Small wind turbine augmentation: Experimental investigations of shrouded- and twin-rotor wind turbine systems

Lipian, Michał; Dobrev, Ivan; Karczewski, Maciej; Massouh, Fawaz; Jóźwik, Krzysztof

doi:10.1016/j.energy.2019.115855

Cited by 42 publications

(18 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A considerable increase in the generated power of horizontal axis wind turbines were obtained with different shroud geometries in [3]. Experimental investigations of wind turbine systems presented in [4] also show that shrouding turbine can remarkably increase power coefficient. In addition, the obtained results indicate the potential in using twin rotor (which are usually Counter-Rotating Open Rotor devices) at small separation distances between rotor rotation planes.…”

Section: Introductionmentioning

confidence: 86%

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Barbarić

Guzović

2020

Energies

View full text Add to dashboard Cite

Horizontal axis turbines are commonly used for harnessing renewable hydrokinetic energy, contained in marine and river currents. In order to encourage the expansion of electricity generation using micro-hydrokinetic turbines, several design improvements are investigated. Firstly, optimization-based design of rotor blade is used to get as close as possible to the efficiency limit of 59.3% (known as Betz limit), that counts for bare turbine rotors, placed in the free flow. Additional diffuser elements are further added to examine the potential to overcome the theoretical efficiency limit by accelerating water at the axial direction. Various diffuser geometrical configurations are investigated using the computational fluid dynamics (CFD) to obtain insight into hydrodynamics of augmented micro-hydrokinetic turbines. Moreover, the turbines are compared from the energy conversion efficiency point of view. The highest maximum power coefficient increase of 81% is obtained with brimmed (flanged) diffuser. Diffusers with foil-shaped cross-sections have also been analyzed but power augmentation is not significantly greater than in the case of simple cross-section designs of the same dimensions. The power coefficients’ comparison indicate that considerable power augmentation is achievable using brimmed diffuser with higher value of length-to-diameter ratio. However, the impact of diffuser length increase on the power coefficient enhancement becomes weaker as the length-to-diameter ratio reaches a value of 1.

show abstract

Section: Introductionmentioning

confidence: 86%

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Barbarić

Guzović

2020

Energies

View full text Add to dashboard Cite

show abstract

“…Wind-lens designs have been proven practical and efficient; it might increase the turbine torque by 100% as reported by Ohya et al 11,18) but with the price of a total drag increase. Many other researchers have further investigated the concept of the wind lens or flanged diffuser [19][20][21][22] .…”

Section: Difference Between Dawt and Wind Lensmentioning

confidence: 99%

Wind Lens Performance Investigation at Low Wind Speed

Takeyeldein¹,

Lazim²,

Ishak³

et al. 2020

Evergreen

View full text Add to dashboard Cite

“…SWTs, studied at Institute of Turbomachinery of Lodz University of Technology, incorporate both experimental [16] and numerical [17] research. The increasing use of new manufacturing technologies in SWT studies and prototype manufacturing [18] makes it essential to ensure rotor blade integrity and safe operation.…”

Section: Small Wind Turbines-interest and Researchmentioning

confidence: 99%

Fluid–Structure Interaction Numerical Analysis of a Small, Urban Wind Turbine Blade

2020

Self Cite

View full text Add to dashboard Cite

While the vast majority of the wind energy market is dominated by megawatt-size wind turbines, the increasing importance of distributed electricity generation gives way to small, personal-size installations. Due to their situation at relatively low heights and above-ground levels, they are forced to operate in a low energy-density environment, hence the important role of rotor optimization and flow studies. In addition, the small wind turbine operation close to human habitats emphasizes the need to ensure the maximum reliability of the system. The present article summarizes a case study of a small wind turbine (rated power 350 W @ 8.4 m/s) from the point of view of aerodynamic performance (efficiency, flow around blades). The structural strength analysis of the blades milled for the prototype was performed in the form of a one-way Fluid–Structure Interaction (FSI). Blade deformations and stresses were examined, showing that only minor deformations may be expected, with no significant influence on rotor aerodynamics. The study of an unorthodox material (PA66 MO polyamide) and application of FSI to examine both structural strength and blade deformation under different operating conditions are an approach rarely employed in small wind turbine design.

show abstract

Small wind turbine augmentation: Experimental investigations of shrouded- and twin-rotor wind turbine systems

Cited by 42 publications

References 27 publications

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Wind Lens Performance Investigation at Low Wind Speed

Fluid–Structure Interaction Numerical Analysis of a Small, Urban Wind Turbine Blade

Contact Info

Product

Resources

About