scholarly journals Mechanism of Water Droplet Breakup near the Leading Edge of an Airfoil

2012 ◽  
Author(s):  
Mario Vargas ◽  
Suthyvann Sor ◽  
Adelaida García Magariño
Keyword(s):  
Water Droplet ◽  
Leading Edge ◽  
Droplet Breakup

scholarly journals Mechanism of Supercooled Water Droplet Breakup near the Leading Edge of an Airfoil

2017 ◽  
Author(s):  
Belen Veras-Alba ◽  
Jose Palacios ◽  
Mario M. Vargas ◽  
Charles R. Ruggeri ◽  
Tadas P. Bartkus
Keyword(s):  
Water Droplet ◽  
Leading Edge ◽  
Supercooled Water ◽  
Droplet Breakup

Experimental Investigation of Supercooled Water Droplet Breakup near Leading Edge of Airfoil

2018 ◽  
Vol 55 (5) ◽  
pp. 1970-1984 ◽  
Author(s):  
Belen Veras-Alba ◽  
Jose Palacios ◽  
Mario Vargas ◽  
Charles Ruggeri ◽  
Tadas P. Bartkus
Keyword(s):  
Experimental Investigation ◽  
Water Droplet ◽  
Leading Edge ◽  
Supercooled Water ◽  
Droplet Breakup

scholarly journals Water Droplet Erosion of Wind Turbine Blades: Mechanics, Testing, Modeling and Future Perspectives

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 157 ◽  
Author(s):  
Mohamed Elhadi Ibrahim ◽  
Mamoun Medraj
Keyword(s):  
Wind Turbine ◽  
Water Droplet ◽  
Prediction Models ◽  
Experimental Testing ◽  
Turbine Blades ◽  
Leading Edge ◽  
Droplet Impact ◽  
Wind Turbine Blades ◽  
Water Droplet Erosion ◽  
Erosion Prediction

The problem of erosion due to water droplet impact has been a major concern for several industries for a very long time and it keeps reinventing itself wherever a component rotates or moves at high speed in a hydrometer environment. Recently, and as larger wind turbine blades are used, erosion of the leading edge due to rain droplets impact has become a serious issue. Leading-edge erosion causes a significant loss in aerodynamics efficiency of turbine blades leading to a considerable reduction in annual energy production. This paper reviews the topic of water droplet impact erosion as it emerges in wind turbine blades. A brief background on water droplet erosion and its industrial applications is first presented. Leading-edge erosion of wind turbine is briefly described in terms of materials involved and erosion conditions encountered in the blade. Emphases are then placed on the status quo of understanding the mechanics of water droplet erosion, experimental testing, and erosion prediction models. The main conclusions of this review are as follow. So far, experimental testing efforts have led to establishing a useful but incomplete understanding of the water droplet erosion phenomenon, the effect of different erosion parameters, and a general ranking of materials based on their ability to resist erosion. Techniques for experimentally measuring an objective erosion resistance (or erosion strength) of materials have, however, not yet been developed. In terms of modelling, speculations about the physical processes underlying water droplet erosion and consequently treating the problem from first principles have never reached a state of maturity. Efforts have, therefore, focused on formulating erosion prediction equations depending on a statistical analysis of large erosion tests data and often with a combination of presumed erosion mechanisms such as fatigue. Such prediction models have not reached the stage of generalization. Experimental testing and erosion prediction efforts need to be improved such that a coherent water droplet erosion theory can be established. The need for standardized testing and data representation practices as well as correlations between test data and real in-service erosion also remains urgent.

Droplet Breakup Criterion in Airfoils Leading Edge Vicinity

2018 ◽  
Vol 55 (5) ◽  
pp. 1867-1876 ◽  
Author(s):  
Adelaida Garcia-Magariño ◽  
Suthyvann Sor ◽  
Angel Velazquez
Keyword(s):  
Leading Edge ◽  
Droplet Breakup

Importance of Surface Curvature in Modeling Droplet Impingement on Fan Blades

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Charles B. Burson-Thomas ◽  
Richard Wellman ◽  
Terry J. Harvey ◽  
Robert J. K. Wood
Keyword(s):  
Water Droplet ◽  
High Pressures ◽  
Flat Surface ◽  
Leading Edge ◽  
Droplet Radius ◽  
Radius Of Curvature ◽  
Asymmetric Flow ◽  
Droplet Impingement ◽  
Fan Blade ◽  
Flow Stage

