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Research Papers

Research on the Influence of Helical Strakes and Its Parameters on Dynamic Response of Platform of Floating Wind Turbine Based on Optimization Method of Orthogonal Design

[+] Author and Article Information
Qinwei Ding

School of Energy and Power Engineering,
University of Shanghai for
Science and Technology,
516 Jungong Road, Yangpu District,
Shanghai 200093, China
e-mail: m18301928952@163.com

Chun Li

School of Energy and Power Engineering,
University of Shanghai for
Science and Technology,
516 Jungong Road, Yangpu District,
Shanghai 200093, China
e-mails: lichunusst@163.com;
david_usst@163.com

Binxin Li

Asia Capital Reinsurance,
#08-01 Suntec Tower 4,
Singapore 429081, Singapore
e-mails: rachellbx@gmail.com;
rachel.li@chaucerplc.com

Wenxing Hao

School of Energy and Power Engineering,
University of Shanghai for
Science and Technology,
516 Jungong Road, Yangpu District,
Shanghai 200093, China
e-mail: hao_wtar@163.com

Zhou Ye

School of Energy and Power Engineering,
University of Shanghai for
Science and Technology,
516 Jungong Road, Yangpu District,
Shanghai 200093, China
e-mail: ye_pei_yu@163.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received January 5, 2016; final manuscript received May 26, 2017; published online July 18, 2017. Assoc. Editor: Douglas Cairns.

J. Sol. Energy Eng 139(5), 051002 (Jul 18, 2017) (9 pages) Paper No: SOL-16-1003; doi: 10.1115/1.4037091 History: Received January 05, 2016; Revised May 26, 2017

The stability of platform is the most fundamental guarantee for the safe operation of floating wind turbine in complex marine environment. The helical strakes used on spar platform in the traditional oil industry are useful and effective. This paper is to investigative the validity of helical strakes when used for offshore wind energy harvesting. The National Renewable Energy Laboratory (NREL) 5 MW wind turbine based on OC3-Hywind spar-buoy platform with the attachment of helical strakes is modeled for the purpose to analysis the impact of helical strakes and its design parameters (number, height, and pitch ratio) on the dynamic response of the floating wind turbine spar platform. The dynamic response of spar platform under wind, wave, and current loads is calculated and analyzed based on the radiation and diffraction theory, the finite element method, and the orthogonal design method. The research result shows that the helical strakes can effectively suppress the dynamic response of the platform but enlarge the wave exciting force, and helical strakes cannot change peak frequency of response amplitude operator (RAO) and wave exciting force of spar in frequency-domain. The best parameter combination is two pieces of helical strakes with height of 15%D and the pitch ratio of 5. Height and pitch ratio of the helical strakes have significant influence on pitch response, while the number and interaction of height and pitch ratio have slight effect.

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Figures

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Fig. 4

Effect of wave on floating structure

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Fig. 3

Rotor thrust force versus wind speed

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Fig. 2

Platform attached with helical strakes

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Fig. 1

Whole model of floating wind turbine system

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Fig. 5

Model of the mooring line

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Fig. 6

Motion of spar in 6 deg

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Fig. 10

RAO and wave exciting force in frequency-domain: (a) surge, (b) heave, and (c) pitch

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Fig. 7

Flow chart of simulation procedure

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Fig. 8

Calculation region and grid distribution

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Fig. 9

Grid on the surface of spar

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Fig. 11

Relationship between pitch RAO and the parameter level

Tables

Errata

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