scholarly journals Quantifying Wind Turbine Blade Surface Roughness using Sandpaper Grit Sizes: An Initial Exploration

2021 ◽  
Author(s):  
Ivan Nikolov ◽  
Claus Madsen
Keyword(s):  
Surface Roughness ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Blade Surface ◽  
Initial Exploration

Research on Wind Turbine Blade Surface Damage Fault On-Line Monitoring and Diagnosis System

2013 ◽  
Author(s):  
Yongxin Feng ◽  
Tao Yang ◽  
Xiaowen Deng ◽  
Qingshui Gao ◽  
Chu Zhang ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Farm ◽  
Turbine Blades ◽  
Surface Damage ◽  
Wind Turbine Blade ◽  
Offshore Wind ◽  
Blade Surface ◽  
Diagnosis System ◽  
On Line

The basic fault types of wind turbine blades are introduced, a novel blade surface damage detection method based on machine vision is being suggested. The network of wind turbine blade surface damage fault on-line monitoring and fault diagnosis system has already been developed. The system architecture, software modules and functions are described, and given application example illustrates the usefulness and effectiveness of this system. The result shows that this system can monitor the surface damage failure of the blade in real time, and can effectively reduce the blade’s maintenance costs for wind farms, especially offshore wind farm.

Performance Investigation of Non-Linear Insulator against Surface Tracking on Wind Turbine Blade Surface

2014 ◽  
Vol 911 ◽  
pp. 190-194
Author(s):  
Watthanapong Sasimma ◽  
Amnart Suksri
Keyword(s):  
Zinc Oxide ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Saline Solution ◽  
Research Work ◽  
Aluminium Oxide ◽  
Wind Turbine Blade ◽  
Blade Surface ◽  
Surface Tracking ◽  
Modified Epoxy

This research work investigates the surface degradation of wind turbine blade surface insulator which is made from modified epoxy resin mixed with Zinc oxide (ZnO) and Aluminium oxide (Al2O3) in different percentage as a filler elements. Accelerated test with AC voltage of 4.5 kV 50 Hz with NH4Cl saline solution using flow rate of contaminant equals to 0.6 ml/min according to IEC 60587 standard. It was found that, the solid insulators which has 30 % of Zinc oxide (ZnO) and 20% of Aluminium oxide (Al2O3) fillers prolong the process of surface tracking to the order of 5.41 for Zinc oxide (ZnO) filler and also to the order of 30.68 for Aluminium oxide (Al2O3) filler. On the other hand, if the amount of Aluminium oxide (Al2O3) filler is more than 20% by weight, it will lead to a rapid tracking phenomena.

scholarly journals Design and Analysis of Dimple Arrangement on a Small Wind Turbine Blade

2019 ◽  
Vol 9 (2) ◽  
pp. 3552-3557
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Aerodynamic Performance ◽  
Wind Turbine Blade ◽  
Performance Estimation ◽  
Cfd Analysis ◽  
Blade Surface ◽  
Ansys Fluent ◽  
Small Wind Turbine ◽  
Overall Performance

This article predominantly focuses on the performance estimation of a small wind turbine blade when a dimple arrangement is made along its upper surface. The dimple arrangement is grooved at two locations: 0.25c and 0.5c, where c is the chord length of the turbine blade. A CFD analysis using the k-ε turbulence model is carried out on the selected blade sections NREL S823 and S822. The continuity and momentum equations are solved using ANSYS Fluent Solver to assess the aerodynamic performance of the proposed design. The effect of introducing a dimple on the blade surface has shown to delay the flow separation, with the formation of vortices. Further, the overall performance of the blade is simulated using GH BLADED and the results acquired are discussed.

scholarly journals Wear Resistance Performance of Conventional and Non-Conventional Wind Turbine Blades with TiN Nano-Coating

2017 ◽  
Vol 2 (3) ◽  
pp. 37-48
Author(s):  
Muhammad Hasibul Hasan ◽  
Shugata Ahmed
Keyword(s):  
Surface Roughness ◽  
Shear Stress ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Erosion Rate ◽  
Blade Surface ◽  
Impingement Angle ◽  
Nano Coating ◽  
Wind Velocities ◽  
Sand Particles

