A Straight-Bladed Variable-Pitch VAWT Concept for Improved Power Generation

Staelens, Yann; Saeed, Farooq; Paraschivoiu, Ion

doi:10.1115/wind2003-524

Cited by 23 publications

(30 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, Reynolds number and angle of attack are in dynamic change and are functions of azimuth angle . more details can be found in literature [26].…”

Section: Flow Field Of Bladementioning

confidence: 99%

Aerodynamic Performance Prediction of Straight-Bladed Vertical Axis Wind Turbine Based on CFD

Zhang

Liang

Liu

et al. 2013

Advances in Mechanical Engineering

View full text Add to dashboard Cite

Numerical simulation had become an attractive method to carry out researches on structure design and aerodynamic performance prediction of straight-bladed vertical axis wind turbine, while the prediction accuracy was the major concern of CFD. Based on the present two-dimensional CFD model, a series of systematic investigations were conducted to analyze the effects of computational domain, grid number, near-wall grid, and time step on prediction accuracy. And then efforts were devoted into prediction and analysis of the overall flow field, dynamic performance of blades, and its aerodynamic forces. The calculated results agree well with experimental data, and it demonstrates that RNG k-turbulent model is great to predict the tendency of aerodynamic forces but with a high estimate value of turbulence viscosity coefficient. Furthermore, the calculated tangential force is more dependent on near-wall grid and prediction accuracy is poor within the region with serious dynamic stall. In addition, blades experience mild and deep stalls at low tip speed ratio, and thus the leading edge separation vortex and its movement on the airfoil surface have a significant impact on the aerodynamic performance.

show abstract

“…In addition, Reynolds number and angle of attack are in dynamic change and are functions of azimuth angle . more details can be found in literature [26].…”

Section: Flow Field Of Bladementioning

confidence: 99%

Aerodynamic Performance Prediction of Straight-Bladed Vertical Axis Wind Turbine Based on CFD

Zhang

Liang

Liu

et al. 2013

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…As described in [19] the steep variation in pitch angle makes it difficult to implement. Hence we will use sine functions to try and come as close as possible to the performance increase obtained with a constant incidence function.…”

Section: Sinusoidal Pitch Functionmentioning

confidence: 99%

“…They are relevant in the study of crossflow turbines since they are respectively parasitic and useful forces. The coefficient of performance is proportional to the coefficient of tangential force as described by Equation (19) [27]. This makes C T a relevant parameter for performance evaluation.…”

Section: Experimental Datamentioning

confidence: 99%

“…First the constant incidence law as described by [19] was tried. It aims at maintaining the local incidence at a constant angle slightly below the stall angle.…”

Section: Variable Pitchmentioning

confidence: 99%

“…Ref. [19] used a modified CAARDAV code, the best double multiple streamtube model currently available. They simulated three kinds of pitch laws.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulating variable pitch crossflow water turbines: A coupled unsteady ONERA-EDLIN model and streamtube model

2013

View full text Add to dashboard Cite

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The turbine has 2 straight blades with a NACA 0012 section operating in water at a mean chord Reynolds number of 4 Â 10 4 for tip speed ratio l ¼ 2.5, 5 and 7.5. Good agreement was found for average l ¼ 5, and qualitative agreement could be obtained at low and high l, where dynamic stall effects and interference effects respectively are predominant. This is positive because l ¼ 5 is the closest value from the optimal power production point. Variable pitch is finally introduced in the model and several functions are tested in order to increase efficiency. A maximum increase of 53% on the power coefficient was found to occur with a sinusoidal law.

show abstract

Innovative multiobjective optimization of a curved‐blade vertical axis wind turbine modeled by modified double multiple streamtube method

Sanaye,

Hosseinkhani

2024

Energy Science & Engineering

View full text Add to dashboard Cite

The attractive specifications of vertical axis wind turbine (VAWT) are its operating with low noise and wind in various directions. To achieve a higher performance of these turbines, modeling of a curved‐blade VAWT by the modified double multiple streamtube (DMST) method and optimizing this wind turbine are performed. The power coefficient and the total normal force acting on blades were selected as two objective functions. Minimizing the normal force acting on turbine blades as the second objective function was not observed in the open literature. The amount of normal force is crucial in the structural design of VAWT because it generates both the bending moment on blades and forces on supporting arms of VAWT. Another innovation of this study is to consider the shape coefficient parameter that determines the shape of the rotor geometry as a design variable in optimization procedure. A 3 m height curved‐blade VAWT type was optimized by this multi‐objective optimization technique. The optimum values of the design variables obtained by the Genetic Algorithm were selecting an elliptical rotor geometry, pitch angle −1.4°, diameter/height 1.3, blade aspect ratio 19.8, tip speed ratio 4.3 and selecting three blades which could provide a power coefficient of 0.49 and a normal force of 158.7 N.

show abstract

A Straight-Bladed Variable-Pitch VAWT Concept for Improved Power Generation

Cited by 23 publications

References 5 publications

Aerodynamic Performance Prediction of Straight-Bladed Vertical Axis Wind Turbine Based on CFD

Aerodynamic Performance Prediction of Straight-Bladed Vertical Axis Wind Turbine Based on CFD

Simulating variable pitch crossflow water turbines: A coupled unsteady ONERA-EDLIN model and streamtube model

Innovative multiobjective optimization of a curved‐blade vertical axis wind turbine modeled by modified double multiple streamtube method

Contact Info

Product

Resources

About