Analysis of leading edge erosion effects on turbulent flow over airfoils

Ravishankara, Akshay Koodly; Özdemir, Hüseyin; Weide, Edwin van der

doi:10.1016/j.renene.2021.03.021

Cited by 16 publications

(3 citation statements)

References 21 publications

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“…Computational Fluid Dynamics (CFD) is also extensively used to assess the detrimental effects of LEE at the high Reynolds numbers of the outboard blade sections of utility-scale turbines. A simple approach to account for the effects of roughness consists of using a distributed wall roughness model applied to the nominal airfoil geometry [26]. This approach may account for the impact of distributed roughness due to moderate erosion on anticipating or suppressing BL transition and increasing surface drag of turbulent BLs.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Progression of Wind Turbine Energy Yield Losses Due to Blade Erosion by Resolving Damage Geometries from Lab Tests and Field Observations

Castorrini¹,

Ortolani

Campobasso

2023

Preprint

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Section: Introductionmentioning

confidence: 99%

Assessing the Progression of Wind Turbine Energy Yield Losses Due to Blade Erosion by Resolving Damage Geometries from Lab Tests and Field Observations

Castorrini¹,

Ortolani

Campobasso

2023

Preprint

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“…Their results validated that when the erosion depth was constant, the increase in erosion thickness could lead to flow separation at the leading edge and trailing edge. Ravishankara et al [11] implemented roughness models in a different turbulence model, and the various integral boundary layer quantities in the presence of erosion roughness were investigated using this model. Cappugi et al [12] presented a simulation-based technology that could rapidly and accurately estimate the wind turbine energy field losses due to blade leading-edge erosion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Types of Erosion on the Aerodynamic Performance of Wind Turbine Airfoils

et al. 2022

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Taking the S823 airfoil as the research object, this study investigates the influence of different types of leading-edge erosion on the aerodynamic performance of airfoil by using the computational fluid dynamics method. The effect of leading-edge erosion on the inception of stall vortex is also analysed. The results show that when the angle of attack (AoA) is greater than 5°, the leading-edge erosion results in a significant decrease in the lift coefficient and an increase in the drag coefficient. The deterioration in the drag coefficient of the airfoil caused by leading-edge erosion is much greater than that of the lift coefficient. Moreover, the maximum promotion rate of the drag coefficient can reach 357% at Re = 300,000. The exacerbation of the erosion level leads to a dramatic expansion of the stall vortex on the airfoil suction side at a large AoA and results in a reduction in the pressure difference between the pressure and suction sides of the airfoil. This is also the reason erosion causes the degradation of the aerodynamic performance of the wind turbine airfoil. This work is beneficial to establish the reasonable maintenance cycle of the wind turbine blades working in a sand blown environment.

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“…Leading edge erosion (LEE) is an emerging issue in wind turbine blade reliability [1]. Erosion of the leading edge causes gradual degradation of aerodynamic performance resulting in loss of annual energy production (AEP) [2][3][4]. While there is uncertainty regarding the response relationship between the severity of LEE and AEP losses [4,5], roughening of the blade leading edge reduces aerodynamic performance at roughness heights of 0.1 mm or below [6].…”

Section: Introduction 1wind Turbine Blade Leading Edge Erosionmentioning

confidence: 99%

Atmospheric Drivers of Wind Turbine Blade Leading Edge Erosion: Review and Recommendations for Future Research

et al. 2022

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Leading edge erosion (LEE) of wind turbine blades causes decreased aerodynamic performance leading to lower power production and revenue and increased operations and maintenance costs. LEE is caused primarily by materials stresses when hydrometeors (rain and hail) impact on rotating blades. The kinetic energy transferred by these impacts is a function of the precipitation intensity, droplet size distributions (DSD), hydrometeor phase and the wind turbine rotational speed which in turn depends on the wind speed at hub-height. Hence, there is a need to better understand the hydrometeor properties and the joint probability distributions of precipitation and wind speeds at prospective and operating wind farms in order to quantify the potential for LEE and the financial efficacy of LEE mitigation measures. However, there are relatively few observational datasets of hydrometeor DSD available for such locations. Here, we analyze six observational datasets from spatially dispersed locations and compare them with existing literature and assumed DSD used in laboratory experiments of material fatigue. We show that the so-called Best DSD being recommended for use in whirling arm experiments does not represent the observational data. Neither does the Marshall Palmer approximation. We also use these data to derive and compare joint probability distributions of drivers of LEE; precipitation intensity (and phase) and wind speed. We further review and summarize observational metrologies for hydrometeor DSD, provide information regarding measurement uncertainty in the parameters of critical importance to kinetic energy transfer and closure of data sets from different instruments. A series of recommendations are made about research needed to evolve towards the required fidelity for a priori estimates of LEE potential.

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Analysis of leading edge erosion effects on turbulent flow over airfoils

Cited by 16 publications

References 21 publications

Assessing the Progression of Wind Turbine Energy Yield Losses Due to Blade Erosion by Resolving Damage Geometries from Lab Tests and Field Observations

Assessing the Progression of Wind Turbine Energy Yield Losses Due to Blade Erosion by Resolving Damage Geometries from Lab Tests and Field Observations

Effect of Different Types of Erosion on the Aerodynamic Performance of Wind Turbine Airfoils

Atmospheric Drivers of Wind Turbine Blade Leading Edge Erosion: Review and Recommendations for Future Research

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