When modeling a droplet impingement, it is reasonable to assume a surface is flat when the radius of curvature of the surface is significantly larger than the droplet radius. In other contexts where water droplet erosion (WDE) has been investigated, the typical droplet size has either been sufficiently small, or the radius of curvature of the surface sufficiently large, that it has been sensible to make this assumption. The equations describing the kinematics of an impinging water droplet on a flat surface were reformulated for a curved surface. The results suggest the relatively similar radii of curvature, of the leading-edge of a fan blade and the impinging water droplet, will significantly affect the application of the initial high-pressures, along with the onset of lateral outflow jetting. Jetting is predicted to commence substantially sooner and not in unison along the contact periphery, leading to an asymmetric flow stage. This is likely to have significant implications for the WDE that occurs, and thus, the engineering approaches to minimize the WDE of fan blades.

Importance of Surface Curvature in Modelling Droplet Impingement on Fan Blades

2018 ◽  
Author(s):  
Charles B. Burson-Thomas ◽  
Richard Wellman ◽  
Terry J. Harvey ◽  
Robert J. K. Wood
Keyword(s):  
Water Droplet ◽  
High Pressures ◽  
Flat Surface ◽  
Leading Edge ◽  
Droplet Radius ◽  
Radius Of Curvature ◽  
Asymmetric Flow ◽  
Droplet Impingement ◽  
Fan Blade ◽  
Flow Stage

When modelling a droplet impingement, it is reasonable to assume a surface is flat when the radius of curvature of the surface is significantly larger than the droplet radius. In other contexts where Water Droplet Erosion (WDE) has been investigated, the typical droplet size has either been sufficiently small, or the radius of curvature of the surface sufficiently large, that it has been sensible to make this assumption. The equations describing the kinematics of an impinging water droplet on a flat surface were reformulated for a curved surface. The results suggest the relatively similar radii of curvature, of the leading-edge of a fan blade and the impinging water droplet, will significantly affect the application of the initial high-pressures, along with the onset of lateral outflow jetting. Jetting is predicted to commence substantially sooner and not in unison along the contact periphery, leading to an asymmetric flow stage. This is likely to have significant implications for the WDE that occurs, and thus, the engineering approaches to minimise the WDE of fan blades.

scholarly journals Effect of water droplet breakup on hydrogen/air detonations

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Yong Xu ◽  
Majie Zhao ◽  
Huangwei Zhang
Keyword(s):  
Water Droplet ◽  
Droplet Breakup ◽  
Effect Of Water

scholarly journals Aircraft-Based Aerosol Sampling in Clouds: Performance Characterization of Flow-Restriction Aerosol Inlets

2014 ◽  
Vol 31 (11) ◽  
pp. 2512-2521 ◽  
Author(s):  
Lucas Craig ◽  
Arash Moharreri ◽  
David C. Rogers ◽  
Bruce Anderson ◽  
Suresh Dhaniyala
Keyword(s):  
Leading Edge ◽  
Cloud Droplet ◽  
Operating Conditions ◽  
Droplet Breakup ◽  
Design Parameters ◽  
Aerosol Sampling ◽  
Cloud Droplets ◽  
Flow Restriction ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Through

AbstractInteraction of liquid cloud droplets and ice particles with aircraft aerosol inlets can result in the generation of a large number of secondary particles and contaminate aerosol measurements. Recent studies have shown that a sampler designed with a perpendicular subsampling tube located within a flow-through conduit (i.e., a flow-restriction inlet) was best suited for in-cloud sampling. Analysis of field data obtained from different flow-restriction inlets shows that their critical cloud droplet breakup diameters are strongly dependent on design details and operating conditions. Using computational fluid dynamics (CFD) simulations, in-cloud sampling performance of a selected inlet can be predicted reasonably accurately for known operating conditions. To understand the relation between inlet design parameters and its sampling performance, however, CFD calculations are impractical. Here, using a simple, representative one-dimensional velocity profile and a validated empirical droplet breakup criteria, a parametric study is conducted to understand the relationship between different inlet design features and operating conditions on its critical breakup diameters. The results of this study suggest that an optimal inlet for in-cloud aerosol sampling should have a combination of a restriction nozzle at the aft end of the flow-through conduit to minimize wall-impaction shatter artifacts and a blunt leading edge to minimize shatter artifact generation from the aerodynamic breakup of cloud droplets. Inlets for in-cloud aerosol sampling from aircraft will, therefore, differ significantly in design from those used for clear-air aerosol sampling.

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