CFD Investigation on the Aerodynamic Interferences between Medium-solidity Darrieus Vertical Axis Wind Turbines

Giorgetti, Simone; Pellegrini, G.; Zanforlin, Stefania

doi:10.1016/j.egypro.2015.12.089

Cited by 43 publications

(30 citation statements)

References 10 publications

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“…The aerodynamic interactions between closely-placed VAWTs have also been studied numerically by computational fluid dynamics (CFD). Giorgetti et al [16] used ANSYS CFD to analyze the aerodynamic interferences in counter-rotating and co-rotating arrangements. Bremseth and Duraisamy [17] showed that the aerodynamic interference between turbines gives rise to regions of excess momentum between the turbines that leads to significant power augmentation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Aerodynamic Interactions of Closely-Placed Vertical Axis Wind Turbine Pairs

Peng

2018

Energies

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In this study, a numerical model was developed to study the effects of aerodynamic interactions between a pair of counter-rotating vertical axis wind turbines (VAWTs) in close proximity. In this model, the rotor rotation is not prescribed as a constant as in most other studies, but is determined by the moment of inertia and the total torque of the rotor, including the aerodynamic torque, generator torque, and a torque representing friction. This model enables study of the behavior of the rotor under an arbitrary ambient wind profile. The model was applied to an isolated rotor with five straight J-blades and pairs of identical rotors placed in close proximity. Compared with an isolated rotor, the aerodynamic interactions between the pair of rotors enhance the aerodynamic torques on the rotors and significantly increase the turbine power output on a per unit basis. The enhancement in turbine power output due to aerodynamic enhancement decreases with the distance between the pair of rotors.

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Section: Introductionmentioning

confidence: 99%

Effects of Aerodynamic Interactions of Closely-Placed Vertical Axis Wind Turbine Pairs

Peng

2018

Energies

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“…Several recent studies (Bremseth and Duraisamy [48], Dabiri [49], Giorgetti et al [50]) suggested that unlike HAWTs, VAWTs demand less stringent spacing requirements and optimising the positioning and rotation (co-/counter-rotating) of the closely spaced multi VAWT arrangement, could lead to improved performance. Giorgetti et al [50] used CFD to investigate the enhancement in power that can be achieved by setting medium to high solidity and thus low TSR Darrieus micro turbines in close proximity.…”

Section: Micro-small Scalementioning

confidence: 99%

“…Giorgetti et al [50] used CFD to investigate the enhancement in power that can be achieved by setting medium to high solidity and thus low TSR Darrieus micro turbines in close proximity. CFD simulations were conducted to assess the aerodynamic interferences in two-and four-rotor formations as shown in Figure 10.…”

Section: Micro-small Scalementioning

confidence: 99%

A Review of Numerical Modelling of Multi-Scale Wind Turbines and Their Environment

et al. 2018

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Abstract:Global demand for energy continues to increase rapidly, due to economic and population growth, especially for increasing market economies. These lead to challenges and worries about energy security that can increase as more users need more energy resources. Also, higher consumption of fossil fuels leads to more greenhouse gas emissions, which contribute to global warming. Moreover, there are still more people without access to electricity. Several studies have reported that one of the rapidly developing source of power is wind energy and with declining costs due to technology and manufacturing advancements and concerns over energy security and environmental issues, the trend is predicted to continue. As a result, tools and methods to simulate and optimize wind energy technologies must also continue to advance. This paper reviews the most recently published works in Computational Fluid Dynamic (CFD) simulations of micro to small wind turbines, building integrated with wind turbines, and wind turbines installed in wind farms. In addition, the existing limitations and complications included with the wind energy system modelling were examined and issues that needs further work are highlighted. This study investigated the current development of CFD modelling of wind energy systems. Studies on aerodynamic interaction among the atmospheric boundary layer or wind farm terrain and the turbine rotor and their wakes were investigated. Furthermore, CFD combined with other tools such as blade element momentum were examined. Keywords:Computational Fluid Dynamic (CFD); micro to small wind turbine; building integrated with wind turbine; wind farm; aerodynamic interaction; wind energy systems; atmospheric boundary layer (ABL); blade element momentum (BEM)

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“…Furthermore, counter-rotating VAWTs in close proximity have been shown experimentally [5] and numerically [3] to have a mutually beneficial effect on power production.…”

Section: Introductionmentioning

confidence: 99%

“…The pursuit of reducing the cost of offshore wind energy in deep waters has led to a re-emerging interest in vertical-axis wind turbines (VAWTs) for floating applications due to apparent advantages over conventional horizontal-axis wind turbines (HAWTs) [1,2,3]. In parallel, there is a resurgence of interest in VAWTs as a promising alternative to HAWTs also for small-scale electric power in urban areas [4].…”

Section: Introductionmentioning

confidence: 99%

3D URANS analysis of a vertical axis wind turbine in skewed flows

Orlandi

Collu

Zanforlin

et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

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The article demonstrates the potential of an unsteady RANS 3D approach to predict the effects of skewed winds on the performance of an H-type vertical-axis wind turbine (VAWT). The approach is validated through a comparison between numerical and experimental results for a full-scale Darrieus turbine, demonstrating an improved prediction ability of 3D CFD with respect to both 2D CFD and semi-empirical models based on the double multiple stream tubes method. A 3D URANS approach is then adopted to investigate the power increase observed for a straight-bladed small-scale turbine in a wind tunnel when the rotational axis is inclined from 0 • to 15 • from the vertical. The main advantage of this approach is a more realistic description of complex three-dimensional flow characteristics, such as dynamic stall, and the opportunity to derive local blade flow conditions on any blade portion during upwind and downwind paths. Consequently, in addition to deriving the turbine overall performance in terms of power coefficient, a better insight into the temporal and spatial evolution of the physical mechanisms is obtained. Our principal finding is that the power gain in skewed flows is obtained during the downwind phase of the revolution as the end part of the blade is less disturbed by the wake generated during the upwind phase.

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CFD Investigation on the Aerodynamic Interferences between Medium-solidity Darrieus Vertical Axis Wind Turbines

Cited by 43 publications

References 10 publications

Effects of Aerodynamic Interactions of Closely-Placed Vertical Axis Wind Turbine Pairs

Effects of Aerodynamic Interactions of Closely-Placed Vertical Axis Wind Turbine Pairs

A Review of Numerical Modelling of Multi-Scale Wind Turbines and Their Environment

3D URANS analysis of a vertical axis wind turbine in skewed flows

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