Combined experimental and numerical study on the near wake of a Darrieus VAWT under turbulent flows

Molina, Andreu Carbó; Massai, Tommaso; Balduzzi, Francesco; Bianchini, Alessandro; Ferrara, Giovanni; Troyer, Tim De; Bartoli, Gianni

doi:10.1088/1742-6596/1037/7/072052

Cited by 10 publications

(11 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…They showed that the main sources of the H-Darrieus sound pressure field were the separation-stall and the blade vortex interaction. Molina et al 157 examined the time-resolved turbine near wake velocity under turbulent flow by using a traversing hot-wire probe. An improved turbine performance under turbulent flow was found to relate to faster wake recovery and the reduced shaft wake.…”

Section: Traditional Wind Tunnel Measurementmentioning

confidence: 99%

A review of H-Darrieus wind turbine aerodynamic research

Ingram

Dominy

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The H-Darrieus vertical axis turbine is one of the most promising wind energy converters for locations where there are rapid variations of wind direction, such as in the built environment. The most challenging considerations when employing one of these usually small machines are to ensure that they self-start and to maintain and improve their efficiency. However, due to the turbine's rotation about a vertical axis, the aerodynamics of the turbine are more complex than a comparable horizontal axis wind turbine and our knowledge and understanding of these turbines falls remains far from complete. This paper provides a detailed review of past and current studies of the H-Darrieus turbine from the perspective of design parameters including turbine solidity, blade profile, pitch angle, etc. and particular focus is put on the crucial challenge to design a turbine that will self-start. Moreover, this paper summarizes the main research approaches for studying the turbine in order to identify successes and promising areas for future study.

show abstract

Section: Traditional Wind Tunnel Measurementmentioning

confidence: 99%

A review of H-Darrieus wind turbine aerodynamic research

Ingram

Dominy

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…VAWTs produce more power when placed in paired configurations [20,23]; 2. A turbulent environment, such as an urban environment, exhibits beneficial characteristics for the power production of VAWTs [14].…”

Section: Design Parameters Of the Rotormentioning

confidence: 99%

“…At Another difference between the Gen1 and Gen2 testing is the turbulence intensity, which is 0.3 % in the L1-A and 2 % in the GVPM. The effect of turbulence intensity on the rotors is discussed in [14].…”

Section: Gen1 Vs Gen2mentioning

confidence: 99%

See 1 more Smart Citation

Design, manufacturing and validation of a vertical-axis wind turbine setup for wind tunnel tests

Vergaerde

Troyer

Molina

et al. 2019

Journal of Wind Engineering and Industrial Aerodynamics

View full text Add to dashboard Cite

“…Although the majority of installed wind energy power today comes from wind farms made of several large horizontal axis wind turbines (HAWTs), the disclosing of new diffusion frontiers like deep-water offshore applications or installations in densely inhabited environments frontiers like deep-water offshore applications or installations in densely inhabited environments are putting new focus on different turbine architectures, like Darrieus vertical axis wind turbines (VAWTs) [1]. This technology has some undisputed advantages (e.g., the insensitivity to wind direction, the possibility of putting the generation system on the ground, the lower susceptibility to highly turbulent flows [2,3]), but their efficiency is lower compared to that of HAWTs. This is not only due to intrinsically more complex aerodynamics with a continuous variation of the angle of attack (AoA), often leading to dynamic stall [4], but also due to the lack of systematic scientific research from their conception in the 1920s up to the 1990s [2].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on the Effectiveness of Gurney Flaps as Power Augmentation Devices for Airfoils Subject to a Continuous Variation of the Angle of Attack by Use of Full and Surrogate Models

et al. 2020

View full text Add to dashboard Cite

The disclosing of new diffusion frontiers for wind energy, like deep-water offshore applications or installations in urban environments, is putting new focus on Darrieus vertical-axis wind turbines (VAWTs). To partially fill the efficiency gap of these turbines, aerodynamic developments are still needed. This work in particular focuses on the development of a mathematical model that allows predicting the possible performance improvements enabled in a VAWT by application of the Gurney flaps (GFs) as a function of the blade thickness, the rotor solidity and geometry of the Gurney flap itself. The performance of airfoil with GFs was evaluated by means of detailed simulations making use of computational fluid dynamics (CFD). The accuracy of the CFD model was assessed against the results of a dedicated experimental study. In the simulations, a dedicated method to simulate cycles of variation of the angle of attack similar to those taking place in a cycloidal motion (rather than purely sinusoidal ones) was also developed. Based on the results from CFD, a multidimensional interpolation based on the radial basis functions was conducted in order to find the GF design solution that provides the highest efficiency for a given turbine in terms of airfoil and solidity. The results showed that, for the selected study cases based on symmetric airfoils, the GF positioned facing outwards from the turbine, which provides the upwind part of the revolution, can lead to power increments ranging from approximately 30% for the lower-solidity turbine up to 90% for the higher-solidity turbine. It was also shown that the introduction of a GF should be coupled with a re-optimization of the airfoil thickness to maximize the performance.

show abstract

Combined experimental and numerical study on the near wake of a Darrieus VAWT under turbulent flows

Cited by 10 publications

References 17 publications

A review of H-Darrieus wind turbine aerodynamic research

A review of H-Darrieus wind turbine aerodynamic research

Design, manufacturing and validation of a vertical-axis wind turbine setup for wind tunnel tests

Numerical Analysis on the Effectiveness of Gurney Flaps as Power Augmentation Devices for Airfoils Subject to a Continuous Variation of the Angle of Attack by Use of Full and Surrogate Models

Contact Info

Product

Resources

About