Given the importance of understanding new FAR25, Appendix O certification, supercooled large droplet icing characteristics and its damages should be specified because of its serious hazard to in-flight safety and aircraft engineering. This study compares the icing feature and aerodynamic degradation of high-lift devices under different diameter conditions using a verified numerical method SJTUICE (a ice accretion simulating code by Shanghai Jiao Tong Univeristy). With two different flow and freezing time-steps Tf and Ts, the accuracies on fluid dynamic and icing predictions over a long period of time can be both controlled within an acceptable range. The comparisons between supercooled large droplet and non-supercooled large droplet conditions reflect that larger diameters induce more intense icing characteristics on the suction-side of each airfoil, in which the leading edge of flap is the most sensitive one to drop size. The second-accelerated flow near the gap is adverse to smaller droplet collection but benefit for impact thermodynamic enhancement of those larger collected droplets. The ice-caused gap narrowing makes flow separation earlier, which finally leads to the degradation of global high-lift performance worsen. Lift coefficient comparison also indicates the performance of high-lift devices decays more quickly under supercooled large droplet conditions. Results of this paper highlight the supercooled large droplet icing effects with respect to smaller diameter conditions.


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    Title :

    Supercooled large droplet icing accretion and its unsteady aerodynamic characteristics on high-lift devices


    Contributors:
    Zhang, Chen (author) / Liu, Hong (author) / Wang, Fuxin (author) / Kong, Weiliang (author)


    Publication date :

    2018-08-01


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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