Experiment and Simulation Effects of Cyclic Pitch Control on Performance of Horizontal Axis Wind Turbine

Sang, Le Quang; Maeda, Takao; Kamada, Y.; Li, Qingan

doi:10.14710/ijred.6.2.119-125

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Wind is one of renewable energy forms that has been paid attention to recently because it is considered as clean and green energy with non-carbon emissions (Marih et al, 2020) (Nguyen et al, 2021) (Hassoine et al, 2022). Thus, studies on wind turbine are taken the great interest (Sang et al, 2017) Shoukat et al, 2021). In contrast to conventional turbines that depended on fluid impinging on curved blades, Nikola Tesla revolutionized the field by exploiting the boundary layer effect of fluid on flat, circular discs to generate mechanical rotary power (Talluri et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations on a bladeless turbine: Tesla's cohesion-type innovation

Sivaramakrishnaiah,

Nasan,

Sharma

et al. 2023

Int. J. Renew. Energy Dev.

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The design, numerical simulation, manufacturing, and physical experimentation of Tesla's bladeless centripetal turbine for electrical power production are the topics of this research project. The turbine generates rotational motion in the discs by directing pressurized air and water tangentially across parallel smooth disc surfaces. The fluid speed parameter at the nozzle inlet determines the power generated. To ensure optimal mechanical design parameters, SolidWorks design software, fluid dynamics concepts, and machine element design were employed. The numerical simulation software ANSYS CFX was used. The numerical and qualitative findings of the models and physical experiments coincided well. The study revealed that the power production and turbine efficiency were regulated by the input sources and blade size. Variations in the fluid composition between the discs may additionally have an impact on the outcomes. The researchers investigated the connection between input fluid pressure and turbine efficiency, as well as the number of discs and turbine power. The prototype could generate 76.52 W of electricity at 50 bar pressure and 1.01e+05 Reynolds number. The operation was efficiently simulated using CFD, with only a 9.3% difference between experimental and simulated results. Overall, this research provides an in-depth assessment of Tesla's bladeless centripetal turbine. It verifies the design and numerical simulation methodologies used, as well as identifies the essential aspects impacting turbine performance and efficiency. The findings contribute to a better understanding of the turbine's behavior and give ideas for improving its performance.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations on a bladeless turbine: Tesla's cohesion-type innovation

Sivaramakrishnaiah,

Nasan,

Sharma

et al. 2023

Int. J. Renew. Energy Dev.

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show abstract

“…As the most common wind energy capture device, the performances of wind turbines, including horizontal and vertical axis wind turbines, are critical to the efficiency of energy conversion. However, as the rotor diameter grows, so do the unsteadiness and nonlinearity of the turbine blades, which results in the deterioration of aerodynamic performance of wind turbine airfoils, especially the impact from dynamic stall caused by yaw motion, free stream turbulence, impinging gusts, and tower shadow [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of dynamic stall flow control using a microsecond-pulsed plasma actuator

Zeyang

Gao

et al. 2023

Plasma Sci. Technol.

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To alleviate the performance deterioration caused by dynamic stall of the wind turbine airfoil, the flow control by microsecond-pulsed dielectric barrier discharge (MP-DBD) actuator on the dynamic stall of a periodically pitching NACA0012 airfoil was investigated experimentally. The unsteady pressure measurements with high temporal accuracy were employed in this study, and the unsteady characteristics of the boundary layer were investigated by wavelet packet analysis and the moving root mean square (RMS) method based on the acquired pressure. The experimental Mach number was Ma =0.2, and the chord-based Reynolds number was Re = 870000. The dimensionless actuation frequencies F+ were chosen to be 0.5, 1, 2, and 3, respectively. For the light dynamic regime, the MP-DBD plasma actuator plays the role of suppressing flow separation from the trial edge and accelerating the flow reattachment due to the high momentum freestream flow being entrained into the boundary layer. Meanwhile, actuation effects were promoted with the increasing dimensionless actuation frequency F+. The control effects of the deep dynamic stall were to delay the onset and reduce the strength of the dynamic stall vortex (DSV), due to the accumulating vorticity near the leading edge being removed by the induced coherent vortex structures. The laminar fluctuation and K-H (Kelvin-Helmholtz) instabilities of transition and relaminarization were also mitigated by the MP-DBD actuation, and the alleviated K-H rolls lead to the delay of the transition onset and earlier laminar reattachment, which improved the hysteresis effect of the dynamic stall. For the controlled cases of F+ = 2, and F+ = 3, the laminar fluctuation was replaced by relatively low frequency band disturbances corresponding to the harmonic responses of the MP-DBD actuation frequency.

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Numerical simulation of dynamic stall flow control using a multi-dielectric barrier discharge plasma actuation strategy

Zeyang

Gao

et al. 2022

Physics of Plasmas

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To alleviate the deterioration in wind turbine performance caused by dynamic stall, the flow control of a pitching NACA0012 airfoil is investigated through numerical simulation of an alternating current dielectric barrier discharge (AC-DBD) plasma actuator at a Reynolds number Re = 135 000. To avoid the harmonic oscillations of aerodynamic force caused by unsteady DBD actuation, this work focuses on improving the control potential for steady actuation. The control mechanisms of actuators at various positions are investigated using five groups of actuators mounted at 0%, 3%, 10%, 45%, and 80% chord lengths c above the upper surface of an airfoil. The actuator at 80% c performs more efficiently in terms of lift enhancement in the initial upstroke and the final downstroke. The actuator at 0% c suppresses the growth of the leading-edge vortex and maintains the suction of the dynamic stall vortex (DSV). After the shedding of the DSV, it suppresses the secondary separation to delay the onset of dynamic stall. At the flow reattachment stage, the actuators at 3% c and 10% c accelerate the boundary layer reattachment by momentum injection. From these results, a multi-DBD control strategy is proposed. The scheme selects the optimal actuator in operation at a certain stage of dynamic stall and takes advantage of actuators at different positions to enhance the average and maximum aerodynamic force, delay the onset of dynamic stall, accelerate flow reattachment, and avoid excessive energy consumption.

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Experiment and Simulation Effects of Cyclic Pitch Control on Performance of Horizontal Axis Wind Turbine

Cited by 4 publications

References 12 publications

Numerical and experimental investigations on a bladeless turbine: Tesla's cohesion-type innovation

Numerical and experimental investigations on a bladeless turbine: Tesla's cohesion-type innovation

Experimental investigation of dynamic stall flow control using a microsecond-pulsed plasma actuator

Numerical simulation of dynamic stall flow control using a multi-dielectric barrier discharge plasma actuation strategy

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