A Coupled Blade Element Momentum – Computational Fluid Dynamics Model for Evaluating Floating Wind Turbine Motion under Linear Waves
Date Issued
2014
Date
2014
Author(s)
Lee, Chung-Kai
Abstract
The offshore wind turbine will be influenced by the couple of aerodynamics and hydrodynamics.The selection of floating platform will directly affect the generating power of the wind turbine. The floating system of the OC3-Hywind and the OC4 DeepCwind is applied in this paper. Through the Blade Element Momentum theory evaluate the power curve of NREL-5MW wind turbine and compare to the NREL data. It shows two of them have similar power curve, but they have about 7.64% difference in the rating velocity condition. When we consider the real wind turbine control system in the pitch motion, the average power is no longer that high anymore. Within the motion of turbine, it causes the power of turbine have the same period as the motion of turbine.
In this paper, coupling the Blade Element Momentum (BEM) and computational Fluid Dynamics model (CFD) to evaluate two type of floating wind turbine, spar and semisubmersible wind turbine. Under the wave height 4m and period 10s, it shows that the semisubmersible type floating wind turbine has lower power loss than the spar type of wind turbine. This simulation case is verified with the reference.
According to this research present a suitable wave condition to reduce the power loss for both of the floating wind turbine. If the wave period is less than 8.4s, so the spar type floating wind turbine has been recommended. But if the wave period is larger than 10 s and the wave is just like calm sea state, the semisubmersible floating wind turbine will be better.
Subjects
葉片元素動量理論
計算流體力學
離岸浮體式風機
Spar型浮體平台
半潛型浮體平台
Type
thesis
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