Waterdrop impact modeling

Adler, William F.

doi:10.1016/0043-1648(95)07176-8

Cited by 63 publications

(37 citation statements)

References 3 publications

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“…Later numerical modelling take into account an assumed spherical geometry of 25 the droplet as well as the compliance of the target material (Adler 1995. These studies also show a pressure peak near the edge of the contact.…”

Section: Droplet Impact 30mentioning

confidence: 93%

“…Stress waves propagate from the impact site into the coated 10 composite (body waves) and along its surface (surface waves). Several stress components are active as functions of the time after the impact, the radial planar position and depth in the material (Woods 1968, Adler 1995. These stresses can activate different failure modes depending on the velocity of the impact, the size of the droplet and "the weakest link" in the leading edge structure.…”

Section: Impact Stresses Fracture and Fatiguementioning

confidence: 99%

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Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events

Bech¹,

Hasager²,

Bak³

2018

Preprint

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Abstract. Impact fatigue caused by collision with rain droplets, hail stones and other airborne particles, also known as rain erosion, is a severe problem for wind turbine blades. Each impact on the leading edge adds an increment to the accumulated damage in the material. After a number of impacts the leading edge material will crack. This paper presents and supports the hypothesis that the vast majority of the damage accumulated in the leading edge is imposed at extreme precipitation condition events, which occur during a very small fraction of the turbines operation life. By reducing the tip speed of the blades during 10 these events, the service life of the leading edges significantly increases from a few years to the full expected lifetime of the wind turbine. In the worst case at the cost of a negligible reduction of annual energy production (AEP) and in the best case with a significant increase in AEP.

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Section: Droplet Impact 30mentioning

confidence: 93%

Section: Impact Stresses Fracture and Fatiguementioning

confidence: 99%

Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events

Bech¹,

Hasager²,

Bak³

2018

Preprint

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“…The presented numerical results for the polyurethane coated surfaces [29,30] showed that the predicted stresses and strains remain well below the values that cause failure. Instead of brittle fracture or tearing it is hypothesized by Ref.…”

Section: Wear Mechanismmentioning

confidence: 95%

“…Instead of brittle fracture or tearing it is hypothesized by Ref. [29] that repeated large strains may lead to fatigue initiation as the nucleating mechanism for erosion damage. This is in line with high cycle surface fatigue as origin of the damage.…”

Section: Wear Mechanismmentioning

confidence: 99%

Leading edge erosion of coated wind turbine blades: Review of coating life models

et al. 2015

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a b s t r a c tErosion of the leading edge of wind turbine blades by droplet impingement wear, reduces blade aerodynamic efficiency and power output. Eventually, it compromises the integrity of blade surfaces. Elastomeric coatings are currently used for erosion resistance, yet the life of such coatings cannot be predicted accurately. This review paper gives an overview of experimentally validated erosion model blocks that can be used to predict the life of the leading edge of coated wind turbine blades. From the reviewed work it is concluded that surface fatigue, as nucleating wear mechanism for erosion damage, can explain erosive wear and failure of the coatings. An engineering approach to surface fatigue, using the PalmgreneMiner rule for cumulative damage, allows for the construction of a rain erosion incubation period equation. Coating life was described as a function of the rain intensity, the droplet diameter, the fatigue properties of the coating and the severity of the conditions. It is recommended to focus coating development on reduction of the impact pressure, e.g. by developing surfaces with a low modulus of elasticity; or on enlarging the safe area by: developing coatings with adjustable compressive stresses and hardness, or coatings without defects and impurities.

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“…liquid and solid deformations were decoupled) and an artificial viscosity was used [5]. Adler [26,27] …”

Section: Previous Numerical Studies On Liquid-solid Impactmentioning

confidence: 99%

Analysis of water drop erosion on turbine blades based on a nonlinear liquid–solid impact model

Zhou¹,

Li²,

Chen³

et al. 2009

International Journal of Impact Engineering

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Waterdrop impact modeling

Cited by 63 publications

References 3 publications

Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events

Extending the life of wind turbine blade leading edges by reducing the tip speed during extreme precipitation events

Leading edge erosion of coated wind turbine blades: Review of coating life models

Analysis of water drop erosion on turbine blades based on a nonlinear liquid–solid impact model

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