Optimisation of a novel trailing edge concept for a high lift device
Date
2015-05-14
Authors
Botha, Jason Daniel Michael
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Abstract
This research aims to improve aerodynamic performance of a high lift system by means of implementing
a novel concept (referred to as the
ap extension) on the leading edge of the
ap of
a three element high lift device. The concept is optimised using two optimisation approaches
based on Genetic Algorithm optimisations. A zero order approach which makes simplifying
assumptions to achieve an optimised solution: and a direct approach which employs an optimisation
in ANSYS DesignXplorer using RANS calculations. The concept was seen to increase lift
locally at the
ap. The solution to the zero order optimisation showed a decreased stall angle
and decreased maximum lift coe cient due to early stall onset at the
ap. The DesignXplorer
optimised solution matched that of the baseline solution very closely. Computational Aeroacoustic
simulations were performed using the DES model in 2D on the baseline and DesignXplorer
optimised solution. The DesignXplorer optimised concept steadied the shear layer that bounds
the spoiler cove thus reducing noise from this vicinity by 10dB at frequencies over 7 000Hz.