A modified spongy icing model considering the effect of droplets retention on the ice accretion process

摘要

Icing models have been widely used for the prediction of ice accretion process on an aircraft surface. This paper proposes a modified spongy icing model considering the influence of droplets retention on the ice accretion process. In theoretical derivation, the Euler-Lagrange method is employed to calculate the air flow field and droplets motion around the airfoil. The modified model combined with the preceding solutions is then applied to compute the critical size of the water film and droplets on the ice surface to finally obtain the ice accretion morphology. In numerical simulation, a NACA0012 airfoil is taken as an example for verification of the modified model via comparing the results with those based on other models as well as experiments. The results indicate that the modified model has a better agreement with the experiment on the ice accretion morphology distribution than the existing icing models when there is liquid water in ice at not much low air temperature, demonstrating the necessary consideration of droplets retention on the ice surface when numerically simulating glaze ice accretion. The modified spongy icing model would contribute to a better prediction of the ice accretion morphology distribution on an airfoil.