Added-mass effects on a horizontal-axis tidal turbine using FAST v8

Murray, Robynne E.; Thresher, Robert; Jonkman, Jason

doi:10.1016/j.renene.2018.04.023

Title: Added-mass effects on a horizontal-axis tidal turbine using FAST v8

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Abstract

Added mass on tidal turbine blades has the potential to alter the blade dynamic response, such as natural frequencies and vibration amplitudes, as a response to blade acceleration. Currently, most aeroelastic design tools do not consider such effects as they are complex and expensive to model, and they are not an intrinsic part of most blade-element momentum theory codes, which are commonly used in the tidal energy industry. This article outlines the addition of added-mass effects to the National Renewable Energy Laboratory's design tool FAST v8. A verification is presented for a spring-mass system with an initial displacement, and a case study is performed for the Reference Model 1 20-m-diameter tidal turbine. For the 20-m-diameter turbine, it was shown that the natural frequency of vibration is reduced by 65% when added mass is considered. Further, the thrust loads are increased by 2.5% when the blades are excited by a 5% step increase in inflow velocity when added mass is considered. This decrease can have a significant impact on the overall turbine design, as it is important to design the blades with a natural frequency so that they are not excited by the rotor speed and its harmonics, wherein aerodynamic excitationmore »« less

Authors:

Murray, Robynne E. ^[1]; Thresher, Robert ^[1]; Jonkman, Jason ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)

Publication Date:: Mon Apr 09 00:00:00 EDT 2018

Research Org.:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:: 1433601

Alternate Identifier(s):: OSTI ID: 1496366

Report Number(s):: NREL/JA-5000-70185
Journal ID: ISSN 0960-1481

Grant/Contract Number:: AC36-08GO28308

Resource Type:: Accepted Manuscript

Journal Name:: Renewable Energy

Additional Journal Information:: Journal Volume: 126; Journal Issue: C; Journal ID: ISSN 0960-1481

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 13 HYDRO ENERGY; marine and hydrokinetic turbine; natural frequency; added mass; turbulence; design tool; FAST

Citation Formats


                    Murray, Robynne E., Thresher, Robert, and Jonkman, Jason. Added-mass effects on a horizontal-axis tidal turbine using FAST v8.  United States: N. p., 2018. 
Web.  doi:10.1016/j.renene.2018.04.023.

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                    Murray, Robynne E., Thresher, Robert, & Jonkman, Jason. Added-mass effects on a horizontal-axis tidal turbine using FAST v8.  United States.  https://doi.org/10.1016/j.renene.2018.04.023

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                    Murray, Robynne E., Thresher, Robert, and Jonkman, Jason. Mon .  
"Added-mass effects on a horizontal-axis tidal turbine using FAST v8".  United States.  https://doi.org/10.1016/j.renene.2018.04.023.  https://www.osti.gov/servlets/purl/1433601.

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@article{osti_1433601,

  title        = {Added-mass effects on a horizontal-axis tidal turbine using FAST v8},

  author       = {Murray, Robynne E. and Thresher, Robert and Jonkman, Jason},

  abstractNote = {Added mass on tidal turbine blades has the potential to alter the blade dynamic response, such as natural frequencies and vibration amplitudes, as a response to blade acceleration. Currently, most aeroelastic design tools do not consider such effects as they are complex and expensive to model, and they are not an intrinsic part of most blade-element momentum theory codes, which are commonly used in the tidal energy industry. This article outlines the addition of added-mass effects to the National Renewable Energy Laboratory's design tool FAST v8. A verification is presented for a spring-mass system with an initial displacement, and a case study is performed for the Reference Model 1 20-m-diameter tidal turbine. For the 20-m-diameter turbine, it was shown that the natural frequency of vibration is reduced by 65% when added mass is considered. Further, the thrust loads are increased by 2.5% when the blades are excited by a 5% step increase in inflow velocity when added mass is considered. This decrease can have a significant impact on the overall turbine design, as it is important to design the blades with a natural frequency so that they are not excited by the rotor speed and its harmonics, wherein aerodynamic excitation can lead to fatigue damage. However, it was shown that when turbulent inflow with an intensity of 20% was modeled, there was almost no impact on the loads and blade displacement with added-mass effects except for a small difference in the fatigue response of the blade to turbulent load fluctuations.},

  doi          = {10.1016/j.renene.2018.04.023},

  journal      = {Renewable Energy},

  number       = C,

  volume       = 126,

  place        = {United States},

  year         = {Mon Apr 09 00:00:00 EDT 2018},

  month        = {Mon Apr 09 00:00:00 EDT 2018}

}

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