlled such that the performance can be analysed over the operating range. An automated electrical control system is also tested. The results are compared to BEMT. The BEMT is numerically implemented and examined to determine its limitations. Off-optimum performance is considered. The model is extended to incorporate a time dependent flow field with additional velocity and acceleration terms to allow the consideration of wave kinematics. Resultant forces are defined and calculated for particular environmental conditions. Finally the results are interpreted to allow the estimation of lifetime loadings including peak loads and fatigue. The model is validated and a good correlation is found relative to standard BEMT. It is concluded that both a velocity gradient and a wave action may significantly reduce power output whilst increasing the loads on a system. It is also concluded that a 3 bladed rotor encounters far lower loadings than a 2 bladed equivalent over the device lifetime. It is also the intention of this study to compare and contrast various tidal stream turbine support structure concepts in terms of the suitability of each to withstand the lifetime loadings at reasonable cost. A number of support structure concepts are investigated from an impartial perspective. In conclusion there is not one concept which clearly surpasses the others in all areas. E-Thesis Ocean engineering.;Environmental engineering.;Alternative Energy. 31 12 2006 2006-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:30.0397959 2018-08-02T16:24:30.0397959 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised James A. C Orme NULL 1 0042663-02082018162512.pdf 10807432.pdf 2018-08-02T16:25:12.1770000 Output 20453685 application/pdf E-Thesis true 2018-08-02T16:25:12.1770000 false
title Dynamic performance modelling of tidal stream turbines in ocean waves.
spellingShingle Dynamic performance modelling of tidal stream turbines in ocean waves.
James A. C Orme
title_short Dynamic performance modelling of tidal stream turbines in ocean waves.
title_full Dynamic performance modelling of tidal stream turbines in ocean waves.
title_fullStr Dynamic performance modelling of tidal stream turbines in ocean waves.
title_full_unstemmed Dynamic performance modelling of tidal stream turbines in ocean waves.
title_sort Dynamic performance modelling of tidal stream turbines in ocean waves.
author_id_str_mv 0979158ab4ec2ca46be470ba89f90ac0
author_id_fullname_str_mv 0979158ab4ec2ca46be470ba89f90ac0_***_James A. C Orme
author James A. C Orme
author2 James A. C Orme
format E-Thesis
publishDate 2006
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 The primary aim of this work is to develop a tool to predict the lifetime performance of a tidal stream turbine. This involves the experimental validation of Blade Element Momentum Theory (BEMT) and implementation of an extended model to optimise blade design and predict performance over the operating range. Time varying non-linear upstream flows, such as wave action and velocity gradients are considered and the model is extended into the time domain to obtain the dynamic response of the rotor. In addition, to rationalise the environmental conditions that a device will encounter in its lifetime, representative sea-states and occurrences must be defined. A 1m diameter turbine is tow tested in the River Tawe. It is monitored and controlled such that the performance can be analysed over the operating range. An automated electrical control system is also tested. The results are compared to BEMT. The BEMT is numerically implemented and examined to determine its limitations. Off-optimum performance is considered. The model is extended to incorporate a time dependent flow field with additional velocity and acceleration terms to allow the consideration of wave kinematics. Resultant forces are defined and calculated for particular environmental conditions. Finally the results are interpreted to allow the estimation of lifetime loadings including peak loads and fatigue. The model is validated and a good correlation is found relative to standard BEMT. It is concluded that both a velocity gradient and a wave action may significantly reduce power output whilst increasing the loads on a system. It is also concluded that a 3 bladed rotor encounters far lower loadings than a 2 bladed equivalent over the device lifetime. It is also the intention of this study to compare and contrast various tidal stream turbine support structure concepts in terms of the suitability of each to withstand the lifetime loadings at reasonable cost. A number of support structure concepts are investigated from an impartial perspective. In conclusion there is not one concept which clearly surpasses the others in all areas.
published_date 2006-12-31T03:53:24Z
_version_ 1763752651965595648
score 11.01438

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