Efficiency and durability are critical issues that affect widely-adopted aerofoil-power generator as a sustainable source of electrical power. Even though high wind power density can be achieved; installing wind turbines in desert condition has difficulties including thermal variation, high turbulence and sand storms. Sand blasting on turbine blade surface at high velocities causes erosion resulting turbine efficiency drop. Damage-induced erosion phenomena and aeroelastic performance of the blades needed to be investigated. Suitable coating may prevent erosion to a great extent. A numerical investigation of erosion on NACA 4412 wind turbine blade has been performed using commercial computational fluid dynamics software ANSYS FLUENT 14.5 release. Discrete phase model (DPM) has been used for modelling multi-phase flow of air and sand particles over the turbine blade. Governing equations have been solved by finite volume method (FVM). Conventional 30-70% glass fibre resin and non-conventional jute fibre composite have been used as turbine blade material. Sand particles of  diameter have been injected from 20, 30, 45, 60 and 90 degree angles at 500C temperature. Erosion rate, wall shear stress and strain rate have been calculated for different wind velocities and impingement angles. Simulation results for higher velocities deviate from the results observed at lower wind velocities. In simulation, erosion rate is highest for impingement angle at low wind velocities, which has been validated by experiment with a mean absolute error (MAE) of 5.56%. Erosion rate and wall shear stress are higher on jute composite fibre than glass fibre resin. Developed shear stress on wind turbine blade surface is highest for  impingement angle at all velocities. On the other hand, exerted pressure on turbine blade surface is found highest for 9  angle of attack. Experimental results, with or without Titanium nitride(TiN) nano-coating, also revealed that surface roughness augments with increasing impingement angles. Nano-coating (TiN) by RF sputtering technique reduced the surface roughness significantly as oppose to uncoated samples. Highest roughness has been observed on uncoated blade surface collided with 0.3-0.69 mm diameter brown aluminium oxide particles.

scholarly journals Defect Monitoring of a Wind Turbine Blade Surface by using Surface Wave Damping

2017 ◽  
Vol 23 (1) ◽  
pp. 90-94
Author(s):  
Kyung-Hwan Kim ◽  
Young-Jin Yang ◽  
Hyun-Bum Kim ◽  
Hyung-Chan Yang ◽  
Jong-Hwan Lim ◽  
...  
Keyword(s):  
Surface Wave ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Blade Surface ◽  
Wave Damping

The Study of the Aerodynamic Force of Wind Turbine Blade by Using FLUENT and MATLAB

2011 ◽  
Vol 225-226 ◽  
pp. 794-797
Author(s):  
He Huang ◽  
Sheng Jun Wu ◽  
Zhuo Qiu Li ◽  
Jin Fan Fei
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Cross Section ◽  
Large Scale ◽  
Aerodynamic Force ◽  
Wind Turbine Blade ◽  
Wind Pressure ◽  
Solid Model ◽  
Blade Surface ◽  
Analytical Work

In this paper, large scale wind turbine blade has been taken for example and two harmful conditions have been chosen as the study targets. Taking a 25 m long wind turbine blade, its solid model is built in CAE. Then take advantage of Computational Fluid Dynamics software-FLUENT to analyze and simulate wind pressure of blade surface acted by aerodynamic force. By means of the numerical method to make curve fitting to bring wind pressure to bear on each cross section of blade accurately, and import it into ANSYS to do further analytical work. It shows that the work should be the firm foundation for further analysis of the wind turbine blade.

scholarly journals Numerical Simulation of Surface Roughness Effects on Dynamic Stall of Wind Turbine Blade

2013 ◽  
Vol 7 (1) ◽  
pp. 32-48 ◽  
Author(s):  
Belkheir NOURA ◽  
Sofiane KHELLADI ◽  
Rabah DIZENE ◽  
Farid BAKIR
Keyword(s):  
Numerical Simulation ◽  
Surface Roughness ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Wind Turbine Blade ◽  
Dynamic Stall ◽  
Roughness Effects
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