A review of numerical and experimental studies of the anti-fairing

Conference paper (2020)

Authors

Z. Belligoli Aerodynamics - Aerospace Engineering
R.P. Dwight Aerodynamics - Aerospace Engineering
G. Eitelberg Flight Performance and Propulsion - Aerospace Engineering
S.K. Raghunathan Srikumar Wind Energy - Aerospace Engineering
D. Engler Faleiros Transport Engineering and Logistics - Mechanical, Maritime and Materials Engineering
M. van Nesselrooij Aerodynamics - Aerospace Engineering
O.W.G. van Campenhout Aerodynamics - Aerospace Engineering
Research Group
Aerodynamics (Aerospace Engineering) (TU Delft)
Copyright: © 2020 Z. Belligoli, R.P. Dwight, G. Eitelberg, S.K. Raghunathan Srikumar, D. Engler Faleiros, M. van Nesselrooij, O.W.G. van Campenhout
DOI: https://doi.org/10.2514/6.2020-2703
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Published Date

2020

Language

English

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Faculty

Aerospace Engineering

Department

Flow Physics and Technology

Research Group

Aerodynamics

Abstract

An anti-fairing is a concave deformation of the wall around a wing-body junction that can decrease the aerodynamic drag through the activation of a propulsive force generated by the interaction of the curved concave shape and the high-pressure region in proximity of the wing leading-edge. Although this mechanism is well understood, the dynamics of the interaction between the anti-fairing and the junction flow remain largely unexplored. This work brings together all the numerical and experimental studies of the anti-fairing to investigate its effect on turbulent quantities and the robustness of its design to changes to the incoming flow parameters, and to estimate the drag change with respect to a normal wing/flat-plate configuration. It is found that the interaction of the streamwise pressure gradient generated by the anti-fairing with the incoming boundary layer substantially reduces the shear responsible for viscous drag. Furthermore, no significant influence of the incoming boundary layer thickness on the anti-fairing performance is observed. However, a direct drag measurement with a force balance casts some doubts on the possibility to achieve large drag reductions.

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