Effects of Upstream Component and Air Injection on Water Droplet Impingement Characteristics for Downstream Surfaces

Shen, Xiaobin; Tan, Yundan; Yu, Rendong; Liu, Xiaochuan; Lin, Guiping; Xu, Zhiqiang; Guo, Yuandong

doi:10.1155/2021/2698028

Cited by 3 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerical simulation of the icing process on a rotating spinner is complicated, and is affected by droplet impact [20], the flowing film [21], and thermodynamics of icing [22]. Distinguishing the influence of these factors on the icing process is important in understand the principles of engine icing.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spinner Shape on Droplet Impact over Rotating Spinners

et al. 2023

View full text Add to dashboard Cite

Droplet impact affects water collection, which is the key to investigating the icing process on an aero-engine spinner. Different from a stationary spinner, droplet impact is affected by Coriolis acceleration and centrifugal acceleration on rotating aero-engine spinners, showing different impact dynamics. Based on the Eulerian method, using the rotating coordinate system we numerically investigated droplet impact characteristics on three different shapes of aero-engine spinners using ANSYS Fluent. The results indicate that the impact area covered all the windward surface on the conical spinner, and only covered the windward surface prior to the impingement limit of the elliptical spinner and the coniptical spinner. The sensitivity of water collection to inflow velocity declined in the order of coniptical the spinner, the elliptical spinner, and the conical spinner. In addition, the elliptical region could effectively improve aerodynamic performance, as shown in a lower total pressure loss through the spinner. This work is relevant to the anti-icing system of a rotating aero-engine spinner.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of Spinner Shape on Droplet Impact over Rotating Spinners

et al. 2023

View full text Add to dashboard Cite

show abstract

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

Shen,

Xiao,

Ning

et al. 2024

Aerospace

View full text Add to dashboard Cite

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.

show abstract

Analysis of Numerical Methods for Droplet Impingement Characteristics under Aircraft Icing Conditions

Shen

Zhao

et al. 2022

Aerospace

View full text Add to dashboard Cite

The investigation of super-cooled droplet impingement characteristics is the most important step for aircraft icing and anti-icing/de-icing analyses. The Lagrangian method and the Eulerian method are widely used to compute the droplet motion and collection efficiency, and the two methods are considered to obtain almost the same results for surface impingement characteristics under icing conditions. The models and implementation approaches of the two methods were established in this work, and the simulations of droplet motion were carried out for a NACA 0012 airfoil, a 2D section of an A320 head, a multi-element airfoil, and an icing wind tunnel. The collection efficiencies of the NACA 0012 airfoil obtained by the present Lagrangian and Eulerian methods show good agreement with the results in the literature, validating the established methods. The droplet impingement characteristics of the two methods are consistent for the aircraft surfaces without upstream trajectory deflections. However, when the droplet motion is deflected by the frontal body before hitting the rear surfaces, the results obtained by the two methods are different whether the droplet trajectories intersect or not, which subverts the traditional opinion that the Lagrangian and Eulerian methods would obtain the same result of the droplet impingement characteristics. The reason is studied in detail according to the droplet motion results in the icing wind tunnel. The findings of this work are helpful for the accuracy of aircraft icing and anti-icing/de-icing simulations, and useful for the development of airworthiness certification.

show abstract

Effects of Upstream Component and Air Injection on Water Droplet Impingement Characteristics for Downstream Surfaces

Cited by 3 publications

References 19 publications

Influence of Spinner Shape on Droplet Impact over Rotating Spinners

Influence of Spinner Shape on Droplet Impact over Rotating Spinners

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

Analysis of Numerical Methods for Droplet Impingement Characteristics under Aircraft Icing Conditions

Contact Info

Product

Resources

About