An experimental study of surface wettability effects on dynamic ice accretion process over an UAS propeller model

Liu, Yang; Li, Linkai; Hu, Hui

doi:10.1016/j.ast.2017.12.003

Cited by 89 publications

(35 citation statements)

References 38 publications

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“…One example of passive anti-icing/deicing systems is superhydrophobic coating. These coatings, which have a high degree of water repellency, displayed a low adhesion property, thus proficient at removing/mitigating ice [7][8][9][10][11][12][13][14][15][16][17][18][19]. In addition to being icephobic, one of the main issues hindering the large-scale use of superhydrophobic surfaces is their poor mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

Reducing Static and Impact Ice Adhesion with a Self-Lubricating Icephobic Coating (SLIC)

Tetteh

Loth

2020

Coatings

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Ice accumulation and adhesion can problematically occur on many engineering systems, such as electrical power networks, wind turbines, communication towers, and aircraft. An optional solution to these icing problems is the use of surfaces/coatings with low ice adhesion properties: Icephobic surfaces. Icephobic surfaces/coatings are very beneficial, as they facilitate the removal of ice or retard its formation and do not require the use of any sort of energy. A compact icing research tunnel (CIRT) was employed to measure ice tensile adhesion strength for both impact and static ice on a conventional metal surface (aluminum) and on a Self-Lubricating Icephobic Coating (SLIC) surface. The static ice consisted of deionized water slowly poured over the surface and left to be frozen on the test specimen surface at stationary conditions, while impact ice consisted of droplets of mean volumetric diameter (MVD) of 13 μm impacting the test specimen surface at a velocity of 40 m/s and freezing and accreting dynamically. The results revealed that static ice has an ice tensile adhesion stress higher than that of impact ice for the conditions used, consistent with previous studies. Additionally, a reduction of more than half was observed in ice tensile adhesion stress for SLIC compared to aluminum for both impact and static ice, and this performance stayed consistent even after multiple icing tests on the same sample. The SLIC coating hydrophobicity (roll-off angle and contact angle) also demonstrated resilience to icing and mechanical abrasion, confirming the self-healing properties.

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Section: Introductionmentioning

confidence: 99%

Reducing Static and Impact Ice Adhesion with a Self-Lubricating Icephobic Coating (SLIC)

Tetteh

Loth

2020

Coatings

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“…Over the years, a number of anti-/de-icing systems (including both active and passive methods) have been developed for aircraft icing mitigation. While most of active anti-/de-icing methods require energy expenditure [9] or the use of deicer chemicals [10], passive anti-icing strategies are mainly dependent on the utilization of specialized hydro-and ice-phobic coatings/materials [11][12][13][14][15][16]. Although the goal of reducing/preventing ice accretion on the surfaces of airplanes has been achieved by using these techniques, they are suffering from various drawbacks.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the thermal characteristics of NS-DBD plasma actuation and application for aircraft icing mitigation

Liu

Kolbakir

Starikovskiy

et al. 2019

Plasma Sources Sci. Technol.

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A comprehensive study was performed to explore the thermal characteristics of NS-dielectric-barrier discharge (DBD) plasma actuation over an airfoil/wing surface and evaluate the anti-/de-icing performance of NS-DBD plasma actuators for aircraft in-flight icing mitigation. While the fundamentals of thermal energy generation and heat transfer in NS-DBD plasma actuation over the airfoil/wing model were described in great details, a series of experiments were conducted to evaluate the effects of different environmental parameters on the heating efficiency of NS-DBD plasma actuators over the airfoil/wing surface. With the temporally-synchronized-and-spatiallyresolved high-speed visualization and infrared imaging system, not only the transient thermal characteristics of NS-DBD plasma actuation over the airfoil/wing surface were revealed, but also the anti-icing performances of the NS-DBD plasma actuators were evaluated under different icing conditions, i.e. rime, mixed, and glaze. The impacts of incoming airflow velocity, air temperature, and angle of attack of the airfoil/wing model on the thermal characteristics of NS-DBD plasma actuation over the airfoil/wing surface were systematically investigated based on the measurement results. It was found that the thermal characteristics of NS-DBD plasma actuation over the airfoil/ wing surface are closely coupled with the boundary layer airflow and the unsteady heat transfer process over the airfoil/wing model exposed in the frozen-cold airflows. The anti-icing performances of the NS-DBD plasma actuators under the different icing conditions were found to be varying significantly due to the variations of surface heating efficiency of the NS-DBD plasma actuators. The anti-/de-icing performance of the NS-DBD plasma actuators was found to be improved dramatically by increasing the operating frequency of the plasma actuators. The findings derived from the present study are very helpful to explore/optimize design paradigms for the development of novel plasma-based anti-/de-icing strategies tailored specifically for aircraft inflight icing mitigation to ensure safer and more efficient aircraft operation in atmospheric icing conditions.

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“…In comparison, recent work on propeller ice accretion [26,27] is limited to quantitative descriptions. Thus, accretion on airfoils is better understood than that on propellers.…”

Section: Icing Dynamics: Accretion and Sheddingmentioning

confidence: 99%

Detection and Isolation of Propeller Icing and Electric Propulsion System Faults in Fixed-Wing UAVs

Haaland

Wenz

Gryte

et al. 2021

2021 International Conference on Unmanned Aircraft Systems (ICUAS)

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This thesis presents a fault detection and isolation (FDI) framework for detecting propeller icing, and other propulsion faults of unmanned aerial vehicles (UAVs). Such faults are among the main causes for incidents and loss of equipment.A theoretical framework for the proposed FDI is covered extensively. A tuning methodology and an implementation guide are also covered in detail. The method has been tested extensively using a software-in-the-loop simulator. The simulation results have proven to be very successful and this motivates future testing on real data sets. Relation to previous work This is a disclaimer about what is new in this thesis and what has been borrowed or reused. Project workThere will be some content-overlap between this thesis and the project work from the fall of 2020. The project work will be quoted in the relevant parts.Many of the core FDI ideas were developed during the project work. The main contribution of the project work was an in-depth analysis of those ideas. The analysis was aimed at limitations and possibilities. The project left off with a non-functioning method, with many open ends. This thesis presents a refined solution.Software documentation is also covered in this thesis. The software project was started during the project work. This was not documented in the project work. By then most of the code has been refactored many times over. Further, the main data structures were developed after the project work. The project work is therefore not quoted in the software section (7). Previous work by othersThis project builds on previous projects at NTNU. Most prominent is the use of the Ardupilot-Simulink simulator. Much of the simulator was developed by A. W. Wenz, K. Gryte, A. Winter and T. A. Johansen. The simulator is described in Section 5. My contribution to the simulator was the fault dynamics and the aircraft speed control. Some of the core ideas were originally from A. W. Wenz. Wenz never published these ideas, but the ideas are present in the project work. Thus, Wenz is credited through the project work citations.

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An experimental study of surface wettability effects on dynamic ice accretion process over an UAS propeller model

Cited by 89 publications

References 38 publications

Reducing Static and Impact Ice Adhesion with a Self-Lubricating Icephobic Coating (SLIC)

Reducing Static and Impact Ice Adhesion with a Self-Lubricating Icephobic Coating (SLIC)

An experimental study on the thermal characteristics of NS-DBD plasma actuation and application for aircraft icing mitigation

Detection and Isolation of Propeller Icing and Electric Propulsion System Faults in Fixed-Wing UAVs

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