Experimental Research on the Influence of Roughness on Water Film Flow

Zhao, Huanyu; Zhu, Chunling; Zhao, Ning; Zhu, Chengxiang; Wang, Zhengzhi

doi:10.3390/aerospace8080225

Cited by 3 publications

(2 citation statements)

References 20 publications

(18 reference statements)

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“…Figure 1 demonstrates the experimental system of the water film flow on the flat [16]. The air flowed into the experimental section of the wind tunnel after being rectified in the contraction section.…”

Section: Construction Of Measurement Systemmentioning

confidence: 99%

Experimental Research on the Fluctuation Characteristics of Water Film Driven by Wind

et al. 2022

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A series of experimental studies were conducted to explore the fluctuation characteristics of the water film under the air flow condition with the research background of the anti-icing system. The dynamic measurement of the water film on the surface of the aluminum-based plate was achieved using the digital image projection measurement technology. The influence of diverse wind speeds and Reynolds numbers on the average water film thickness, fluctuation intensity, and velocity of the liquid film was analyzed. The piecewise characteristics of the wind speed and Reynolds number for the fluctuation characteristics of the water film were analyzed innovatively. The fluctuation characteristics and formation principle of each stage were also examined. The results had a significant impact on establishing and modifying the mesoscopic models of aircraft icing to improve the design methodology of the anti-icing process.

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Section: Construction Of Measurement Systemmentioning

confidence: 99%

Experimental Research on the Fluctuation Characteristics of Water Film Driven by Wind

et al. 2022

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“…According to Equation (45) and the experimental summary of Zhao et al [23], the relationships between the Reynolds number and the average thickness of the water film and those between the Reynolds number and the interfacial shear coefficient were obtained for different roughness values, as shown in Figure 4. Based on the expression shown in Figure 4b, one can assume that…”

Section: Roughness Modelmentioning

confidence: 99%

Simulation of and Experimental Research on Rivulet Model on Airfoil Surface

Lou

Shen

et al. 2022

Aerospace

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The occurrence of aircraft icing can significantly affect flight performance. One of the most important aspects in the study of anti-icing technology for aircraft is the distribution of overflow water. Owing to the external airflow pressure, shear stress, and surface tension, the water film breaks up to form steady rivulets. Experiments on NACA0012 airfoil surfaces were conducted based on an open straight-flow and low-speed wind tunnel. Simultaneously, an engineered three-dimensional rivulet model considering the surface roughness was established based on the energy-minimum principle. A comparison between the simulation and experimental results shows that the errors in the water film breakup location and the flow velocity of rivulets are less than 20%, and the errors in the spacing and width of rivulets are less than 40%. In addition, the effects of surface temperature and uniform roughness on water film breakup were investigated. Furthermore, the rivulet model was applied to the numerical calculation of the thermal performance of hot-air anti-icing systems. The simulations reveal that the uniform roughness of the wing surface causes the water film to break earlier. As the surface roughness increases, the thickness, spacing, and width of the rivulets increase, and the rivulet flow velocity decreases.

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Research on the Methods for Obtaining Droplet Impingement Characteristics in the Lagrangian Framework

Shen,

Xiao,

Ning

et al. 2024

Aerospace

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The impact of supercooled water droplets is the cause of aircraft icing, and the acquisition of impingement characteristics is the key to icing prediction and the design of ice protection systems. The introduction of water droplet collection efficiency is required to obtain the characteristics for the Lagrangian method. In this work, a traditional flow tube method, a local flow tube method, and a statistical method are established to calculate the local collection efficiency, based on Lagrangian droplet trajectories. Through the numerical simulations of the air–droplet flow field around an NACA 0012 airfoil, the accuracies of the three methods in regard to collection efficiency are verified. Then, these three methods are applied to obtain the results for water droplet trajectories and the collection efficiency of an S-shaped duct, a 2D engine cone section and an icing wind tunnel. The results show that the distributions of water droplet collection efficiency obtained by the three methods are consistent and the three methods are all feasible when the water droplets do not overlap or cross before hitting the aircraft surfaces. When the water droplets are shadowed by upstream surfaces or blown by air injection, the droplet trajectories might overlap or even cross, and the local collection efficiencies obtained by the traditional flow tube method, local flow tube method, and statistical method might differ. The statistical method is relatively accurate. However, not all the droplet impingement characteristics obtained by the three methods are different due to these effects, and the non-crossing of the droplet trajectories is not a necessary condition for the use of the flow tube method. The effects of trajectory crossings are analyzed and discussed in detail in different situations for the three methods. This work is helpful for understanding and accurately calculating the droplet impingement characteristics and is of great significance for simulations of the aircraft icing process and anti/de-icing range.

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Experimental Research on the Influence of Roughness on Water Film Flow

Cited by 3 publications

References 20 publications

Experimental Research on the Fluctuation Characteristics of Water Film Driven by Wind

Experimental Research on the Fluctuation Characteristics of Water Film Driven by Wind

Simulation of and Experimental Research on Rivulet Model on Airfoil Surface

Research on the Methods for Obtaining Droplet Impingement Characteristics in the Lagrangian Framework

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