Investigation of skin porosity damping effects on free stream disturbance induced unsteady wing loads

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Journal titleAeronautical Journal
Pages10411060; # of pages: 20
SubjectCylinder wake; Damping effect; Discrete vortices; Disturbance level; Flat plate; Flow configurations; Free stream; Leading edge; Lift coefficient; Shedding vortex; Steady-state flows; Unsteady effects; Unsteady reynolds-averaged navier-stokes; Wing load; Circular cylinders; Damping; Flow simulation; Lift; Porosity; Wakes; Vortex flow
AbstractNumerical simulations were performed to analyse the possibility of damping abrupt incoming free stream disturbances upon a porous aerofoil using an unsteady Reynolds-averaged Navier-Stokes (URANS) model. To mimic the turbulence disturbance levels that are typically encountered in the atmosphere, two flow configurations were considered. In the first configuration, the unsteadiness of the flow was created with vortices shed from a circular cylinder installed ahead of a WTEA-TE1 aerofoil. The continuous von Kármán shedding vortices contained within the cylinder wake were convected downstream and projected upon the aerofoil. In the second configuration, an instantaneous pair of discrete vortices was created by a rotational snapping of a flat plate, installed upstream of the aerofoil. Solid and porous aerofoil configurations, with porosity settings of 11 and 22%, were applied on 50% of the chord of the aerofoil starting from the leading edge. Both steady and unsteady flow simulations were performed to assess the performance of the porosity under steady and unsteady effects. The steady state flow simulations revealed a noticeable reduction in the aerofoil lift coefficient for the porous aerofoil. For unsteady solutions with a continuous or distinct series of vortices interacting with the aerofoil, the porosity showed insignificant damping of the lift coefficient amplitude. The porosity values investigated in the current exercise had indiscernible effect upon the unsteady lift-load alleviations caused by free stream disturbances.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269376
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Record identifier5025c2be-efdf-40ac-940f-f7e80592c090
Record created2013-12-12
Record modified2016-05-09
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