Numerical Simulation Icing On Airfoils And Analysis Of Its Aerodynamic Characteristics

When flying in icing weather conditions, the areas of aircrafts prone to ice accretion are: airfoil,tail, propeller blade, leading edge of engine inlet, windshield, pitot, antenna and so on. The maineffect of wing icing is to change the aircraft’s aerodynamic shape, and affect its aerodynamiccharacteristics, which is a serious threat to flight safety. So research of icing on airfoils has been aimportant part in aircraft design, and the wing icing research has always been the world’s attention. Tostudy the impacts of the shape changes on the aerodynamic characteristics of the wings, first of all thewater droplets impinged should be studied, as well as the mechanism and the process of freezing onthe wing surface, that is, the growth of the ice and the ice shape after a certain period of time.The main research of this paper includes:1. Reviewing and summarizing the basic concept ofice accretion, ice hazards, modern anti/deicing technology and the necessity for ice studies;2. Thispaper uses N-S equation to compute the air flow when icing, selects S-A aircraft icing research modelin turbulence models, establishes two-phase flow of air and super-cooled water droplets equations,determines the droplet trajectories, gets water droplets impinge regions and the local water dropletscollection coefficient on the icing surface, determines the characteristics of droplet, and considers theicing model combining with shallow water theory basis for Messiger model;3. This paper analyzesthe collision characteristics of super-cooled large droplets in theroy and proposes reasonablehypothesis to improve the original general super-cooled water droplets model. Comparison with theresults of calculation and trial data on literatures to verify the effectiveness of the proposed method;4.This paper compares the calculated results with experimental results, and discusses the affect of theflight and weather condition parameters on the ice shape; and discusses the influence of wing icing onthe aerodynamic performance;5. Finally, this paper makes prospects on anti-deicing methods bynumerical simulation.