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http://dx.doi.org/10.5139/JKSAS.2020.48.1.23

Implementation of Roughness-Induced Turbulent Transition Model on Inflight Icing Code  

Min, Seungin (Department of Mechanical Aerospace Engineering, Seoul National University)
Yee, Kwanjung (Department of Mechanical Aerospace Engineering, Seoul National University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.48, no.1, 2020 , pp. 23-33 More about this Journal
Abstract
In this study, the effect of surface roughness distribution and its influence on the inflight icing code was investigated. Previous numerical studies focused on the magnitude of surface roughness, and the effects were only addressed in terms of changes in thermal boundary layers with fully turbulent assumption. In addition, the empirical formula was used to take account the turbulent transition due to surface roughness, which was regarded as reducing the accuracy of ice shape prediction. Therefore, in this study, the turbulent transition model based on the two-equation turbulence model was applied to consider the effects of surface roughness. In order to consider the effect of surface roughness, the transport equation for roughness amplification parameter was applied, and the surface roughness distribution model was implemented to consider the physical properties. For validation, the surface roughness, convective heat transfer coefficient, and ice shape were compared with experimental results and other numerical methodology. As a result, it was confirmed that the excessive prediction of the heat transfer coefficient at the leading edge and the ice horn shape at the bottom of the airfoil were improved accordingly.
Keywords
Aircraft Icing; Surface Roughness; Convective Heat Transfer; Turbulent Transition;
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