Streamwise vortex generator for separation reduction on wind turbine profile

Suarez, Javier Martinez; Flaszyński, Paweł; Doerffer, Piotr

doi:10.1088/1742-6596/760/1/012018

Cited by 8 publications

(13 citation statements)

References 7 publications

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“…Rod vortex generators are located at the blade mid‐chord, the optimum location of RVGs for the S809 profile . Rod vortex generator dimensions are scaled according to the mid‐chord boundary layer thickness at reference section (75 % of blade radius) and 10 m/s wind speed.…”

Section: Implementation Of Rvgs On Wind Turbine Rotormentioning

confidence: 99%

“…Previous research conducted by Martinez‐Suarez et al, on the application of RVGs to wind turbine profiles, evaluated the effect on separation not only of RVGs dimensions and spanwise distance but also of x RVG / c . The latest parameter showed strong impact on the separation due to the distance of devices to separation onset.…”

Section: Introductionmentioning

confidence: 99%

“…In previous investigations, the radial (spanwise) effects occurring in wind turbines were not taken into account . Therefore, this paper presents the impact of RVG on local flow structure, boundary layer separation reduction, and positive influence on aerodynamic performance of wind turbine rotor blade.…”

Section: Introductionmentioning

confidence: 99%

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Application of rod vortex generators for flow separation reduction on wind turbine rotor

2018

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This paper focuses on flow control on wind turbine blades. A rod vortex generator (RVG) is proposed. Previous experimental and numerical results obtained for channels and blade sections proved RVGs to effectively enhance the streamwise shear stresses and reduce flow separation. The benefits of application of RVGs to control and decrease the flow separation on horizontal axis wind turbine rotor blades are assessed and presented in the paper. The numerical investigation was conducted with the FINE/Turbo solver from Numeca International, which solves the 3D Reynoldsaveraged Navier-Stokes equations. The validation of the numerical model for the clean case is based on phase VI of the Unsteady Aerodynamics Experiment. At selected operating conditions, flow control devices have proven to reattach the flow locally to the wall and improve the aerodynamic performance of the wind turbine. Additionally, the local implementation of RVGs shows strong effect on flow structure and interaction with the main flow to create a "shielding" effect, preventing further penetration of separation towards blade tip. As a consequence, the positive effect of RVGs exists outside the blade span covered by devices. The obtained aerodynamic improvement shows that RVGs may be used as an alternative to traditional flow control devices applied on wind energy turbines. KEYWORDS flow control, flow separation, NREL phase VI, vortex generator, wind energy 1 | INTRODUCTIONSince the industrial revolution, the world demand for energy has grown at a much faster rate than in all previous human history. As a consequence, man's dependency on fossil fuels and green house gasses emissions has risen ever since. In this context, wind energy is seen as one of the most promising solutions to man's ever-increasing demands of a clean source of energy. 1 The main drawback of wind energy compared with nonrenewable energy sources is the cost of energy (COE). The COE may be reduced by increasing the annual energy production (AEP) or decreasing the operation and maintenance cost. This increase of AEP may be achieved through higher availability of the system, thereby reducing the downtime.Nevertheless, the average availability of the onshore horizontal axis wind turbines ranges from 96% to 99%, which indicates slight scope for improvement. 2 The AEP may be also enhanced by increasing wind turbine and rotor sizes. A larger turbine can capture more energy through its lifetime, decreasing the relative COE per megawatt. The last decades development in the material science, control, and aerodynamics have allowed this growth of wind turbines sizes and a continuous reduction in COE. 3 At the end of 1989, a 300-kW wind turbine with 30-m rotor diameter was state of the art; nowadays, turbines with rotor diameters of up to 160 m (Vestas V164-8MW or V164-9.5MW) have been developed, and the current trend of increasing sizes is expected to continue in the future. 4,5 Presence of flow separation on wind turbine blades leads to increased aerodynamic losses, noise generation, and fatigue ...

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Section: Implementation Of Rvgs On Wind Turbine Rotormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application of rod vortex generators for flow separation reduction on wind turbine rotor

2018

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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%

“…To delay the separation, the vortex generators should be placed close to the natural separation point [146,153,154]. The vortex generators have been shown to delay the dynamic stall of wind turbines if placed at the leading edge [145], to weaken the secondary flow in compressor cascade passage if placed at the endwall [74], and to induce reattachment if placed on the suction side of the compressor blade [74,155].…”

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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Dynamic mode decomposition analysis of flow separation control on wind turbine airfoil using leading−edge rod

Zhong

Liu

2023

Energy

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Streamwise vortex generator for separation reduction on wind turbine profile

Cited by 8 publications

References 7 publications

Application of rod vortex generators for flow separation reduction on wind turbine rotor

Application of rod vortex generators for flow separation reduction on wind turbine rotor

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

Dynamic mode decomposition analysis of flow separation control on wind turbine airfoil using leading−edge rod

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