Computational fluid dynamics analysis of the vertical axis wind turbine blade with tubercle leading edge

Bai, Chi Jeng; Lin, Yang; Lin, San‐Yih; Wang, Weicheng

doi:10.1063/1.4922192

Cited by 49 publications

(15 citation statements)

References 21 publications

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“…The TLE design was effective in the case of higher wind speeds; it maintained a stable flow over the surface. Study on a Vertical Axis Wind Turbine (VAWT) by Bai et al [72] showed performance degradation in the case of a TLE airfoil compared to a straight leading edge. On the other hand, a study by Huang et al [73] on a small scale Horizontal Axis Wind Turbine (HAWT) at low wind speeds showed performance improvements.…”

Section: Tle In Wind Turbine Applicationsmentioning

confidence: 99%

Mimicking the humpback whale: An aerodynamic perspective

Aftab

Razak

Rafie

et al. 2016

Progress in Aerospace Sciences

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Section: Tle In Wind Turbine Applicationsmentioning

confidence: 99%

Mimicking the humpback whale: An aerodynamic perspective

Aftab

Razak

Rafie

et al. 2016

Progress in Aerospace Sciences

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“…According to this analysis, there is a clear benefit to applying this tubercle concept in vertical-axis turbines. A verticalaxis turbine with a tubercle profile on the leading-edge of its blade is expected to increase the coefficient of performance, even though there are negative reports from other researchers that this idea is not profitable [24,25,26]. Whilst in contrast, there is also research that reports such foils have a positive effect [27,28].…”

Section: Prospect Of Tubercle Application In a Vertical-axis Turbinementioning

confidence: 99%

Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine

Utama¹,

Satrio²,

Mukhtasor³

et al. 2020

JMES

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The main disadvantage of the vertical-axis turbine is its low coefficient of performance. The purpose of this work was to propose a method to improve this performance by investigating the hydrodynamic forces and the flow-field of a foil that was modified with a sinusoidal leading-edge tubercle. NACA 63(4)021 was chosen as the original foil since it has a symmetrical profile that is suitable for use on a vertical-axis tidal-current turbine. The study was conducted using a numerical simulation method with ANSYS-CFX Computational Fluid Dynamics (CFD) code to solve the incompressible Reynolds-Averaged Navier-Stokes (RANS) equations. Firstly, the simulation results of the original foil were validated with available experimental data. Secondly, the modified foils, with three configurations of tubercles, were modelled. From the simulation results, the tubercle foils, when compared with the original foil, had similar lift performances at low Angles of Attack (0-8 degrees of AoA), lower lift performances at medium AoA (8-19 degrees) and higher lift performances at high AoA (19-32 degrees). A tubercle foil with Height/Chord (H/C) of 0.05 can maintain the static stall condition until 32 degrees. Therefore, a vertical-axis turbine with tubercle-blades provides an opportunity to increase its performance by extending the operational range for extracting energy in the dynamic stall condition.

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“…Other technologies such as flow control methods, either passive [6] or active [7], are also being investigated to improve the aerodynamic performance of wind turbine aerofoils that suffer increased surface roughness. A passive flow control device, termed as leading edge protuberance, has gained attention [8] in recent years. There is research that shows that leading edge protuberances can significantly improve the aerodynamic performance [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Leading edge topography of blades–a critical review

Wood

Lü

2021

Surf. Topogr.: Metrol. Prop.

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In turbomachinery, their blade leading edges are critical to performance and therefore fuel efficiency, emission, noise, running and maintenance costs. Leading edge damage and therefore roughness is either caused by subtractive processes such as foreign object damage (bird strikes and debris ingestion) and erosion (hail, rain droplets, sand particles, dust, volcanic ash and cavitation) and additive processes such as filming (from dirt, icing, fouling, insect build-up). Therefore, this review focuses on the changes in topography induced by during service to blade leading edges and the effect of roughness and form on performance and efforts to predict and model these changes. The applications considered are focused on wind, gas and tidal turbines and turbofan engines. Repair and protection strategies for leading edges of blades are also reviewed. The review shows additive processes are typically worse than subtractive processes, as the roughness or even form change is significant with icing and biofouling. Antagonism is reported between additive and subtractive roughness processes. There are gaps in the current understanding of the additive and subtractive processes that influence roughness and their interaction. Recent work paves the way forward where modelling and machine learning is used to predict coated wind turbine blade leading edge delamination and the effects this has on aerodynamic performance and what changes in blade angle would best capture the available wind energy with such damaged blades. To do this generically there is a need for better understanding of the environment that the blades see and the variation along their length, the material or coated material response to additive and/or subtractive mechanisms and thus the roughness/form evolution over time. This is turn would allow better understanding of the effects these changes have on aerodynamic/ hydrodynamic efficiency and the population of stress raisers and distribution of residual stresses that result. These in turn influence fatigue strength and remaining useful life of the blade leading edge as well as inform maintenance/repair needs.

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Computational fluid dynamics analysis of the vertical axis wind turbine blade with tubercle leading edge

Cited by 49 publications

References 21 publications

Mimicking the humpback whale: An aerodynamic perspective

Mimicking the humpback whale: An aerodynamic perspective

Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine

Leading edge topography of blades–a critical review

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