A novel conceptual design of a dynamically positioned floating wind turbine

Xu, Shengwen; Murai, Motohiko; Wang, Xuefeng; Takahashi, Kensaku

doi:10.1016/j.oceaneng.2020.108528

Cited by 27 publications

(31 citation statements)

References 16 publications

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“…As reported in the Introduction, the demand for distributed renewable energy production from wind sources can also be met with the help of small-scale turbines installed over high buildings, and VAWTs are the best choice for wind energy exploitation in urban environment [1][2][3][4][5]. For wind energy potential assessment, numerical and laboratory simulations of urban boundary layer turbulence require a detailed description of geometric characteristics of the urban canopy in form of UCPs [16,17].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, renewable energies are becoming one of the most important research fields of our age. Among renewable energy sources, wind is currently playing a key role [1,2] since the wind turbines have proven their effectiveness, their efficiency is continuously increasing, and related technology is under constant enhancement [3][4][5][6][7], even looking to urban areas applications [8][9][10]. In the last years, the size of the wind turbines is continuously increasing because of the beneficial scale effects.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Automatic Method for the Urban Canyon Parametrization Needed by Turbulence Numerical Simulations for Wind Energy Potential Assessment

et al. 2021

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The energy transition to more sustainable forms is currently ongoing worldwide, because of the environmental impacts produced by the non-renewable energy sources employed in the last decades. Among the main alternatives, wind plays a key role and, nowadays, innovative instruments, such as small-scale turbines allow for installation of wind turbines in urban areas. Their energy potential assessment requires high-accuracy simulations of the turbulent flows in the urban canopy layer, which, in turn, require detailed information about the geometrical properties of the basic element to classify urban surfaces, i.e., the urban canyon, often not available. In this work, we propose a novel automatic method, based on Voronoi graph, to univocally identify urban canyons and to extract their geometrical parameters from online available GIS (Geographic Information System) data, and test it on four European cities that differ in size, story and location. Results show the capability of the method to identify the single urban canyon and to properly extract its geometrical parameters, which tend to assume similar values for the largest cities. Moreover, we first attempt to propose and test some curves to generally describe the data probability distribution, which may be useful for turbulence simulations for urban wind energy assessment and planning. The best results are found for the canyon aspect ratio.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Automatic Method for the Urban Canyon Parametrization Needed by Turbulence Numerical Simulations for Wind Energy Potential Assessment

et al. 2021

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“…Moreover, the sensors feed the measured environmental information to a dynamic positioning system (DPS), which then controls propulsion systems such as propellers to generate forces that oppose the environmental forces. However, the DPS as an active control method is a very complex system [10].…”

Section: Reducing the Wave Exciting Force Or Momentmentioning

confidence: 99%

Engineering Possibility Studies of a Novel Cylinder-Type FOWT Using Torus Structure with Annular Flow

Liu

Murai

2022

Energies

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This paper proposes and researches a novel cylinder-type FOWT using a neutrally buoyant double-layer torus structure with annular flow; its oscillatory motion in severe sea conditions is controlled by a spinning top device designed as a neutrally buoyant double-layer torus structure with annular flow water in a torus structure with a small internal radius, and welded to the periphery of the cylinder-type FOWT underwater buoyancy-providing part. The rotational axis retention effect and the gyroscopic effect are considered appropriate approaches to suppress the oscillating motion of FOWT. To obtain a better hydrodynamic response, the scale of the torus structure, such as its radius, the radius of the internal annular flow water, and the angular velocity of the annular flow water are taken as the design parameters, and a large number of comparative calculations based on the fluid–solid coupling theory of potential flow are carried out to determine the appropriate design parameters. Eventually, on the basis of the obtained suitable design parameters, the proposed conceptual design approach is demonstrated to be feasible in view of the energy consumption.

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“…The disadvantage of the DPS is that, it consumes a considerable amount energy the turbine produces. Xu et al (2021) proposed the feasibility of a dynamically positioned semisubmersible 5 MW floating wind turbine in their paper. It was found that the DPS utilized approximately 1/2 of the total generated energy when the current forces are not considered and the ratio becomes 4/5 when current forces are taken into account (Xu et al (2021)).…”

Section: Dynamic Positioning For Fowtsmentioning

confidence: 99%

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Ramachandran

2021

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A novel conceptual design of a dynamically positioned floating wind turbine

Cited by 27 publications

References 16 publications

A Novel Automatic Method for the Urban Canyon Parametrization Needed by Turbulence Numerical Simulations for Wind Energy Potential Assessment

A Novel Automatic Method for the Urban Canyon Parametrization Needed by Turbulence Numerical Simulations for Wind Energy Potential Assessment

Engineering Possibility Studies of a Novel Cylinder-Type FOWT Using Torus Structure with Annular Flow

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