Corrosion Mechanism on Offshore Wind Turbine Blade in Salt Fog Environment

Dong, Xiao Hui; Yuan, Tie Jun; Hong, Ru

doi:10.4028/www.scientific.net/amm.432.258

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…Critical wind turbine components (e.g., generators, transformers, rotors, and turbine blades) degrade over time due to normal usage and the influence of their ambient operating environment. For example, it is well known that ocean air is corrosive to wind turbine blades due to its higher salt content [22]. In what follows, the phrase "turbine degradation" refers to the degradation of a single, critical component whose replacement requires substantial time, effort, and resources.…”

Section: Degradation Modelmentioning

confidence: 99%

Structured Replacement Policies for Offshore Wind Turbines

Soltani,

Kharoufeh,

Khademi

2023

Prob. Eng. Inf. Sci.

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We consider the problem of optimally maintaining an offshore wind farm in which major components progressively degrade over time due to normal usage and exposure to a randomly varying environment. The turbines exhibit both economic and stochastic dependence due to shared maintenance setup costs and their common environment. Our aim is to identify optimal replacement policies that minimize the expected total discounted setup, replacement, and lost power production costs over an infinite horizon. The problem is formulated using a Markov decision process (MDP) model from which we establish monotonicity of the cost function jointly in the degradation level and environment state and characterize the structure of the optimal replacement policy. For the special case of a two-turbine farm, we prove that the replacement threshold of one turbine depends not only on its own state of degradation but also on the state of degradation of the other turbine in the farm. This result yields a complete characterization of the replacement policy of both turbines by a monotone curve. The policies characterized herein can be used to optimally prescribe timely replacements of major components and suggest when it is most beneficial to share costly maintenance resources.

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Section: Degradation Modelmentioning

confidence: 99%

Structured Replacement Policies for Offshore Wind Turbines

Soltani,

Kharoufeh,

Khademi

2023

Prob. Eng. Inf. Sci.

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“…In the first case, this is due to technological factors in setting up and organizing the production process. Whereas, in the second, it is associated with the corrosion process [34] or depositions on surface. That is especially an issue for offshore wind turbines, where the blades are in a salt fog environment.…”

Section: Introductionmentioning

confidence: 99%

Hot-Wire Investigation of Turbulence Topology behind Blades at Different Shape Qualities

et al. 2022

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The scope of this paper is to perform a detailed experimental investigation of the shape error effect on the turbulence evolution behind NACA 64-618 airfoil. This airfoil is 3D-printed with predefined typical shape inaccuracies. A high-precision optical 3D scanner was used to assess the shape and surface quality of the manufactured models. The turbulent flow was studied using hot-wire anemometry. The developed force balance device was provided to measure the aerodynamic characteristics of the airfoil. Experimental studies were carried out for three angles of attack, +10∘, 0∘, −10∘, and different chord-based Reynolds numbers from 5.3×104 to 2.1×105. The obtained results show that the blunt trailing edge and rough surface decline the aerodynamic performance of the blades. In addition, the experimental results revealed a strong sensitivity of the Taylor microscale Reynolds number to the type of shape inaccuracy, especially at Re≈1.7×105. We also discuss the evolution of the Reynolds stress components, the degree of flow anisotropy, and the power spectrum distributions depending on the airfoil inaccuracies.

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“…Corrosion in an OWT has been observed at different locations and it has to be specified that there are various corrosion mechanisms existing. Different regions affected by corrosion can be broken down as listed below and further illustrated in thriving shown in Figure 1a,b [16][17][18] In a sealed structure, the dissolved oxygen is rapidly absorbed and the medium becomes anaerobic causing hydrogen sulphide to be released as a product of the new corrosion mechanism. Within a closed environment it is expected that this form of corrosion would be limited as the internal conditions would not continue to support the chemical reaction [15].…”

Section: Introductionmentioning

confidence: 99%

Profiling Corrosion Rates for Offshore Wind Turbines with Depth in the North Sea

Khodabux

Causon

2020

Energies

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Corrosion in the marine environment is a complex and expensive form of damage. It is commonly studied by the deployment of coupons that reflect the marine corrosion a structure will experience, thus allowing design and maintenance prevention strategies to be developed accordingly. This study stems from the lack of information in the literature regarding the profiling of corrosion with respect to marine depth in the North Sea where important wind farm developments have been undertaken. To address such issue a field experiment has been designed and carried out in the vicinity of the Westermost Rough Windfarm in the North Sea. The field experiment consists of deploying steel S355 coupons below the tidal area and capturing the effects of corrosion, the mass loss from which the corrosion rate is derived and the chemical products that makes up the rust with water depth. The study involves proper planning and logistics to ensure that the field experiment survives the rough conditions of the North Sea for a duration of 111 days. A high corrosion rate of 0.83 mm/year has been observed in this experiment. This paper goes into the details of the deployment blueprint employed and the analyses of the coupons to provide a conclusive observation and modelling of corrosion with respect to water depth under free or open sea water corrosion condition.

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Corrosion Mechanism on Offshore Wind Turbine Blade in Salt Fog Environment

Cited by 8 publications

References 6 publications

Structured Replacement Policies for Offshore Wind Turbines

Structured Replacement Policies for Offshore Wind Turbines

Hot-Wire Investigation of Turbulence Topology behind Blades at Different Shape Qualities

Profiling Corrosion Rates for Offshore Wind Turbines with Depth in the North Sea

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