Aerodynamic study of aerofoil and wing in simulated rain environment via a two-way coupled Eulerian-Lagrangian approach

Wu, Zhenlong; Cao, Yihua

doi:10.1017/s0001924000009416

Cited by 11 publications

(22 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The water film separates a sheet interacting with the airflow over the airfoil and deflecting the free-stream air up thus encouraging separation. According to published literature in the last decades, the following aspects has been investigated on the effects of rainfall on aircraft: aerodynamic performance degradation [48], raindrop trajectory [49], rain-affecting mechanisms, flight dynamic performance in heavy rain conditions [48,50], and surface water film flowing characteristics [51,52]. All these results are open studies on WT operation in rain conditions because the blade rotation makes a possibility of any rain direction for the airfoil surface.…”

Section: -5mentioning

confidence: 99%

See 1 more Smart Citation

Aerodynamic effect of icing/rain impacts on super-hydrophobic surfaces

Okulova

Taboryski

Sørensen

et al. 2018

AIP Conference Proceedings

View full text Add to dashboard Cite

The rain impact and ice accretion on different aerodynamic constructions represent a large problem to their safety and operation. Most current de-icing systems include either physical or chemical removal of ice, which is resource-and energy-intensive as well as environmentally polluting. A more desirable approach to prevent initial ice formation from water droplets on a surface is to employ highly ordered super-hydrophobic materials, which mimic lotus leaves and other natural dirt-and water-repelling surfaces and reproduced in many laboratory tests. The ability to fend off water droplets could lead to prevention of icing as an inherent material property, which further would prevent ice formations, rather than fighting its build-up. Our objective is to draw attention to problems of an extension of this effect to technical applications. The main idea of the icing or rain protection of the different aerodynamic constructions may be the use of superhydrophobic thermoplastic polymers with the water-repellent properties to prevent corrosion, improve aerodynamics or add self-cleaning properties to the material. The purpose of the present study is to explore the possibility of using a fast and cheap technology of R2R-EC to enable the fabrication of nanostructures on polymer foils of sizes ranging from 50 nanometers and up to 100 micrometers with the aim of improving the ice-cleaning and water-repellent properties of the coating. This high-speed and low-cost lithography method is developed at DTU and Danapak Flexibles A/S. These superhydrophobic surfaces with water-repelling structures provide rebound actions on the impacting droplets with the large contact angle θ. For the foils with the different micro-and nanostructures, the wetting properties are measured and impact with single droplet is presented. These coatings can be used for different engineering tasks, which need to establish and test new anti-icing/rain solutions for complex aerodynamic flows. We will start the present investigation from the initial point to include main aspects of the previous water-repellent investigations and test a single droplet impacts on the surface with the thermoplastic foil for the coating.

show abstract

Section: -5mentioning

confidence: 99%

“…The main influences of rain on aircraft, which also can play a critical role in WT operation: (a) surface erosion; (b) tracts of the raindrop; (c) vapor condensation; (d) streamlines under different conditions[48].…”

mentioning

confidence: 99%

Aerodynamic effect of icing/rain impacts on super-hydrophobic surfaces

Okulova

Taboryski

Sørensen

et al. 2018

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…The governing equations for water film can be referred to in our previous work. 9 In our work, we do not consider the energy issue, since the current flight is a low-speed movement (130 mile/h, about 58 m/s). With regard to this, convective heat transfer from water film to air, heat conduction from wall to water film and raindrop evaporation are not considered.…”

Section: Discrete Phasementioning

confidence: 99%

“…9 Regarding the improvement of the previous method, the dispersion of particles due to turbulence in the continuous phase is taken into consideration in this study by incorporating a random walk dispersion model. Both the individual and coupling effects of heavy rain and ice accretion on the aerodynamic performance of the airfoil are investigated.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of airfoil aerodynamic performance under the coupling effects of heavy rain and ice accretion

Cao

2016

Advances in Mechanical Engineering

View full text Add to dashboard Cite

It has been widely investigated before that both heavy rain and icing conditions can cause severe aerodynamic performance penalties to aircraft in flight; however, aircraft aerodynamics in the presence of both heavy rain and ice accretion has been little explored so far. In this article, a numerical simulation is performed to study the aerodynamic performance of an iced NACA 0012 airfoil in simulated heavy rain condition. A two-way momentum-coupled Eulerian-Lagrangian two-phase flow approach is developed to simulate raindrop trajectories in the airflow field. The analysis indicates that both rain and ice can separately cause severe aerodynamic performance degradation to the airfoil at most angles of attack of interest. In the presence of both ice and rain, a further severe aerodynamic penalty can be produced by rain based on the ice-induced aerodynamic performance degradation. Premature boundary-layer separation and boundarylayer momentum losses by splashed-back raindrops are also observed.

show abstract

“…3 For the basic flowfield simulations, the widely used Navier–Stokes flow governing equations are solved for the flowfields and aerodynamic characteristics of the baseline clean and iced NACA 23012 airfoils. For rain simulations, the two-way momentum coupled Eulerian–Lagrangian two-phase flow approach developed in our previous work 9,10 is adopted here. Difference is made with the turbulence model using the k–ω SST turbulence model 11 instead of the k–ɛ turbulence model.…”

Section: Introductionmentioning

confidence: 99%

Airfoil performance degradation by coupling effects of supercooled raindrop icing and heavy rainfall

Cao

2016

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

Icing and rainfall are the two critical meteorological factors that threaten the aircraft flight safety. A number of previous studies have shown their individual influences on aircraft aerodynamics; however, to date no studies on their coupling effects exist. In this paper, a numerical study is conducted to focus on the aerodynamic performance of a NACA 23012 airfoil exposed to heavy rain in the presence of an ice accretion by supercooled raindrop on the leading edge. An Eulerian–Lagrangian two-phase flow approach developed for rain simulation in our previous work is adopted here with some improvement in the turbulence model. A series of new phenomena about the aerodynamic performance and wake characteristics under the coupling effects of ice accretion and rainfall are found and discussed. These results do not seem to have been published previously and should be of significance to the aircraft industry for improved aircraft design and pilot training.

show abstract

Aerodynamic study of aerofoil and wing in simulated rain environment via a two-way coupled Eulerian-Lagrangian approach

Cited by 11 publications

References 28 publications

Aerodynamic effect of icing/rain impacts on super-hydrophobic surfaces

Aerodynamic effect of icing/rain impacts on super-hydrophobic surfaces

Numerical simulation of airfoil aerodynamic performance under the coupling effects of heavy rain and ice accretion

Airfoil performance degradation by coupling effects of supercooled raindrop icing and heavy rainfall

Contact Info

Product

Resources

About