Comparison of Aerodynamic Effects Promoted by Mechanical and Fluidic Miniflaps on an Airfoil NACA 4412

Casper, Marcus; Scholz, Peter; Colman, J.; Leo, Julio Marañón Di; Delnero, S.; Camocardi, Mauricio Ezequiel

doi:10.5772/39166

Cited by 1 publication

(1 citation statement)

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“…In the near wake of a wing airfoil provided with Gurney mini-flaps, in lift conditions, the starting vortices detached from the upper surface must show a different intensity than those detached from the lower surface. This asymmetry assures the mean deviation of the flow associated the lift increment provoked by those mini-flaps (Giguerè et al, 1995;Casper et al, 2012). The existence of the counter-rotating asymmetric vortices, in the near wake of an airfoil provided with trailing edge Gurney mini-flaps, was experimentally demonstrated.…”

Section: Introductionmentioning

confidence: 90%

Experimental Study of the Effect of the Wake Generated by Oscillating Gurney Flap

Leo¹,

MartÃnez²,

Delnero³

et al. 2019

LAAR

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The study of the turbulent near wake of an airfoil provided with flow control devices shows the flow configuration in such conditions and the starting vortices mechanism, while, the far wake offers information about the general performance of the model. The objective of the present work is to study the develop of the fluid-dynamic structures found in the NACA 4412 airfoil wake, as well as the development of the same structures when flow con-trol techniques are applied by means of a oscillating Gurney Flap place in the lower surface of the wing model, close to the trailing edge. Tests were per-formed at a given Reynolds numbers and the flow control system was set at different frequencies. In order to study the effect of the control mechanism on the wake, hot wire anemometry techniques were used. Two components of the velocity vector were measured - longitudinal and vertical - by means of a vertical array of three sensors acquiring simulta-neously. The intention is to quantify the flow general configuration at the airfoil wake for different test conditions. The velocity vectors will be analyzed, together with the turbulence intensity and integral scales.

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Section: Introductionmentioning

confidence: 90%