Performance analysis of a small-scale Orthopter-type Vertical Axis Wind Turbine

Cheikh, Amne El; Elkhoury, M.; Kiwata, Takahiro; Kono, Toru

doi:10.1016/j.jweia.2018.07.008

Cited by 17 publications

(8 citation statements)

References 23 publications

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“…The main factors for the better performance of our O-VAWT as compared to Shimizu et al's O-VAWT can be the number of blades and the cross-sectional shape of the blades. In our previous studies, the maximum Cp improved from 0.189 to 0.244 by changing the number of blades from two to three [33] and improved from 0.246 to 0.288 by changing the crosssectional shape of blades from ellipse to rectangle [23]. and torque coefficient (C T ) with tip speed ratios (λ) by the experiments and CFD simulations, (b) rotor-revolution (C T_rev ) and blade-rotation (C T_rot ) components of torque coefficients (C T ) computed by the CFD simulations.…”

Section: Performance In Uniform Flowmentioning

confidence: 94%

“…The CFD software utilized to simulate the wind flow field was ANSYS Fluent 17.2 [31,32]. The numerical approach was based on our previous paper [22,33], in which the CFD simulations with the delayed detached eddy simulation (DDES) turbulence model of flow around the O-VAWT were conducted and the validities of the grid resolution and the time-step size were confirmed.…”

Section: Numerical Approachmentioning

confidence: 99%

“…In all domains, only unstructured meshes were used. Based on our previous mesh-resolution dependency tests [33], the number of computational cells in each domain were set as shown in Table 2. The total number of computational cells was approximately 10 million.…”

Section: Numerical Setupmentioning

confidence: 99%

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Performance Characteristics of an Orthopter-Type Vertical Axis Wind Turbine in Shear Flows

2020

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To properly conduct a micro-siting of an orthopter-type vertical axis wind turbine (O-VAWT) in the built environment, this study investigated the effects of horizontal shear flow on the power performance characteristics of an O-VAWT by performing wind tunnel experiments and computational fluid dynamics (CFD) simulations. A uniform flow and two types of shear flow (advancing side faster shear flow (ASF-SF) and retreating side faster shear flow (RSF-SF)) were employed as the approaching flow to the O-VAWT. The ASF-SF had a higher velocity on the advancing side of the rotor. The RSF-SF had a higher velocity on the retreating side of the rotor. For each type of shear flow, three shear strengths (Γ = 0.28, 0.40 and 0.51) were set. In the ASF-SF cases, the power coefficients (Cp) were significantly higher than the uniform flow case at all tip speed ratios (λ) and increased with Γ. In the RSF-SF cases, CP increased with Γ. However, when Γ = 0.28, the CP was lower than the uniform flow case at all λ. When Γ = 0.51, the CP was higher than the uniform flow case except at low λ; however, it was lower than the ASF-SF case with Γ = 0.28. The causes of the features of CP were discussed through the analysis of the variation of blade torque coefficient, its rotor-revolution component and its blade-rotation component with azimuthal angle by using the CFD results for flow fields (i.e., horizontal velocity vectors, pressure and vorticity). These results indicate that a location where ASF-SFs with high Γ values dominantly occur is ideal for installing the O-VAWT.

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Section: Performance In Uniform Flowmentioning

confidence: 94%

Section: Numerical Approachmentioning

confidence: 99%

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Performance Characteristics of an Orthopter-Type Vertical Axis Wind Turbine in Shear Flows

2020

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“…In 2013, Kot et al [19] studied the maximum peak power tracking (MPPT) algorithm for a HAWT with a permanent magnet synchronous generator (PMSG) of 5 kW. Innovative types of wind turbines were also proposed for the application in the rural or urban areas, such as shrouded-and twin-rotor wind turbines [20], small-scale orthopter-type vertical axis wind turbines [21], and small wind energy portable turbines (SWEPTs) [22], etc.…”

Section: Introductionmentioning

confidence: 99%

Power Flow Analysis on the Dual Input Transmission Mechanism of Small Wind Turbine Systems

et al. 2020

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A parallel planetary gear train design is proposed to construct the wind turbine system that has double inputs and one output. The proposed system is flexible for the application, which may use a combination of two rotors, as used for horizontal axis or vertical axis wind turbines. The proposed transmission mechanism merges the dual time varied input wind powers to a synchronous generator. The effect of the gear train parameters on the dynamic power flow variation is modeled and simulated for the proposed wind turbine system. Results indicate the proposed planetary gear train system is a feasible and efficient design for its application to wind turbine systems. The dynamic torque equilibrium equations between meshed gear pairs are employed to analyze the dynamic power flow. The nonlinear behavior of a synchronous generator is also included in the modeling. The dynamic responses of the dual input transmission mechanism are simulated using the 4th order Runge–Kutta method. The study also investigates the effect of system parameters used in this wind turbine system (i.e., the wind speed, the magnetic flux synchronous generator, and the inertia of flywheels) on variations in electrical power output.

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“…Such an advantage makes VAWTs, or in general search for alternative ways of wind energy harvesting, a focus of extensive research in recent years. 3–11 Quantitatively, number of journal citations to VAWTs has increased from 14 in 2006 to 1600 in 2016 and the number of published articles has increased by a similar factor. 12 In order to address the drawbacks and enhance performance, various techniques such as design and shape optimizations, 13–15 active or passive flow control techniques, 16–26 variable-pitch blades, 27,28 inclusion of additional flow deflectors or casings 29–33 and power enhancement via paired or farm configurations 34–38 are recently being investigated in detail for several different types (both lift and drag based) of VAWTs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of radial turbines for wind energy harvesting

Gürbüz

İlhan²,

Acarer

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Wind energy has been a research focus of the last few decades, promoting the topic to a much more matured level. However, the body of literature is built around a limited number of turbine types and it is still beneficial to increase turbine diversity for the opportunity to select optimal turbine for a given purpose. The radial (inflow) turbines known in gas and hydro turbine industries for pressurized pipe flows are undiscovered turbines for free-stream wind harvesting both in air and underwater. In such case, the wind tangentially interacts with each blade by an external casing; therefore, all blade angular positions may, at least in theory, contribute equally to power production. Enclosed compact architecture with low rotational speeds and narrow intake ports may possess advantages in enabling the use of much weaker but more recyclable and long-lasting blades and in applications such as integrated wind harvesting for blunt bodies like buildings, vessels and devices or for any application where an open rotor is not feasible. Using experimentally validated Reynolds-averaged Navier–Stokes simulations, mass swallowing capacities and corresponding efficiencies of such turbines are parametrically investigated at low Reynolds numbers, Re chord=11 × 103, and finally enhancement is shown in 88 × 103. Findings provide first insights into such turbines. Considering the investigated very low Reynolds numbers and three-dimensional effects, comparable performance with other small turbines are observed. Moreover, undiscovered potential for performance optimization persists.

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Performance analysis of a small-scale Orthopter-type Vertical Axis Wind Turbine

Cited by 17 publications

References 23 publications

Performance Characteristics of an Orthopter-Type Vertical Axis Wind Turbine in Shear Flows

Performance Characteristics of an Orthopter-Type Vertical Axis Wind Turbine in Shear Flows

Power Flow Analysis on the Dual Input Transmission Mechanism of Small Wind Turbine Systems

Investigation of radial turbines for wind energy harvesting

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