The application of passive air jet vortex-generators to stall suppression on wind turbine blades

Prince, Simon; Badalamenti, Carmine; Regas, Constantinos

doi:10.1002/we.1994

Cited by 22 publications

(10 citation statements)

References 30 publications

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“…In this study, utilizing a series of air ducts that will be designed on the blade according to the local velocity vector which caused the kinetic energy of the low-momentum fluid close to the surface can be increased by providing the interaction between the airflow was tried. Thus, the separation of the boundary layer from the upper surface of the blade is delayed [32].…”

Section: Methodsmentioning

confidence: 99%

Effect of Air-Ducted Blade Design on Horizontal Axis Wind Turbine Performance

Yiğit

2020

Energies

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Wind turbines without pitch control are more preferable from economical point of view but aerodynamic stall affects them more and after a critical wind speed local boundary layer separation occurs. Consequently, their power production is relatively low. In this study, air ducts added on the blade and using the airflow from them the kinetic energy of the low-momentum fluid behind the surface was increased and delay of separation of the boundary layer from the surface was examined The Response Surface Optimization method was utilized in order to get the best possible design under the constraints and targets arranged for the parameters termed the diameter, slope, number and angle of attack of the air ducts. By using computational fluid dynamics analysis, optimum parameter values were obtained and air-ducted and air-duct free blade designs were compared. An improvement in power coefficient between 3.4–4.4% depending on wind speed was achieved with the new design. Due to increase in viscous forces, more power from the rotor obtained by opening air ducts up to a critical number. However, the results showed that after the critical number of air duct addition of more duct on the blade reduced the power coefficient.

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Section: Methodsmentioning

confidence: 99%

Effect of Air-Ducted Blade Design on Horizontal Axis Wind Turbine Performance

Yiğit

2020

Energies

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“…More novel proposed designs can be found in Chong et al [94], Kumbernuss et al [95], Prince et al [96] and Yao et al [97]. Perhaps the most interesting and well-researched solution to improve the performance of urban wind turbines is the shrouded rotor concept (for an introductory aerodynamic overview, the reader may wish to refer to Hansen [98]).…”

Section: Rotor Designmentioning

confidence: 99%

A Review of Urban Wind Energy Research: Aerodynamics and Other Challenges

Micaleff

Bussel

2018

Energies

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Urban wind energy research is crucial for the success or failure of wind turbines installed in the built environment. Research in this field is fragmented into various research groups working on different topics in isolation with seemingly few efforts of integrating the various fields. This review aims at highlighting the synergies between the various advances, particularly in aerodynamics, but also in other areas. Past and current work has been focused on establishing reliable wind statistics at the site of interest. Advances in building aerodynamics have provided new insight on the local flow occurring at the rotor location. An outlook toward future research and the need to treat the different flow scales in a holistic manner is emphasized given also the recent advances in rotor aerodynamics related to the effect of flow skewness and turbulence. This will shed light on the critical issues that need to be addressed by scientists in order to make urban wind energy viable for decentralized generation. Various other present challenges are discussed briefly including structural aspects, noise emissions, economics and visual impact. Research in this field should be the guidepost for more targeted certification standards, in an effort to regularize the small wind energy market.

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“…Passive vortex generators have been investigated recently in wind turbine applications [143][144][145][146][147] where the flow separation reduces power at start-up and low wind speeds [87]. In addition to the wind turbines, they have been investigated in centrifugal compressors [148], tractor-trailers [149] and aeroplanes [150].…”

Section: Turbulence and Vortex Generators (Classification: Passive Gmentioning

confidence: 99%

“…Streamwise vortices generated by the vortex generators entrain high-momentum fluid into the boundary layer resulting in eliminated or delayed separation [143] or induced reattachment [151]. Similarly, the vortex generators affect the interaction between shock waves and boundary layers resulting in the reduction of shock-induced separation [152].…”

Section: Turbulence and Vortex Generators (Classification: Passive Gmentioning

confidence: 99%

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

Tiainen

Grönman

Jaatinen-Värri

et al. 2017

IJTPP

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Abstract:The decrease in the performance of centrifugal compressors operating at low Reynolds numbers (e.g., unmanned aerial vehicles at high altitudes or small turbomachines) can reach 10% due to increased friction. The purposes of this review are to represent the state-of-the-art of the active and passive flow control methods used to improve performance and/or widen the operating range in numerous engineering applications, and to investigate their applicability in low-Reynolds-number centrifugal compressors. The applicable method should increase performance by reducing drag, increasing blade loading, or reducing tip leakage. Based on the aerodynamic and structural demands, passive methods like riblets, squealers, winglets and grooves could be beneficial; however, the drawbacks of these approaches are that their performance depends on the operating conditions and the effect might be negative at higher Reynolds numbers. The flow control method, which would reduce the boundary layer thickness and reduce wake, could have a beneficial impact on the performance of a low-Reynolds-number compressor in the entire operating range, but none of the methods represented in this review fully fulfil this objective.

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The application of passive air jet vortex-generators to stall suppression on wind turbine blades

Cited by 22 publications

References 30 publications

Effect of Air-Ducted Blade Design on Horizontal Axis Wind Turbine Performance

Effect of Air-Ducted Blade Design on Horizontal Axis Wind Turbine Performance

A Review of Urban Wind Energy Research: Aerodynamics and Other Challenges

Flow Control Methods and Their Applicability in Low-Reynolds-Number Centrifugal Compressors—A Review

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