Numerical Simulation Of Wing Icing And Its Application In Civil Aviation

Ice accretion on aircraft wings is a hazard phenomenon which leads to reduced lift, increased drag, decreased stall angle of attack and degradation in operation and stability. Some ice accretion has a bad influence on flight safety and economy, and some will lead to air crash and casualties. Research on wings icing is significantly meaningful.In this paper, influence of ice accretion on aerodynamics of aircraft wings in super-cooled large droplet(SLD)conditions was numerically simulated, and a new method of defining icing intensity was proposed based on results got from simulation process. By collecting and reorganizing papers and research reports, it is pointed out that study on ice accretion on wings is significantly meaningful because of its influence on flight safety and economy, and the development need of aeronautical industry in China. Newly advancement of three methods studying ice accretion on wings (i.e. flight tests, icing wind tunnel tests and numerical simulation) and research results got from numerical simulation method in recent years at home and abroad were summarized. By reviewing past research, it is found that ice accretion formed under SLD condition was rather hazardous. And then physical model was established and problem was solved using software FLUENT, including two cases, that is iced wing and no iced wing. At last, this paper comprehensively analyzed unfavorable counter measures taken in civil aviation operation. As there exist shortcomings in current icing intensity definition, a new defining method based on effects of ice on aerodynamic degradation was presented. As an example, horn-glaze icing intensity on NACA23012 airfoil was divided into three categories (i.e. extremely severe, severs and trace) according to its influence on maximum lift coefficient of the airfoil.Results shown that the influence of ice accretion formed in SLD conditions on aerodynamics of aircraft wings can be numerically simulated well using FLUENT, because data calculated using FLUENT are in good agreement with those got form wind tunnel tests. Ice accretion formed in super-cooled large droplet conditions has very bad affects on wing aerodynamics. Disadvantages in the definition of current icing intensity report exist, and can be improved based on the various influence degrees of ice on wing aerodynamics.