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Effects of Gurney Flap on Supercritical and Natural Laminar Flow Transonic Aerofoil Performance

Yu, Ho Chun Raybin (2015) Effects of Gurney Flap on Supercritical and Natural Laminar Flow Transonic Aerofoil Performance. MPhil thesis, University of Sheffield.

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Abstract

The aerodynamic effect of a novel combination of a Gurney flap and shockbump on RAE2822 supercritical aerofoil and RAE5243 Natural Laminar Flow (NLF) aerofoil is investigated by solving the two-dimensional steady Reynolds-averaged Navier-Stokes (RANS) equation. The shockbump geometry is predetermined and pre-optimised on a specific designed condition. This study investigated Gurney flap height range from 0.1% to 0.7% aerofoil chord length. The drag benefits of camber modification against a retrofit Gurney flap was also investigated. The results indicate that a Gurney flap has the ability to move shock downstream on both types of aerofoil. A significant lift-to-drag improvement is shown on the RAE2822, however, no improvement is illustrated on the RAE5243 NLF. The results suggest that a Gurney flap may lead to drag reduction in high lift regions, thus, increasing the lift-to-drag ratio before stall.

Item Type: Thesis (MPhil)
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Mechanical Engineering (Sheffield)
Depositing User: Mr Ho Chun Raybin Yu
Date Deposited: 22 Sep 2015 13:05
Last Modified: 22 Sep 2015 13:05
URI: http://etheses.whiterose.ac.uk/id/eprint/10013

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