Numerical Investigation of Breakup Law and Scaling Criterion of Supercooled Large Droplet

Wei Jia ； Xiao Ze Bai ； Qing Ping Li ； Yuan Hao Gu ； Feng Zhang

《Journal of Aeronautics, Astronautics and Aviation》 55卷1期 Vol.55 No.1 (2023/03) Pp. 77-89

https://doi.org/10.6125/JoAAA.202303_55(1).07

摘要

Abnormal icing caused by the supercooled large droplet (SLD) seriously endangers the flight safety. Due to the larger size of SLD, droplet breakage usually occurs during the motion of SLD. To investigate the breakup law of SLD, the motion of SLD in the wind tunnel was simulated. Results indicated that relative velocity and droplet diameter are two important factors affecting the droplet breakage. The droplet with larger diameter is more prone to break up while the droplet with larger relative velocity is generally broken at the upstream of the wind tunnel. When the peak We number at the stable section is greater than 12.49, the bagged breakup occurs in the stable section. When the peak We number at the contraction section is greater than 4.38, the oscillatory breakup occurs in the contraction section. A new scaling criterion B-criterion considering the SLD breakage was proposed. Combined the Ruff method with scaling criterion, it can be found that the comprehensive quantitative index of B+Ruff method is 13.6% and 7.3% lower than that of π_b+Ruff method and We_d+Ruff method, respectively.

關鍵字

Supercooled large droplet ； Droplet breakage ； Relative velocity ； Droplet diameter ； Scaling criterion