Stress Wave Propagation in a Coated Elastic Half-Space due to Water Drop Impact

Kim, Hyun‐Sil; Kim, Jae‐Seung; Kang, Hyunju; Kim, Sang-Ryul

doi:10.1115/1.1352060

Cited by 6 publications

(8 citation statements)

References 5 publications

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“…The second type is that, after the impact pressure is obtained from the analytical or approximate solutions, the pressure distribution is decomposed to point loads [13,28]. Next, the longitudinal wave and transverse wave arising from such point loads are analyzed.…”

Section: Previous Models In Solid Regionmentioning

confidence: 99%

“…model to describe the impact of a water drop (with 2 mm diameter and impact speed 305 m/s) on a solid, however the formation of shock wave was not shown. Stress wave propagation in a coated elastic specimen due to water drop impact was given in [28] based on the model established in [12], and again the solid-liquid interaction was absent. Haller [29] investigated the fluid dynamics of water drop (with 200 mm diameter and impact speed 500 m/s) impact on a rigid substrate.…”

Section: Liquid Regionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Previous Models In Solid Regionmentioning

confidence: 99%

Section: Liquid Regionmentioning

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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“…In Ref. [24] reflection at the coatingesubstrate interface is taken into account as well. Calculations are made with a water droplet diameter d d ¼ 2 mm, a droplet impact velocity v d ¼ 453 m/s and a 90 impact angle.…”

Section: Introductionmentioning

confidence: 99%

“…Table 1 summarizes the other input parameters of the calculations made in Ref. [24]. The water hammer pressure is used to normalize the stresses to nondimensional numbers.…”

Section: Introductionmentioning

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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“…14,15) Along previous analytical attempts, many researchers established simple models upon liquid-rigid surface interaction (many of them are 1D) and obtained the steady-state pressure, [16][17][18][19] and then applied that pressure to obtain stress characteristics in an elastic half-space. 16,17,[20][21][22][23] Apparently, in these works, the pressure field in liquid was not simultaneously coupled with the stress wave in solid, the solutions were not valid for the realistic 3D condition, and the transient peak pressure in liquid and peak stress in solid, which are much more severe than the steady-state values, 15) were not pursued.…”

Section: Fundamental Considerations Of Modelingmentioning

confidence: 99%

Water Drop Erosion on Turbine Blades: Numerical Framework and Applications

Zhou

Chen

et al. 2008

Mater. Trans.

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When small droplets are formed in the wet steam stage of a steam turbine, they may impact the blade surface at a high velocity and repetitive impacts cause water drop erosion, which emerges as one of the primary reliability concerns of the turbine. We propose an effective numerical framework that couples fluid mechanics with solid mechanics. The movements of water drops in a blade channel are analyzed based on the solution of the flow field of water steam in turbine, and impact statistics such as impact frequency, velocity, and position are obtained as the working condition and particle size are varied. A nonlinear wave model is established for high velocity liquid-solid impact, from which the characteristic impact pressure in liquid and peak impact stress in solid are obtained; the solutions are then superimposed with the pathways of water particles, and a fatigue analysis is carried out to elucidate the mechanisms of water drop erosion. The lifetime map on a blade surface with two different materials (1Cr13 and Ti-6Al-4V) under typical working conditions are obtained, in terms of operation hours, and the most dangerous water drop erosion regions and operating conditions of the steam turbine are deduced.

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Stress Wave Propagation in a Coated Elastic Half-Space due to Water Drop Impact

Cited by 6 publications

References 5 publications

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

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

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

Water Drop Erosion on Turbine Blades: Numerical Framework and Applications

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