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

Zhou, Qulan; Li, Na; Chen, Xi; Xu, Tongmo; Suo, Hui; Zhang, Di

doi:10.1016/j.ijimpeng.2009.02.007

Cited by 54 publications

(20 citation statements)

References 32 publications

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“…This question has been resolved by employing the fundamental assumptions and approach of 'Guided Acoustic Shock', as described in Lesser [9]. It has been shown, for the compressible stage of a highspeed droplet impingement, the effect of viscosity and surface tension are minimal and it is the inertial effects that drive the process [29,30]. By considering only the dominant physics and assuming the solid surface to be rigid, it has been possible to develop a simple relationship between the coefficient of the second-order term in the quadratic expression describing the form of the jet (the a in y = ax 2 ) and the radius of a droplet that would produce an 'equivalent' loading during the compressible stage.…”

Section: Theorymentioning

confidence: 99%

Water droplet erosion of aeroengine fan blades: The importance of form

Burson-Thomas

Wellman

Harvey

et al. 2019

Wear

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The radius of typical water droplet, which an aeroengine encounters in-service, and the radius of curvature of a typical fan blade leading-edge are approximately the same; this is unlike previously investigated contexts, where the typical droplet radius is at least an order of magnitude smaller. The consequences of this have been explored theoretically but never experimentally. In this study, an established technique was used to generate high-speed impingements (210 m s −1 to 250 m s −1) of water on planar and curved (in one plane) samples of a comparatively well-understood material (polymethylmethacrylate). A novel, direct, characterisation methodology (using ultra-high-speed imaging) was employed to accurately describe each impingement. The form of damage changed significantly when a curved sample was subjected to a high-speed impingement; the circular damage pattern observed on planar samples changed to an oval. This is qualitatively consistent with the theoretical predictions and constitutes another step forward in the understanding of the WDE of aeroengine fan blades.

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Section: Theorymentioning

confidence: 99%

Water droplet erosion of aeroengine fan blades: The importance of form

Burson-Thomas

Wellman

Harvey

et al. 2019

Wear

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“…These include crater formation 1 – 3 , solid state splashing 4 , impact bonding 5 , peculiar phase transformations 6 , nanocrystallization 7 , and chemical reactions 8 . Among the most extreme of such phenomena lies impact-induced erosion that often occurs at the micron scale whether in space 9 , on the ground 10 , or beneath 11 . At the micron scale, metallic microparticles change their interaction with metallic targets as impact velocity increases.…”

Section: Introductionmentioning

confidence: 99%

Melt-driven erosion in microparticle impact

et al. 2018

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Impact-induced erosion is the ablation of matter caused by being physically struck by another object. While this phenomenon is known, it is empirically challenging to study mechanistically because of the short timescales and small length scales involved. Here, we resolve supersonic impact erosion in situ with micrometer- and nanosecond-level spatiotemporal resolution. We show, in real time, how metallic microparticles (~10-μm) cross from the regimes of rebound and bonding to the more extreme regime that involves erosion. We find that erosion in normal impact of ductile metallic materials is melt-driven, and establish a mechanistic framework to predict the erosion velocity.

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“…Along with the development of fractal geometry theory, the fractal theory was gradually used to study the particle size distributions [21,27,28]. However, coal fragmentation under water jet impact loading in WJD is a very complicated process because of the hydromechanical coupling effect, which makes coal breakage different from other impact failure patterns [29][30][31]. Thus, it is worth investigating the coal fragmentation features in order to provide the basis for further research on the coal fragments transportation in WJD.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Coal Fragmentation by High-Velocity Water Jet in Drilling: Size Distributions and Fractal Characteristics

Xiao

et al. 2018

Applied Sciences

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Water jet drilling (WJD) technology is a highly efficient method to extract coalbed methane from reservoirs with low permeability. It is crucial to efficiently remove the coal fragments while drilling. In this study, to disclose coal fragmentation features and size distributions under water jet impact in drilling, the image processing method was utilized to obtain the geometric dimensions of coal fragments. The size distributions, morphologies and fractal characteristics of coal fragmentation were studied based on generalized extreme value distribution and fractal theory. The effects of the jet impact velocity and coal strength on the fragmentation features were analyzed. The results show that fine particles dominate the coal fragments in WJD for coal seams with various strengths. In experiments conducted at the Fengchun coal mine, owing to the higher coal strength of the M7 coal seam, the fragmentation degree of coal subjected to water jets during WJD is lower in the M7 coal steam than in the M8 coal seam, which results in a large dominant fragment size and small fractal dimension under the same impact energy. It was found that the higher the jet impact velocity is, the higher the quantity of fragments generated from WJD and the smaller the particle size. The NUM-based cumulative probability distribution curves of coal fragments are more intensive in the range of relatively small particle sizes and then become sparser with the increase in particle size. When the impact velocity increases, (i) the size distribution curves move toward smaller particle sizes, and the dominant fragment size decreases; (ii) the shape (major axis/minor axis) of coal fragments move toward the upper left, and the curve shape for a high impact velocity attains unity more quickly; and (iii) the fractal dimension value increases linearly. In addition, the fractal dimensions are obviously affected by the dominant fragment size; they increase with the decrease in the dominant fragment size. This study can provide a basis for further research on coal fragment transportation in WJD and parameter selection for discharging coal fragments during drilling for CBM development.

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

Cited by 54 publications

References 32 publications

Water droplet erosion of aeroengine fan blades: The importance of form

Water droplet erosion of aeroengine fan blades: The importance of form

Melt-driven erosion in microparticle impact

Investigation on Coal Fragmentation by High-Velocity Water Jet in Drilling: Size Distributions and Fractal Characteristics

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