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Correction of Local Collection Efficiency Based on Roughness Element Concept for Glaze Ice Simulation

Published online by Cambridge University Press:  06 August 2020

Taekeun Yoon Open the ORCID record for Taekeun Yoon [Opens in a new window]  and
Kwanjung Yee
Taekeun Yoon
Affiliation:
Department of Mechanical & Aerospace Engineering Seoul National UniversitySeoul 08826, Republic of Korea
Kwanjung Yee*
Affiliation:
Department of Mechanical & Aerospace Engineering Seoul National UniversitySeoul 08826, Republic of Korea
*
*Corresponding author ([email protected])
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Abstract

In glaze ice conditions, beads on the surface usually grow to form roughness elements through coalescence, finally resulting in enhancement of local collection efficiency. However, the effects of roughness elements due to freezing of beads are not reflected on the local collection efficiency in CFD icing simulations. This is problematic for predicting the resultant ice shape, which may lead to inaccurate aerodynamic performance and load distribution. The aim of this study is to propose a macroscopic icing model which can reflect bead microscopic phenomena using the Eulerian approach. To this end, a correction was made for collection efficiency by introducing a novel parameter - the effective impinging angle- which is the angle to calculate the local collection efficiency depending on the physical state of surface. It is assumed that the parameter related to the contact angle represents the state of beads. The computational icing analysis of airfoil was performed using the proposed model both in the rime condition and glaze conditions. The results show that the icing characteristics in the feather region is captured with enhanced accuracy in both conditions.

Keywords

Ice accretionEulerian approachLocal collection efficiencyFeather region
Type
Research Article
Information
Journal of Mechanics , Volume 36 , Issue 5 , October 2020 , pp. 607 - 622
Copyright
Copyright © 2020 The Society of Theoretical and Applied Mechanics

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