Please use this identifier to cite or link to this item: http://repository.elizadeuniversity.edu.ng/jspui/handle/20.500.12398/1144
Title: DELAY OF CATASTROPHIC BOUNDARY LAYER SEPARATION OVER NACA 23012 AIRFOIL; A NUMERICAL STUDY
Authors: Julius, M.O.
Alonge, O. I.
Keywords: flow control,
jet width,
lift to drag ratio,
suction,
boundary layer separation,
turbulent flow.
Issue Date: 2019
Publisher: 1st International Conference on Engineering and Environmental Sciences, Osun State University.
Abstract: Flow separation is caused by the action of the combined effect of the adverse pressure gradient and viscous force on the surface of the aeroplane wing and these lead to enormous loss of energy. Consequently, the aerodynamic performance is adversely affected (i.e. there is lift reduction and drag enhancement) and may lead to a catastrophe which put the safety of the aeroplane and the lives on it in danger. The introduction of suction slots, flaps, sophisticated high lifting devices to control the flow through separation delay can mitigate the aerodynamic losses. Therefore, this paper focuses on using a perpendicular suction to control the boundary layer separation of flow over the NACA 23012 aerofoil in order to stem the stalling effect that may lead to fatality. This was achieved by careful design and optimisation of the suction positions, suction jet amplitudes and other geometric parameters. The Reynolds Average Navier-Stokes (RANS) equations were employed together with the Menter’s shear stress turbulent model. The jet with of 2.5% of the chord length was placed at different position varied from 10% to 70% of the chord length; the jet velocity was varied from 0.1 to 0.3 of the free stream velocity. The result of this study demonstrated that when the jet position is moved towards the trailing edge the lift to drag ratio decreases. Also, as the jet amplitude was increased, the lift to drag ratio increased commensurately. The jet position of 0.2c and jet amplitude of 0.3 is the most effective to improve the lift to drag ratio when compared to the NACA 23012 without suction. So the point of separation is delayed and the lift is increased significantly.
Description: Staff Publication
URI: http://repository.elizadeuniversity.edu.ng/jspui/handle/20.500.12398/1144
Appears in Collections:Research Articles

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