Water droplet deformation and breakup in the vicinity of the leading edge of an incoming airfoil

García, Adelaida García Magariño

doi:10.20868/upm.thesis.44231

Cited by 2 publications

(1 citation statement)

References 83 publications

(174 reference statements)

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“…It is important to note that MVD, LWC and TAT parameters define when aircraft icing is likely to occur [38,39]. For the icing phenomenon to happen, the ideal limits are the following: total air temperature from 0 • C to −10 • C, median volumetric diameter greater than 10 µm, and liquid water content greater than 0.5 g/m 3 .…”

Section: Initial Considerationsmentioning

confidence: 99%

Contributions to Image Transmission in Icing Conditions on Unmanned Aerial Vehicles

Rodríguez Marco,

Sánchez Rubio,

Martínez Herráiz

et al. 2023

Drones

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In terms of manned aircraft, pilots usually detect icing conditions by visual cues or by means of ice detector systems. If one of these cues is seen by the crew or systems detect icing conditions, they have to apply the evasive procedure as defined within the aircraft flight manual (AFM). However, as regards unmanned aircraft, there are not pilots on board and, consequently, nobody can act immediately when icing conditions occur. This article aims to propose new techniques of sending information to ground which make possible to know the aircraft performance correctly in icing conditions. For this goal, three contributions have been developed for the unmanned aircraft Milano. Since icing conditions are characterized quantitatively by the droplet size, the liquid water content, and the total air temperature, when these parameters are between certain limits ice formation on aircraft may occur. As a result of these contributions, in that moment, high-quality images of the wing leading edge, tail leading edge and meteorological probes will be captured and sent to ground making possible that remote pilots or artificial intelligent (AI) systems can follow the appropriate procedures, avoid encounters with severe icing conditions and perform real-time decision making. What is more, as information security is becoming an inseparable part of data communication, it is proposed how to embed relevant information within an image. Among the improvements included are image compression techniques and steganography methods.

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Section: Initial Considerationsmentioning

confidence: 99%

Contributions to Image Transmission in Icing Conditions on Unmanned Aerial Vehicles

Rodríguez Marco,

Sánchez Rubio,

Martínez Herráiz

et al. 2023

Drones

View full text Add to dashboard Cite

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Aerodynamic interaction of rain and wind turbine blades: the significance of droplet slowdown and deformation for leading-edge erosion

Barfknecht,

von Terzi

2024

Wind Energ. Sci.

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Abstract. Leading-edge rain erosion is a severe problem in the wind energy community since it leads to blade damage and a reduction in annual energy production by up to a few percent. The impact speed of rain droplets is a key driver of the erosion rate; therefore, its precise computation is essential. This study investigates the aerodynamic interaction of rain droplets and wind turbine blades. Based on findings from the literature and an analysis of the relevant parameter space, it is found that the aerodynamic interaction leads to a reduction in the impact speed. Additionally, the rain droplets deform and break up as they approach the wind turbine blade. An existing Lagrangian particle model, developed for research in aircraft icing, is adapted, extended, and validated for leading-edge rain erosion to study the process in more detail. Results show that the droplet slowdown reduces predicted damage toward the tip of the blade by over 50 %. The model indicates that the aerodynamic blade interaction affects small droplets significantly more than large droplets. Due to this drop-size dependency, the damage accumulation is shifted toward higher-rain-intensity events. Additionally, the droplet impact speed is sensitive to the aerodynamic nose radius of the airfoil. Due to this sensitivity and its drop-size dependency, the slowdown effect provides interesting levers for erosion mitigation via blade design or operational adjustments. To conclude, the aerodynamic interaction between droplet and blade is non-negligible and needs to be taken into account in erosion lifetime models.

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Water droplet deformation and breakup in the vicinity of the leading edge of an incoming airfoil

Cited by 2 publications

References 83 publications

Contributions to Image Transmission in Icing Conditions on Unmanned Aerial Vehicles

Contributions to Image Transmission in Icing Conditions on Unmanned Aerial Vehicles

Aerodynamic interaction of rain and wind turbine blades: the significance of droplet slowdown and deformation for leading-edge erosion

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