Numerical models to predict the performance of tidal stream turbines working under off-design conditions

S. Ordonez-Sanchez, R. Ellis , K. E. Porter, M. Allmark, T. O'Doherty, A. Mason-Jones, C. Johnstone

Research output: Contribution to journalArticle

Abstract

As previously experienced by the wind industry, it is envisaged that tidal stream turbine blades will presentmisalignments or blade deformations over time as they are constantly working under harsh and highlyunsteady environments. Blade misalignment will affect the power capture of a tidal stream turbine andif not detected in time could affect other components of the drive train. Therefore, the aim of this paperis to compare the use of two numerical modelling techniques to predict the performance of a tidal streamturbine working under off-design conditions, in this case, the misalignment of one or more blades. Thetechniques used in this study are Blade Element Momentum Theory and Computational Fluid Dynamics.The numerical models simulate the performance of a three-bladed horizontal axis tidal stream turbine withone or two blades offset from the optimum pitch setting. The simulations were undertaken at 1.0 m/s flowspeeds. The results demonstrated that both unsteady BEMT and steady or transient CFD are able topredict power coefficients when there is a certain level of misalignment in one or even two blades. However,both techniques failed to accurately predict a loss of power performance at high rotational speeds.
LanguageEnglish
Number of pages18
JournalOcean Engineering
Publication statusAccepted/In press - 8 Apr 2019

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Turbomachine blades
Numerical models
Turbines
Computational fluid dynamics
Momentum
Industry

Keywords

  • blade element momentum theory
  • computational fluid dynamics
  • blade misalignment
  • off design
  • numberical modelling
  • tidal stream turbine

Cite this

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title = "Numerical models to predict the performance of tidal stream turbines working under off-design conditions",
abstract = "As previously experienced by the wind industry, it is envisaged that tidal stream turbine blades will presentmisalignments or blade deformations over time as they are constantly working under harsh and highlyunsteady environments. Blade misalignment will affect the power capture of a tidal stream turbine andif not detected in time could affect other components of the drive train. Therefore, the aim of this paperis to compare the use of two numerical modelling techniques to predict the performance of a tidal streamturbine working under off-design conditions, in this case, the misalignment of one or more blades. Thetechniques used in this study are Blade Element Momentum Theory and Computational Fluid Dynamics.The numerical models simulate the performance of a three-bladed horizontal axis tidal stream turbine withone or two blades offset from the optimum pitch setting. The simulations were undertaken at 1.0 m/s flowspeeds. The results demonstrated that both unsteady BEMT and steady or transient CFD are able topredict power coefficients when there is a certain level of misalignment in one or even two blades. However,both techniques failed to accurately predict a loss of power performance at high rotational speeds.",
keywords = "blade element momentum theory, computational fluid dynamics, blade misalignment, off design, numberical modelling, tidal stream turbine",
author = "S. Ordonez-Sanchez and R. Ellis and Porter, {K. E.} and M. Allmark and T. O'Doherty and A. Mason-Jones and C. Johnstone",
year = "2019",
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day = "8",
language = "English",
journal = "Ocean Engineering",
issn = "0029-8018",
publisher = "Elsevier",

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Numerical models to predict the performance of tidal stream turbines working under off-design conditions. / Ordonez-Sanchez, S.; Ellis , R.; Porter, K. E.; Allmark, M.; O'Doherty, T.; Mason-Jones, A.; Johnstone, C.

In: Ocean Engineering, 08.04.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Numerical models to predict the performance of tidal stream turbines working under off-design conditions

AU - Ordonez-Sanchez, S.

AU - Ellis , R.

AU - Porter, K. E.

AU - Allmark, M.

AU - O'Doherty, T.

AU - Mason-Jones, A.

AU - Johnstone, C.

PY - 2019/4/8

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N2 - As previously experienced by the wind industry, it is envisaged that tidal stream turbine blades will presentmisalignments or blade deformations over time as they are constantly working under harsh and highlyunsteady environments. Blade misalignment will affect the power capture of a tidal stream turbine andif not detected in time could affect other components of the drive train. Therefore, the aim of this paperis to compare the use of two numerical modelling techniques to predict the performance of a tidal streamturbine working under off-design conditions, in this case, the misalignment of one or more blades. Thetechniques used in this study are Blade Element Momentum Theory and Computational Fluid Dynamics.The numerical models simulate the performance of a three-bladed horizontal axis tidal stream turbine withone or two blades offset from the optimum pitch setting. The simulations were undertaken at 1.0 m/s flowspeeds. The results demonstrated that both unsteady BEMT and steady or transient CFD are able topredict power coefficients when there is a certain level of misalignment in one or even two blades. However,both techniques failed to accurately predict a loss of power performance at high rotational speeds.

AB - As previously experienced by the wind industry, it is envisaged that tidal stream turbine blades will presentmisalignments or blade deformations over time as they are constantly working under harsh and highlyunsteady environments. Blade misalignment will affect the power capture of a tidal stream turbine andif not detected in time could affect other components of the drive train. Therefore, the aim of this paperis to compare the use of two numerical modelling techniques to predict the performance of a tidal streamturbine working under off-design conditions, in this case, the misalignment of one or more blades. Thetechniques used in this study are Blade Element Momentum Theory and Computational Fluid Dynamics.The numerical models simulate the performance of a three-bladed horizontal axis tidal stream turbine withone or two blades offset from the optimum pitch setting. The simulations were undertaken at 1.0 m/s flowspeeds. The results demonstrated that both unsteady BEMT and steady or transient CFD are able topredict power coefficients when there is a certain level of misalignment in one or even two blades. However,both techniques failed to accurately predict a loss of power performance at high rotational speeds.

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KW - numberical modelling

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